7Baggers

Boston Properties, Inc
(NYSE:BXP) 

BXP stock logo

Boston Properties (NYSE:BXP) is the largest publicly-held developer and owner of Class A office properties in the United States, concentrated in five markets - Boston, Los Angeles, New York, San Francisco and Washington, DC. The Company is a fully integrated real estate company, organized as a real ...

Founded: 1970
Full Time Employees: 760
Sector: Real Estate
Industry: REIT-Office

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Quarterly
Annual
    Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 
                                                                                
      revenue
                                                                                
      lease
    809,150,000 809,820,000 805,935,000 811,102,000 798,189,000 799,471,000 790,555,000 788,590,000 768,884,000 767,181,000 761,733,000 756,875,000 739,094,000 739,255,000 721,899,000 718,120,000 690,912,000 692,260,000 684,025,000 685,817,000 639,357,000 666,674,000 630,119,000 710,111,000 706,349,000 692,225,000 680,189,000 679,251,000                                                 
      parking and other
    42,883,000 35,390,000 34,799,000 30,242,000 34,056,000 34,255,000 34,615,000 32,216,000 31,497,000 30,428,000 26,984,000 24,009,000 26,991,000 28,154,000 30,346,000 21,734,000 23,087,000 23,507,000 18,282,000 16,938,000 15,903,000 16,327,000 13,946,000 24,504,000 26,727,000 25,582,000 26,319,000 24,906,000 27,831,000 26,552,000 26,904,000 26,134,000 26,836,000 26,092,000 26,462,000 25,610,000 24,638,000 26,113,000 24,825,000 25,132,000 25,509,000 26,552,000 24,788,000 25,724,000 26,236,000 26,300,000 24,333,000 24,533,000 25,246,000 23,969,000 23,830,000 22,614,000 23,070,000 23,524,000 22,428,000 21,234,000 21,694,000 21,101,000 19,068,000 16,920,000 15,850,000 16,423,000 15,297,000 15,357,000 15,883,000 18,416,000 16,941,000 17,663,000 16,624,000 17,317,000 16,501,000 16,845,000 16,328,000 16,488,000 15,321,000  
      hotel
    12,464,000 13,162,000 14,773,000 9,597,000 13,144,000 15,082,000 14,812,000 8,186,000 11,803,000 13,484,000 13,969,000 8,101,000 11,087,000 11,749,000 12,089,000 4,557,000 6,227,000 5,189,000 1,561,000 632,000 464,000 90,000 99,000 6,825,000 8,318,000 8,743,000 9,080,000 7,863,000 8,221,000 8,828,000 8,741,000 8,073,000 8,117,000 8,447,000 8,404,000 7,091,000 8,118,000 7,978,000 7,634,000 7,888,000 8,125,000 8,495,000 7,576,000 7,539,000 7,585,000 7,315,000 6,797,000 7,488,000 6,580,000 7,335,000 7,044,000 8,519,000 6,886,000 6,616,000 6,099,000 8,076,000 6,032,000 6,281,000 5,739,000 7,602,000 6,194,000 6,089,000 5,268,000 7,717,000 5,418,000 5,359,000 5,472,000 8,846,000 6,318,000 6,449,000 5,897,000 9,059,000 6,275,000 6,417,000 6,014,000  
      development and management services
    8,641,000 9,317,000 8,846,000 9,775,000 8,784,000 6,770,000 6,352,000 6,154,000 12,728,000 9,284,000 9,858,000 8,980,000 8,406,000 7,465,000 6,354,000 5,831,000 7,516,000 6,094,000 7,284,000 6,803,000 6,356,000 7,281,000 8,125,000 7,879,000 10,473,000 10,303,000 9,986,000 9,277,000 12,195,000 15,253,000 9,305,000 8,405,000 9,957,000 10,811,000 7,365,000 6,472,000 6,364,000 5,533,000 6,689,000 6,452,000 5,912,000 4,862,000 5,328,000 7,119,000 6,475,000 6,506,000 5,216,000 7,623,000 5,479,000 7,857,000 8,736,000 8,343,000 8,024,000 9,564,000 8,149,000 8,729,000 8,180,000 9,098,000 7,428,000 6,964,000 6,439,000 18,884,000 8,944,000 8,277,000 9,754,000 8,551,000 8,296,000 9,024,000 9,557,000 6,460,000 5,477,000 5,378,000 5,318,000 5,130,000 4,727,000  
      direct reimbursements of payroll and related costs from management services contracts
    3,959,000 3,821,000 4,104,000 4,499,000 4,398,000 3,649,000 4,148,000 4,293,000 4,021,000 3,906,000 4,609,000 5,235,000 4,246,000 3,900,000 3,239,000 4,065,000 3,321,000 3,006,000 2,655,000 3,505,000 3,009,000 2,896,000 2,484,000 3,237,000 2,159,000 2,429,000 2,403,000 3,395,000 2,219,000 2,516,000 1,970,000 2,885,000                                             
      total revenue
    877,097,000 871,510,000 868,457,000 865,215,000 858,571,000 859,227,000 850,482,000 839,439,000 828,933,000 824,283,000 817,153,000 803,200,000 789,824,000 790,523,000 773,927,000 754,307,000 731,063,000 730,056,000 713,807,000 713,695,000 665,089,000 693,268,000 654,773,000 752,556,000 757,501,000 743,553,000 733,741,000 725,767,000 705,157,000 686,284,000 664,484,000 661,151,000 655,229,000 657,712,000 656,907,000 632,228,000 625,228,000 623,546,000 665,985,000 624,240,000 629,884,000 618,221,000 618,476,000 613,707,000 618,803,000 589,794,000 574,694,000 568,705,000 574,082,000 515,320,000 483,014,000 487,239,000 470,904,000 472,897,000 447,662,000 452,787,000 452,413,000 436,451,000 417,875,000 386,841,000 388,224,000 395,958,000 379,781,000 377,912,000 377,303,000 389,490,000 377,544,000 392,273,000 357,048,000 368,520,000 370,559,000 371,959,000 371,507,000 375,128,000 363,695,000  
      yoy
    2.16% 1.43% 2.11% 3.07% 3.58% 4.24% 4.08% 4.51% 4.95% 4.27% 5.59% 6.48% 8.04% 8.28% 8.42% 5.69% 9.92% 5.31% 9.02% -5.16% -12.20% -6.76% -10.76% 3.69% 7.42% 8.34% 10.42% 9.77% 7.62% 4.34% 1.15% 4.57% 4.80% 5.48% -1.36% 1.28% -0.74% 0.86% 7.68% 1.72% 1.79% 4.82% 7.62% 7.91% 7.79% 14.45% 18.98% 16.72% 21.91% 8.97% 7.90% 7.61% 4.09% 8.35% 7.13% 17.05% 16.53% 10.23% 10.03% 2.36% 2.89% 1.66% 0.59% -3.66% 5.67% 5.69% 1.88% 5.46% -3.89% -1.76% 1.89%      
      qoq
    0.64% 0.35% 0.37% 0.77% -0.08% 1.03% 1.32% 1.27% 0.56% 0.87% 1.74% 1.69% -0.09% 2.14% 2.60% 3.18% 0.14% 2.28% 0.02% 7.31% -4.06% 5.88% -12.99% -0.65% 1.88% 1.34% 1.10% 2.92% 2.75% 3.28% 0.50% 0.90% -0.38% 0.12% 3.90% 1.12% 0.27% -6.37% 6.69% -0.90% 1.89% -0.04% 0.78% -0.82% 4.92% 2.63% 1.05% -0.94% 11.40% 6.69% -0.87% 3.47% -0.42% 5.64% -1.13% 0.08% 3.66% 4.45% 8.02% -0.36% -1.95% 4.26% 0.49% 0.16% -3.13% 3.16% -3.75% 9.87% -3.11% -0.55% -0.38% 0.12% -0.97% 3.14%   
      expenses
                                                                                
      operating
                                                                                
      rental
    339,693,000 331,736,000 332,062,000 331,578,000 323,358,000 327,897,000 321,426,000 314,157,000 301,411,000 300,192,000 291,036,000 291,308,000 282,265,000 281,702,000 273,848,000 270,255,000 256,778,000 258,281,000 248,703,000 257,389,000 256,194,000 258,261,000 239,787,000 262,966,000 268,919,000 265,603,000 257,971,000 257,517,000 253,043,000 247,989,000 237,790,000 240,329,000 233,895,000 237,341,000 230,454,000 228,287,000 228,560,000 217,938,000 219,172,000 216,642,000 219,796,000 214,464,000 221,350,000 211,077,000 215,179,000 202,646,000 206,388,000 195,744,000 200,350,000 179,837,000 172,620,000 170,125,000 168,939,000 161,853,000 157,506,000 154,146,000 154,985,000 144,875,000 139,971,000 125,384,000 128,041,000 123,284,000 124,985,000 124,188,000 129,020,000 124,730,000 123,861,000 123,479,000 127,715,000 119,103,000 117,733,000 114,501,000 114,140,000 113,624,000 113,575,000  
      general and administrative
    37,801,000 36,188,000 42,516,000 52,284,000 32,504,000 33,352,000 44,109,000 50,018,000 38,771,000 31,410,000 44,175,000 55,802,000 36,000,000 32,519,000 34,665,000 43,194,000 33,649,000 34,560,000 38,405,000 44,959,000 31,053,000 27,862,000 37,743,000 36,454,000 32,797,000 31,147,000 35,071,000 41,762,000 27,683,000 29,677,000 28,468,000 35,894,000 29,396,000 25,792,000 27,141,000 31,386,000 25,165,000 25,418,000 29,353,000 24,300,000 20,944,000 22,284,000 28,791,000 23,172,000 22,589,000 23,271,000 29,905,000 20,656,000 24,841,000 22,194,000 43,571,000 15,940,000 19,757,000 19,066,000 27,619,000 19,390,000 17,340,000 20,069,000 24,643,000 17,121,000 18,067,000 17,648,000 26,822,000 19,506,000 19,989,000 18,532,000 17,420,000 16,552,000 18,758,000 17,467,000 19,588,000 16,594,000 20,189,000 16,291,000 16,808,000  
      payroll and related costs from management services contracts
    3,959,000 3,821,000 4,104,000 4,499,000 4,398,000 3,649,000 4,148,000 4,293,000 4,021,000 3,906,000 4,609,000 5,235,000 4,246,000 3,900,000 3,239,000 4,065,000 3,321,000 3,006,000 2,655,000 3,505,000 3,009,000 2,896,000 2,484,000 3,237,000 2,159,000 2,429,000 2,403,000 3,395,000 2,219,000 2,516,000 1,970,000 2,885,000                                             
      transaction costs
    122,000 1,431,000 357,000 768,000 707,000 188,000 189,000 513,000 2,343,000 751,000 308,000 911,000 759,000 1,650,000 496,000  2,066,000 1,888,000 751,000 331,000 277,000 307,000 332,000 615,000 569,000 538,000 417,000 460,000 195,000 914,000 474,000 21,000 96,000 239,000 299,000 34,000 249,000 913,000 25,000 470,000 254,000 208,000 327,000 640,000 1,402,000 661,000 437,000  766,000 535,000 443,000 401,000 1,140,000 8,000 2,104,000                      
      depreciation and amortization
    232,015,000 236,147,000 223,819,000 220,107,000 226,043,000 222,890,000 219,542,000 218,716,000 212,067,000 207,435,000 202,577,000 208,734,000 198,330,000 190,675,000 183,146,000 177,624,000 177,521,000 179,412,000 183,838,000 176,565,000 168,013,000 166,456,000 178,188,000 171,094,000 169,897,000 165,862,000 177,411,000 164,594,000 165,439,000 157,996,000 156,417,000 165,797,000 154,259,000 152,164,000 151,919,000 159,205,000 203,748,000 153,175,000 159,448,000 164,460,000 153,015,000 167,844,000 154,223,000 162,430,000 157,245,000 154,628,000 154,270,000 151,714,000 154,193,000 134,604,000 120,595,000 121,125,000 111,360,000 111,643,000 109,673,000 109,181,000 109,495,000 111,080,000 109,428,000 92,763,000 81,133,000 81,400,000 83,075,000 79,125,000 78,181,000 87,005,000 77,370,000 79,766,000 75,321,000 74,389,000 74,671,000 69,315,000 71,616,000 74,621,000 70,478,000  
      total expenses
    622,631,000 618,951,000 612,223,000 616,801,000 596,611,000 597,809,000 599,253,000 593,712,000 566,986,000 552,714,000 550,866,000 568,661,000 529,246,000 518,994,000 501,838,000 499,978,000 478,340,000 481,093,000 476,348,000 484,800,000 459,724,000 458,946,000 460,507,000 481,187,000 482,659,000 474,322,000 482,353,000 475,591,000 456,800,000 447,920,000 433,860,000 452,999,000 425,763,000 423,983,000 418,217,000 426,003,000 467,623,000 405,422,000 415,632,000 413,760,000 402,134,000 413,295,000 412,267,000 404,858,000 404,000,000 388,521,000 397,797,000 375,602,000 386,730,000 344,505,000 352,579,000 316,110,000 308,082,000 299,186,000 303,001,000 290,812,000 287,903,000 282,318,000 279,853,000 -50,264,000 331,700,000 331,905,000 326,949,000 318,206,000 308,397,000 313,559,000 331,406,000 311,680,000 302,738,000 281,715,000 289,516,000 277,758,000 284,844,000 284,696,000 281,523,000  
      other income
                                                                                
      income from unconsolidated joint ventures
    -38,448,000 -148,329,000 -3,324,000 -2,139,000 1,594,000 -7,011,000 -5,799,000 19,186,000   -6,668,000 -7,569,000 -347,250 -3,524,000 -54,000 2,189,000   -1,373,000 5,225,000 -79,700,000 -6,873,000 1,832,000 -369,000 -936,000 -649,000 47,964,000 213,000 5,305,000 -4,313,000 769,000 461,000 4,197,000 843,000 3,108,000 3,084,000 1,464,000 2,234,000 1,791,000 2,211,000 2,647,000 3,078,000 14,834,000 2,700,000 4,419,000 2,834,000 2,816,000 2,834,000 14,736,000 48,783,000 8,721,000 6,949,000 9,217,000 21,191,000 11,721,000 57,712,000 11,326,000 8,882,000 7,976,000 9,834,000 11,565,000 7,465,000 7,910,000 962,000 6,350,000 -351,000 5,097,000 -187,559,000 2,644,000 1,855,000 1,042,000 805,000 1,390,000 17,268,000 965,000  
      gains on sales of real estate
    156,410,000 1,932,000   85,000 517,000    517,000   55,726,000 262,345,000 96,247,000 22,701,000 115,556,000 348,000 7,756,000  5,259,000 -209,000 203,767,000 410,165,000 -57,000 -15,000 1,686,000 -905,000 59,804,000 7,863,000 18,292,000 96,397,000 872,000 2,891,000 3,767,000 133,000 12,983,000  67,623,000 81,332,000 199,479,000  95,084,000 126,102,000 41,937,000                 969,000 1,765,000 2,420,500 2,394,000 4,493,000 2,795,000          
      loss on sales-type lease
       -2,490,000                                                                         
      interest and other income
    12,351,000 7,620,000 8,063,000 7,750,000 20,452,000 14,430,000 10,788,000 14,529,000 20,965,000 20,715,000 17,343,000 10,941,000 5,789,000 3,728,000 1,195,000 1,228,000 1,564,000 1,520,000 1,452,000 1,168,000 1,676,000 -45,000 1,305,000 3,017,000 4,393,000 7,178,000 3,615,000 3,753,000 3,774,000 2,822,000 2,579,000 1,648,000 2,336,000 1,329,000 1,504,000 614,000 3,628,000 1,524,000 1,505,000 440,000 3,637,000 1,293,000 1,407,000 1,924,000 3,421,000 2,109,000 1,311,000 1,664,000 3,879,000 1,296,000 1,471,000 2,062,000 4,001,000 2,382,000 1,646,000 1,179,000 1,252,000 1,953,000 974,000                  
      gains from investments in securities
    846,000 2,400,000 2,600,000 -365,000 -369,000 2,198,000 315,000 2,272,000 3,245,000 -925,000 1,571,000 1,665,000 2,096,000 -1,571,000 -4,716,000 -2,262,000 1,882,000 -190,000 2,275,000 1,659,000 4,296,000 1,858,000 4,552,000 -5,445,000 2,177,000 106,000 1,165,000 2,969,000 -3,319,000 1,075,000 505,000 -126,000 962,000 944,000 730,000 1,042,000 976,000 478,000 259,000 493,000 -1,515,000 -24,000 393,000 387,000 -297,000 662,000 286,000 1,039,000 956,000 181,000 735,000 187,000 587,000 -186,000 801,000 38,000 -860,000 6,000 373,000 1,188,000 -731,000                
      unrealized gain on non-real estate investments
    -2,000 178,000 -39,000 -483,000                                                                         
      impairment losses
    -16,902,000 -68,901,000                                                                           
      loss from early extinguishment of debt
       -338,000                                                                         
      interest expense
    -162,612,000 -164,299,000 -162,783,000 -163,444,000 -170,390,000 -163,194,000 -149,642,000 -161,891,000 -155,080,000 -147,812,000 -142,473,000 -134,207,000 -119,923,000 -111,846,000 -104,142,000 -101,228,000 -103,331,000 -105,794,000 -106,319,000 -107,902,000 -111,991,000 -110,993,000 -107,142,000 -101,591,000 -102,880,000 -106,471,000 -102,357,000 -101,009,000 -100,378,000 -95,366,000 -92,204,000 -90,220,000 -91,772,000 -92,032,000 -95,143,000 -95,534,000 -104,641,000 -105,003,000 -105,309,000 -106,178,000 -108,727,000 -108,534,000 -108,757,000 -117,904,000 -113,308,000 -110,977,000 -113,554,000 -121,134,000 -122,173,000 -103,140,000 -100,433,000 -105,396,000 -105,030,000 -99,901,000 -103,237,000 -103,967,000 -95,777,000 -95,236,000 -99,151,000                  
      net income
    294,789,000 -116,840,000 119,141,000 86,905,000 -237,817,000 108,452,000 106,949,000 106,604,000 153,155,000 -103,543,000 136,184,000 105,628,000 155,723,000 420,661,000 267,243,000 176,957,000 223,285,000 139,250,000 141,250,000 128,147,000 24,905,000 118,060,000 298,580,000 577,146,000 176,009,000 141,370,000 203,461,000 131,159,000 185,241,000 150,445,000 160,565,000 216,312,000 132,203,000 147,704,000 167,010,000 115,564,000 71,504,000 117,357,000 216,222,000 166,738,000 323,271,000 100,739,000 209,170,000 211,425,000 150,975,000 95,901,000 67,756,000 106,312,000 170,436,000 506,761,000 57,931,000 57,280,000 66,103,000 134,746,000 74,010,000 115,443,000 80,451,000 69,738,000 48,194,000 -12,756,000 68,089,000 72,487,000 62,507,000 62,746,000 77,650,000 80,073,000 54,030,000          
      yoy
    -223.96% -207.73% 11.40% -18.48% -255.28% -204.74% -21.47% 0.92% -1.65% -124.61% -49.04% -40.31% -30.26% 202.09% 89.20% 38.09% 796.55% 17.95% -52.69% -77.80% -85.85% -16.49% 46.75% 340.04% -4.98% -6.03% 26.72% -39.37% 40.12% 1.86% -3.86% 87.18% 84.89% 25.86% -22.76% -30.69% -77.88% 16.50% 3.37% -21.14% 114.12% 5.04% 208.71% 98.87% -11.42% -81.08% 16.96% 85.60% 157.83% 276.09% -21.73% -50.38% -17.83% 93.22% 53.57% -1005.01% 18.16% -3.79% -22.90% -120.33% -12.31% -9.47% 15.69%              
      qoq
    -352.30% -198.07% 37.09% -136.54% -319.28% 1.41% 0.32% -30.39% -247.91% -176.03% 28.93% -32.17% -62.98% 57.41% 51.02% -20.75% 60.35% -1.42% 10.22% 414.54% -78.90% -60.46% -48.27% 227.91% 24.50% -30.52% 55.13% -29.20% 23.13% -6.30% -25.77% 63.62% -10.49% -11.56% 44.52% 61.62% -39.07% -45.72% 29.68% -48.42% 220.90% -51.84% -1.07% 40.04% 57.43% 41.54% -36.27% -37.62% -66.37% 774.77% 1.14% -13.35% -50.94% 82.06% -35.89% 43.49% 15.36% 44.70% -477.81% -118.73% -6.07% 15.97% -0.38% -19.19% -3.03% 48.20%           
      net income margin %
    33.61% -13.41% 13.72% 10.04% -27.70% 12.62% 12.58% 12.70% 18.48% -12.56% 16.67% 13.15% 19.72% 53.21% 34.53% 23.46% 30.54% 19.07% 19.79% 17.96% 3.74% 17.03% 45.60% 76.69% 23.24% 19.01% 27.73% 18.07% 26.27% 21.92% 24.16% 32.72% 20.18% 22.46% 25.42% 18.28% 11.44% 18.82% 32.47% 26.71% 51.32% 16.29% 33.82% 34.45% 24.40% 16.26% 11.79% 18.69% 29.69% 98.34% 11.99% 11.76% 14.04% 28.49% 16.53% 25.50% 17.78% 15.98% 11.53% -3.30% 17.54% 18.31% 16.46% 16.60% 20.58% 20.56% 14.31% 0% 0% 0% 0% 0% 0% 0% 0%  
      net loss attributable to noncontrolling interests
                                                                                
      noncontrolling interests in property partnerships
    -18,479,000 -17,853,000 -20,100,000 -18,749,000 -17,233,000 -15,237,000 -17,825,000 -17,221,000 -19,324,000 -20,909,000 -19,768,000 -18,660,000 -19,961,000 -18,801,000 -18,546,000 -17,549,000 -18,204,000 -18,971,000 -17,164,000 -16,467,000 -13,980,000 -15,561,000 767,000 -19,486,000 -16,338,000 -18,470,000 -17,482,000 -18,830,000 -16,425,000 -14,850,000 -14,400,000 -17,234,000 -13,865,000 -14,340,000 -15,203,000 -4,424,000 17,225,000 -6,814,000 -10,464,000 -10,143,000 -115,240,000 -9,264,000 -15,208,000 -13,088,000 -5,566,000 -7,553,000 -4,354,000 -2,271,000 3,279,000 219,000 -2,574,000     -440,000 -86,000 -503,000 -529,000 -907,000 -889,000 -864,000 -804,000 -463,000 -1,114,000 -691,000 -510,000          
      noncontrolling interest—common units of the operating partnership
    -27,960,000 12,981,000 -10,064,000 -6,979,000 26,196,000 -9,587,000 -9,509,000 -9,500,000 -13,906,000 12,626,000 -12,117,000 -9,078,000 -13,959,000 -40,883,000 -25,708,000 -16,361,000 -20,538,000 -11,982,000 -12,383,000 -11,084,000 -614,000 -10,020,000 -30,197,000 -57,539,000             -9,387,000 -11,357,000 -21,393,000 -16,045,000 -21,302,000 -9,394,000 -20,188,000 -21,043,000 -14,963,000 -8,883,000 -6,160,000 -6,950,000 -8,399,000 -50,734,000 -4,358,000 -7,653,000 -7,002,000 -10,360,000 -6,089,000 -12,841,000 -8,991,000 -8,179,000 -6,029,000 1,742,000 -8,712,000 -9,250,000 -7,870,000 -7,758,000 -9,662,000 -10,629,000 -7,531,000          
      net income attributable to bxp, inc.
    248,350,000 -121,712,000 88,977,000 61,177,000 -228,854,000 83,628,000 79,615,000                                                                      
      basic earnings per common share attributable to bxp, inc.
                                                                                
      weighted-average number of common shares outstanding
    158,330,000 158,345,000 158,312,000 158,202,000 157,468,000 157,725,000 157,039,000 156,983,000 156,863,000 156,880,000 156,826,000 156,803,000 156,726,000 156,754,000 156,720,000 156,650,000 156,116,000 156,183,000 156,107,000 155,928,000 155,432,000 155,645,000 155,386,000 155,011,000 154,582,000 154,577,000 154,555,000 154,525,000 154,427,000 154,440,000 154,415,000 154,385,000 154,190,000 154,355,000 154,177,000 153,860,000 153,754,000 153,662,000 153,626,000 153,471,000 153,595,000 153,450,000 153,230,000 153,089,000 153,120,000 153,078,000 153,030,000 152,201,000 152,407,000 151,938,000 151,646,000 150,120,000 150,801,000 150,312,000 148,343,000 145,693,000 147,006,000 145,864,000 142,095,000 139,440,000 139,595,000 139,113,000 138,931,000 131,050,000 138,641,000 125,267,000 121,256,000 119,980,000 119,832,000 119,753,000 119,536,000 118,839,000 119,010,000 118,961,000 118,177,000  
      diluted earnings per common share attributable to bxp, inc.
                                                                                
      weighted-average number of common and common equivalent shares outstanding
    158,869,000 158,345,000 158,795,000 158,632,000 157,793,000 158,213,000 157,291,000 157,132,000 157,201,000 156,880,000 157,218,000 157,043,000 157,137,000 157,133,000 157,192,000 157,004,000 156,376,000 156,598,000 156,519,000 156,099,000 155,517,000 155,670,000 155,407,000 155,258,000 154,883,000 154,820,000 154,874,000 154,844,000 154,682,000 154,678,000 154,571,000 154,705,000 154,390,000 154,483,000 154,331,000 154,214,000 154,136,000 153,860,000 153,917,000 153,844,000 153,786,000 153,815,000 153,873,000 153,308,000 153,273,000 153,238,000 153,169,000 152,521,000 152,692,000 152,490,000 151,952,000 150,711,000 151,983,000 150,694,000 148,746,000 146,218,000 147,622,000 146,695,000 142,504,000 140,057,000 140,193,000 139,826,000 139,597,000 131,512,000    121,299,000 121,369,000 121,315,000 121,022,000 120,780,000 120,655,000 120,984,000 120,647,000  
      gain on sale of real estate
      18,390,000                                                                          
      impairment loss
           -13,615,000                 -6,009,500   -24,038,000         1,783,000              8,306,000                          
      net income attributable to noncontrolling interests
                                                                                
      unrealized gain on non-real estate investment
        137,000 94,000 58,000 396,000 -93,000 -51,000 124,000 259,000                                                                 
      net income attributable to boston properties, inc.
           79,883,000 119,925,000 -111,826,000 104,299,000 77,890,000 121,803,000 360,977,000 222,989,000 143,047,000 184,543,000 108,297,000 111,703,000 100,596,000 10,311,000 92,479,000 269,150,000 500,121,000 143,459,000 110,396,000 166,943,000 100,730,000 151,137,000 121,743,000 131,306,000 178,646,000 106,478,000 119,962,000 136,334,000 99,708,000 79,342,000 99,186,000 184,365,000 140,550,000 186,729,000 82,078,000 173,771,000 177,285,000 130,371,000 79,145,000 56,623,000 91,539,000 155,324,000 455,035,000 48,000,000 48,177,000 57,769,000 119,070,000 64,632,000 101,320,000 70,542,000 60,214,000 40,813,000 -12,714,000 57,668,000 61,412,000 52,714,000 53,410,000 65,795,000 67,152,000           
      basic earnings per common share attributable to boston properties, inc.
                                                                                
      diluted earnings per common share attributable to boston properties, inc.
                                                                                
      loss from unconsolidated joint ventures
            22,250,000 -247,556,000       -436,250 -5,597,000                                                           
      other income - assignment fee
                  6,624,000                                                              
      losses from early extinguishment of debt
                    -44,284,000   -898,000                                                         
      preferred dividends
                       -2,560,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,625,000 -2,589,000 -2,589,000 -2,618,000 -2,646,000 -2,647,000 -2,618,000 -2,589,000 -2,646,000 -2,647,000 -2,618,000 -2,589,000 -2,646,000 -2,647,000 -2,618,000 -146,000                          
      preferred stock redemption charge
                       -6,412,000                                                         
      net income attributable to boston properties, inc. common shareholders
                121,803,000 360,977,000 222,989,000 143,047,000 184,543,000 108,297,000 111,703,000 91,624,000 7,686,000 89,854,000 266,525,000 497,496,000 140,834,000 107,771,000 164,318,000 98,105,000 148,512,000 119,118,000 128,681,000 176,021,000 103,853,000 117,337,000 133,709,000 97,083,000 76,753,000 96,597,000 181,747,000 137,904,000 184,082,000 79,460,000 171,182,000 174,639,000 127,724,000 76,527,000 54,034,000 88,893,000 152,677,000 452,417,000 47,854,000                          
      basic earnings per common share attributable to boston properties, inc. common shareholders:
                                                                                
      diluted earnings per common share attributable to boston properties, inc. common shareholders:
                                                                                
      income from early extinguishment of debt
                            -7,002,500 -28,010,000                                                   
      net (income) loss attributable to noncontrolling interests
                                                                                
      base rent
                                541,902,000 525,875,000 516,439,000 519,507,000 511,995,000 513,269,000 520,542,000 503,562,000 489,312,000 493,386,000 536,128,000 493,141,000 494,300,000 486,609,000 490,682,000 484,011,000 484,071,000 463,239,000 455,018,000 446,983,000 451,866,000 403,942,000 377,728,000 384,663,000 370,494,000 372,285,000 357,701,000 358,466,000 360,595,000 348,474,000 339,535,000 312,899,000 310,459,000 305,823,000 302,383,000 295,448,000 291,602,000 304,864,000 293,517,000 300,544,000 266,205,000 281,072,000 281,394,000 270,379,000 270,513,000 270,508,000 272,908,000  
      recoveries from tenants
                                109,265,000 102,424,000 95,259,000 95,118,000 94,697,000 94,476,000 89,163,000 89,164,000 92,560,000 85,706,000 89,586,000 88,576,000 91,544,000 86,795,000 88,593,000 85,946,000 90,103,000 81,382,000 81,934,000 79,297,000 80,839,000 68,434,000 64,429,000 59,928,000 59,957,000 57,475,000 52,568,000 52,726,000 53,899,000 48,874,000 45,896,000 45,189,000 45,646,000 44,340,000 45,544,000 46,769,000 51,901,000 49,821,000 52,408,000 50,032,000 55,968,000 49,848,000 48,884,000 44,804,000 45,621,000 47,462,000 47,042,000  
      hotel revenue
                            11,793,000 13,014,000 14,844,000 8,938,000 11,745,000 13,664,000 14,607,000 9,102,000 11,744,000 13,064,000 13,375,000 7,420,000 12,354,000 12,808,000 8,757,000 10,939,000 12,619,000 13,403,000 9,085,000 10,907,000 11,918,000 12,367,000 8,193,000 10,269,000 10,652,000 11,118,000 8,291,000 11,691,000 9,359,000 10,049,000 6,816,000 11,632,000 8,045,000 8,904,000 5,948,000 10,510,000 8,016,000 8,371,000 5,903,000 10,277,000 6,650,000 7,396,000 6,062,000 12,158,000 8,482,000 9,708,000 6,524,000 13,121,000 8,646,000 9,335,000 6,709,000  
      noncontrolling interest—common units of boston properties limited partnership
                            -10,783,250 -12,504,000 -19,036,000 -11,599,000 -12,282,000 -13,852,000 -14,859,000 -20,432,000 -10,087,500 -13,402,000 -15,473,000 -11,432,000                                         
      total rental revenue
                                678,998,000 654,851,000 638,602,000 640,759,000 633,528,000 633,837,000 636,167,000 618,336,000 606,510,000 605,205,000 650,539,000 606,849,000 611,353,000 599,956,000 604,063,000 595,681,000 600,410,000 570,921,000 561,285,000 550,813,000 557,951,000 496,345,000 465,987,000 467,205,000 453,521,000 453,284,000 432,697,000 432,426,000 436,188,000 418,449,000 404,499,000 375,008,000 371,955,000 366,586,000 363,224,000 357,574,000 359,386,000 373,101,000 362,866,000 368,239,000 338,797,000 348,237,000 346,779,000 332,028,000 332,462,000 334,458,000 335,271,000  
      operating income
                                169,285,000 238,364,000 230,624,000 208,152,000 229,466,000 233,729,000 238,690,000 206,225,000 157,605,000 218,124,000 250,353,000 210,480,000 227,750,000 204,926,000 206,209,000 208,849,000 214,803,000 201,273,000 176,897,000 193,103,000 187,352,000 170,815,000 130,435,000 171,129,000 162,822,000 173,711,000 144,661,000 161,975,000 164,510,000 154,133,000 138,022,000                  
      yoy
                                -26.23% 1.98% -3.38% 0.93% 45.60% 7.15% -4.66% -2.02% -30.80% 6.44% 21.41% 0.78% 6.03% 1.81% 16.57% 8.15% 14.65% 17.83% 35.62% 12.84% 15.07% -1.67% -9.83% 5.65% -1.03% 12.70% 4.81%                      
      qoq
                                -28.98% 3.36% 10.80% -9.29% -1.82% -2.08% 15.74% 30.85% -27.75% -12.87% 18.94% -7.58% 11.14% -0.62% -1.26% -2.77% 6.72% 13.78% -8.39% 3.07% 9.68% 30.96% -23.78% 5.10% -6.27% 20.08% -10.69% -1.54% 6.73% 11.67%                   
      operating margin %
    0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 24.01% 34.73% 34.71% 31.48% 35.02% 35.54% 36.34% 32.62% 25.21% 34.98% 37.59% 33.72% 36.16% 33.15% 33.34% 34.03% 34.71% 34.13% 30.78% 33.95% 32.64% 33.15% 27.00% 35.12% 34.58% 36.73% 32.31% 35.77% 36.36% 35.32% 33.03% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%  
      gains from early extinguishments of debt
                                    -13,858,000  14,354,000              -30,000 152,000    274,000 767,000                      
      income before gains on sales of real estate
                                  142,273,000 119,915,000 131,331,000 144,813,000 163,243,000 115,431,000 58,521,000 117,357,000 148,599,000 85,406,000 123,792,000 100,739,000 114,086,000 85,323,000 109,038,000                                
      dividends per common share
                                  800 800 800 750 750 750 650 650                                       
      losses from interest rate contracts
                                        -140,000                                        
      losses from early extinguishments of debt
                                        -371,000                -5,494,000       -98,104,000  6,051,000 2,170,000  16,000 494,000       2,695,000  722,000  
      noncontrolling interest—redeemable preferred units of the operating partnership
                                             -3,000 -3,000 -9,000 -75,000 -320,000 -619,000 -2,661,000 -1,082,000 -1,123,000 -1,180,000 -1,057,000 -874,000 -765,000 -801,000 -842,000 -832,000 -842,000 -823,000 -795,000 -820,000 -836,000 -892,000 -860,000 -772,000 -972,000 -990,000          
      gains on consolidation of joint ventures
                                                    -1,810,000 387,801,000                           
      income from continuing operations
                                               85,323,000 109,038,000 95,901,000 67,756,000 77,506,000 82,910,000 505,888,000 40,929,000 74,931,000 66,103,000 97,471,000 56,359,000 115,443,000 80,451,000 69,738,000 48,194,000                  
      discontinued operations
                                                   170 510 10 100 -110  220 110                      
      income from discontinued operations
                                                   2,425,000 1,078,000 873,000 61,000 156,000  398,000 -156,000                      
      gain on sale of real estate from discontinued operations
                                                         36,877,000                       
      gain on forgiveness of debt from discontinued operations
                                                      20,182,000 4,451,750   17,807,000                      
      impairment income from discontinued operations
                                                      -3,241,000                          
      noncontrolling interest in discontinued operations—common units of the operating partnership
                                                   -2,891,000 -8,910,000 -88,000 -1,819,000 1,938,000  -4,094,000 -1,942,000                      
      gains on sales of real estate from discontinued operations
                                                   26,381,000 86,448,000                            
      noncontrolling interests in property partnership
                                                       -365,250 -458,000 -457,000 -546,000                      
      basic earnings per common share attributable to boston properties, inc.:
                                                                                
      diluted earnings per common share attributable to boston properties, inc.:
                                                                                
      acquisition costs
                                                           19,000 51,000 13,000 72,000 721,000 1,893,000                
      suspension of development
                                                                                
      noncontrolling interest in gain on sale of real estate—common units of the operating partnership
                                                                                
      gain from suspension of development
                                                                  -7,200,000              
      rental:
                                                                                
      interest and other
                                                               1,410,250 1,814,000 2,117,000 1,710,000 1,784,000 1,513,000 442,000 320,000 2,852,000 212,000 4,115,000 11,779,000 21,432,000 25,081,000 26,205,000 16,988,000  
      real estate operating:
                                                                                
      interest
                                                               71,471,750 97,103,000 96,755,000 92,029,000 88,180,000 77,090,000 78,633,000 78,930,000 71,261,000 68,308,000 64,564,000 67,839,000 68,289,000 69,929,000 73,743,000 73,926,000  
      loss from suspension of development
                                                               -1,800,000                 
      income before income from unconsolidated joint ventures, gains on sales of real estate and net income attributable to noncontrolling interests
                                                               43,352,250 56,524,000 64,053,000 52,832,000 47,743,750 68,906,000 75,931,000           
      net income attributable to noncontrolling interests:
                                                                                
      noncontrolling interest in gains on sales of real estate—common units of the operating partnership
                                                               2,000  -125,000 -227,000 -331,000 -307,000 -629,000 -401,000          
      losses (gains) from investments in securities
                                                                 678,000 -200,000 -510,000 -1,317,000 -1,194,000           
      income from suspension of development
                                                                      27,766,000          
      net derivative losses
                                                                       7,172,000 6,318,000 -257,000 3,788,000      
      weighted-average number of common shares outstanding—diluted
                                                                    139,225,000 125,620,000 121,468,000          
      losses from investments in securities
                                                                      587,000          
      income before income from unconsolidated joint ventures, gains on sale of real estate and net income attributable to noncontrolling interests
                                                                      46,138,000          
      net income attributable to the common shareholders of boston properties, inc.
                                                                      44,598,000          
      basic earnings per common share:
                                                                                
      diluted earnings per common share:
                                                                                
      income before minority interests in property partnerships, income from unconsolidated joint ventures, minority interest in operating partnership, gains on sales of real estate and discontinued operations
                                                                       55,539,500 54,310,000 86,805,000 81,043,000      
      minority interests in property partnerships
                                                                       -427,000 -525,000 -420,000 -625,000      
      income before minority interest in operating partnership, gains on sales of real estate and discontinued operations
                                                                       56,532,250 56,429,000 88,240,000 81,460,000 69,722,500 88,053,000 107,700,000 83,137,000  
      minority interest in operating partnership
                                                                       14,480,000 -9,420,000 -14,009,000 -13,024,000 -22,461,000 -14,178,000 -17,072,000 -11,164,000  
      income before gains on sales of real estate and discontinued operations
                                                                       47,410,750 47,009,000 74,231,000 68,436,000 59,108,750 73,875,000 90,628,000 71,973,000  
      gains on sales of real estate, net of minority interest
                                                                       6,705,750 1,497,000 5,303,000 20,025,000 197,213,750 168,495,000  619,206,000  
      income before discontinued operations
                                                                       -91,234,000 48,506,000 79,534,000 88,461,000 256,322,500 242,370,000 90,628,000 691,179,000  
      discontinued operations:
                                                                                
      income from discontinued operations, net of minority interest
                                                                           4,923,000   1,280,000  
      gain on sale of real estate from discontinued operations, net of minority interest
                                                                           43,474,750  11,716,000 161,848,000  
      net income available to common shareholders
                                                                       -91,234,000 48,506,000 79,534,000 88,461,000 124,218,000 242,370,000 102,344,000 854,307,000  
      income available to common shareholders before discontinued operations
                                                                       -770 400 660 740 2,132.5 2,020 760 5,760  
      discontinued operations, net of minority interest
                                                                           430  100 1,380  
      income before minority interest in property partnership, income from unconsolidated joint ventures, minority interest in operating partnership, gains on sales of real estate and discontinued operations
                                                                           64,816,750 86,663,000 90,432,000 82,172,000  
      minority interest in property partnership
                                                                                
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 
                                                                                  
        assets
                                                                                  
        real estate, at cost
      28,241,879,000 28,609,784,000 28,428,074,000 28,115,423,000 27,870,623,000 27,557,824,000 27,273,494,000 27,063,048,000 26,749,209,000 26,031,390,000 25,762,722,000 25,559,720,000 25,389,663,000  24,700,571,000 23,902,226,000 23,752,630,000 23,711,400,000 23,417,175,000      22,502,976,000  21,943,208,000 21,741,265,000 21,649,896,000 21,687,639,000 21,526,520,000 21,316,644,000 21,096,642,000 20,859,245,000 20,614,366,000 20,392,260,000 19,902,756,000 18,690,403,000 18,424,542,000 19,481,535,000 18,412,086,000 18,207,934,000 18,153,816,000 19,236,403,000 18,362,993,000 17,680,555,000 17,258,665,000 18,978,765,000 17,105,492,000 17,059,235,000 13,503,575,000 14,893,328,000 13,165,836,000 13,143,487,000 12,937,143,000  12,031,660,000 11,786,353,000 11,567,294,000  10,015,347,000 9,984,329,000 9,823,024,000  9,768,619,000 9,687,069,000 9,577,375,000  9,434,884,000 9,277,500,000 9,231,874,000  8,961,830,000 9,037,468,000 9,019,237,000  
        right of use assets - finance leases
      372,470,000 372,747,000 372,839,000 372,845,000 372,922,000 372,896,000 372,896,000 401,486,000 401,680,000 237,532,000 237,526,000 237,503,000 237,510,000  237,488,000 237,501,000 237,507,000 237,845,000 237,765,000      237,394,000  187,269,000 187,292,000                                                 
        right of use assets - operating leases
      325,841,000 321,063,000 325,670,000 330,129,000 334,767,000 339,804,000 344,292,000 344,255,000 324,298,000 322,790,000 166,421,000 166,699,000 167,351,000  168,370,000 169,248,000 169,778,000 170,085,000 170,331,000      148,640,000  149,839,000 151,166,000                                                 
        less: accumulated depreciation
      -8,040,311,000 -8,008,908,000 -7,863,743,000 -7,699,234,000 -7,528,057,000 -7,369,545,000 -7,198,566,000 -7,040,501,000 -6,881,728,000 -6,723,616,000 -6,568,568,000 -6,424,547,000 -6,298,082,000  -6,077,270,000 -5,995,760,000 -5,883,961,000 -5,850,397,000 -5,752,818,000      -5,266,798,000  -5,050,606,000 -4,962,959,000 -4,897,777,000 -4,838,496,000 -4,745,590,000 -4,674,838,000  -4,484,798,000 -4,379,446,000 -4,302,283,000 -4,113,553,000 -4,056,716,000 -3,969,648,000 -3,925,894,000 -3,833,277,000 -3,753,926,000 -3,646,853,000 -3,547,659,000 -3,469,130,000 -3,368,974,000 -3,263,208,000 -3,161,571,000 -3,076,280,000 -2,996,520,000 -2,919,980,000 -2,934,160,000 -2,843,167,000 -2,781,218,000 -2,722,605,000 -2,642,986,000 -2,558,620,000 -2,468,165,000 -2,411,378,000 -2,323,818,000 -2,243,265,000 -2,173,300,000 -2,103,274,000 -2,033,677,000 -1,966,780,000 -1,901,558,000 -1,835,283,000 -1,768,785,000 -1,710,875,000 -1,647,145,000 -1,589,686,000 -1,531,707,000 -1,488,077,000 -1,474,771,000 -1,414,857,000 -1,392,055,000 
        total real estate
      20,899,879,000 21,294,686,000 21,262,840,000 21,119,163,000 21,050,255,000 20,900,979,000 20,792,116,000 20,768,288,000 20,593,459,000 19,868,096,000 19,598,101,000 19,539,375,000 19,496,442,000  19,029,159,000 18,313,215,000 18,275,954,000 18,268,933,000 18,072,453,000      17,622,212,000  17,229,710,000 17,116,764,000 16,752,119,000 16,849,143,000 16,780,930,000 16,641,806,000 16,507,008,000 16,374,447,000 16,234,920,000 16,089,977,000 15,789,203,000 15,740,152,000 15,569,424,000 15,555,641,000 15,569,008,000 15,612,331,000 15,575,438,000 15,688,744,000 15,886,276,000 15,894,949,000 15,860,776,000 15,817,194,000 15,826,599,000 15,835,914,000 12,270,705,000 11,959,168,000 11,534,066,000 11,365,172,000 11,352,574,000 10,746,486,000 10,639,176,000 10,584,621,000 10,597,044,000 10,441,117,000 9,529,710,000 9,175,766,000 9,112,760,000 9,065,881,000 9,020,214,000 8,960,285,000 8,898,077,000 8,849,559,000 8,791,304,000 8,619,040,000 8,527,908,000 8,718,188,000 8,315,692,000 8,337,015,000 8,308,750,000 8,160,403,000 
        cash and cash equivalents
      1,478,206,000 861,066,000 446,953,000 398,126,000 1,254,882,000 1,420,475,000 685,376,000 701,695,000 1,531,477,000 882,647,000 1,581,575,000 918,952,000 690,333,000  456,491,000 436,271,000 452,692,000 1,002,728,000 557,307,000      644,950,000  1,087,001,000 360,091,000 543,359,000 322,502,000 472,555,000 294,571,000 434,767,000 493,055,000 492,435,000 302,939,000 419,323,000 1,180,044,000 1,605,678,000 723,718,000 1,387,007,000 1,342,751,000 1,064,396,000 1,763,079,000 846,664,000 1,036,576,000 1,179,573,000 2,365,137,000 1,641,275,000 1,608,731,000 909,376,000 1,041,978,000 1,223,215,000 1,671,997,000 591,196,000 1,823,208,000 1,063,024,000 780,584,000 747,305,000 478,948,000 1,270,074,000 1,703,448,000 1,220,392,000 1,448,933,000 782,106,000 819,245,000 143,789,000 241,510,000 55,597,000 112,110,000 794,643,000 1,506,921,000 1,894,198,000 1,885,318,000 2,016,336,000 725,788,000 
        cash held in escrows
      79,060,000 77,663,000 80,888,000 81,081,000 80,314,000 51,009,000 52,125,000 64,939,000 81,090,000 47,741,000 46,915,000 45,330,000 46,479,000  46,359,000 46,072,000 48,466,000 79,193,000 79,973,000      46,936,000  75,923,000 72,207,000 95,832,000 101,282,000 254,505,000 160,558,000 70,602,000 83,779,000 47,345,000 51,244,000 63,980,000 65,654,000 71,349,000 73,790,000 90,379,000 252,558,000 588,218,000 487,321,000 153,161,000 59,248,000 54,240,000 57,201,000 53,499,000 54,829,000 55,410,000 55,181,000 32,253,000 31,381,000 30,697,000 40,332,000 36,759,000 302,439,000 305,692,000 308,031,000 300,771,000 25,382,000 20,848,000 21,867,000 20,681,000 22,289,000 19,420,000 21,970,000 34,311,000 59,644,000 57,640,000 186,839,000 17,835,000 22,665,000 20,334,000 25,784,000 
        investments in securities
      44,614,000 43,604,000 41,062,000 38,310,000 39,706,000 39,186,000 36,844,000 37,184,000 36,337,000 32,809,000 33,481,000 32,099,000 32,277,000  31,457,000 36,032,000 43,632,000 41,517,000 41,476,000      36,747,000  33,411,000 32,052,000 28,198,000 31,376,000 30,063,000 29,353,000 29,161,000 27,981,000 26,781,000 25,817,000 23,022,000 21,775,000 21,077,000 20,380,000 19,645,000 20,953,000 20,736,000 19,459,000 18,834,000 18,927,000 18,026,000 16,641,000 15,377,000 14,226,000 13,825,000 12,172,000 11,792,000 11,036,000 11,193,000 9,548,000 9,312,000 9,975,000 9,800,000  7,911,000 7,026,000 7,592,000  10,436,000 11,173,000 9,408,000  16,160,000 20,372,000 23,404,000      
        tenant and other receivables
      92,625,000 136,743,000 109,683,000 117,353,000 107,453,000 99,706,000 82,145,000 94,115,000 122,407,000 123,138,000 91,968,000 85,603,000 81,389,000  64,607,000 56,132,000 70,186,000 61,269,000 58,624,000      112,807,000  87,727,000 92,462,000 86,629,000 98,502,000 63,660,000 73,401,000 92,186,000 79,750,000 88,687,000 73,012,000 76,258,000 84,861,000 73,759,000 97,865,000 66,446,000 55,183,000 47,768,000 46,595,000 43,210,000 51,348,000 37,812,000 59,464,000 55,393,000 66,039,000 75,849,000 69,555,000 45,039,000 43,507,000 68,275,000 79,838,000 47,554,000 44,470,000 54,740,000 129,818,000 113,655,000 98,602,000 102,085,000 93,240,000 71,845,000 78,495,000 69,116,000 68,743,000 57,554,000 42,116,000 34,580,000 58,074,000 43,199,000 48,398,000 50,799,000 57,052,000 
        note receivable
      9,373,000 8,898,000 6,711,000 5,535,000 4,947,000 3,937,000 3,155,000 2,274,000 1,714,000                15,920,000  19,718,000 19,593,000 19,468,000                                                
        related party notes receivable
      28,346,000 88,879,000 88,825,000 88,816,000 88,779,000 88,788,000                                             282,307,000 282,491,000 282,206,000 282,416,000 281,177,000 280,442,000 276,375,000 276,375,000                   
        sales-type lease receivable
      15,672,000 15,430,000 15,188,000 14,958,000 14,657,000 14,429,000 14,182,000 13,943,000 13,704,000 13,475,000 13,250,000 13,028,000 12,811,000                                                                
        accrued rental income
      1,538,515,000 1,532,403,000 1,509,347,000 1,490,522,000 1,466,220,000 1,438,492,000 1,414,622,000 1,390,217,000 1,355,212,000 1,331,796,000 1,318,320,000 1,297,767,000 1,276,580,000  1,265,480,000 1,243,395,000 1,226,745,000 1,203,840,000 1,172,411,000      1,038,788,000  973,167,000 954,063,000 934,896,000 926,274,000 912,652,000 888,907,000 861,575,000 835,415,000 820,022,000 812,124,000 785,569,000 776,816,000 767,864,000 754,883,000 737,145,000 730,797,000 713,874,000 691,999,000 689,885,000 673,587,000 661,730,000 651,603,000 641,041,000 625,654,000 612,041,000 598,199,000 579,553,000 559,646,000 541,153,000 522,675,000 508,838,000 491,878,000 463,117,000 442,683,000 421,008,000 401,054,000 376,942,000 363,121,000 353,709,000 340,123,000 331,237,000 316,711,000 316,411,000 326,149,000 313,011,000 300,594,000 299,082,000 296,424,000 288,824,000 327,337,000 
        deferred charges
      847,690,000 802,785,000 809,033,000 806,057,000 813,345,000 794,571,000 800,099,000 818,424,000 760,421,000 692,386,000 710,820,000 720,174,000 733,282,000  684,078,000 609,205,000 618,798,000 622,807,000 627,338,000      689,213,000  676,082,000 666,320,000 678,724,000 669,545,000 678,319,000 681,369,000 679,038,000 657,474,000 658,219,000 666,677,000 680,192,000 697,823,000 693,976,000 732,837,000 749,628,000 771,419,000 806,468,000 831,744,000 837,907,000 853,924,000 861,567,000 884,450,000 918,798,000 939,675,000 572,890,000 588,235,000 534,898,000 504,475,000 500,957,000 445,403,000 441,700,000 449,014,000 449,076,000 436,019,000 300,882,000 289,388,000 291,564,000 294,395,000 288,642,000 283,830,000 301,889,000 326,401,000 314,562,000 305,287,000 294,002,000 287,199,000 257,469,000 264,664,000 244,846,000 274,079,000 
        prepaid expenses and other assets
      108,105,000 137,561,000 89,624,000 138,868,000 70,839,000 132,078,000 86,188,000 146,286,000 64,230,000 121,431,000 77,457,000 141,933,000 43,589,000  55,232,000 128,472,000 57,811,000 97,560,000 46,946,000      41,685,000  68,701,000 131,472,000 80,943,000 133,443,000 85,972,000 147,256,000 77,971,000 144,817,000 93,985,000 150,905,000 176,693,000 144,222,000 136,799,000 185,118,000 143,476,000 117,993,000 165,985,000 164,432,000 219,074,000 133,035,000 178,488,000 184,477,000 238,688,000 179,741,000 71,756,000 90,610,000 132,109,000 41,480,000 73,132,000 75,458,000 102,812,000 92,470,000 100,897,000 65,663,000 42,391,000 22,385,000 50,998,000 17,684,000 41,977,000 22,905,000 47,664,000 22,401,000 44,039,000 26,511,000 51,357,000 30,566,000 55,658,000 47,174,000 63,896,000 40,868,000 
        investments in unconsolidated joint ventures
      999,309,000 999,764,000 1,161,036,000 1,137,732,000 1,093,583,000 1,421,886,000 1,418,817,000 1,399,824,000 1,377,319,000 1,536,822,000 1,780,959,000 1,752,617,000 1,715,911,000  1,554,994,000 1,518,622,000 1,482,997,000 1,373,522,000 1,305,589,000      955,647,000  936,835,000 976,580,000 956,309,000 925,431,000 682,507,000 666,718,000 619,925,000 611,800,000 819,368,000 793,932,000 775,659,000 252,618,000 235,904,000 235,224,000 217,529,000 209,974,000 196,188,000 193,394,000 180,149,000 176,939,000 127,356,000 126,084,000 129,038,000 137,975,000 652,807,000 659,916,000 664,690,000 670,653,000 667,377,000 669,722,000 770,466,000 772,502,000 762,522,000 767,252,000 792,434,000 794,650,000 798,161,000 763,636,000 772,167,000 772,319,000 781,336,000 782,760,000 973,396,000 606,696,000 152,942,000 81,672,000 102,488,000 92,944,000 91,955,000 83,711,000 
        assets held for sale
      24,770,000                                                                            
        total assets
      26,166,164,000 25,999,482,000 25,621,190,000 25,436,521,000 26,084,980,000 26,405,536,000 25,474,448,000 25,525,978,000 26,026,149,000 24,739,148,000 25,341,680,000 24,625,422,000 24,207,669,000 6,513,820,000 23,266,433,000 22,475,634,000 22,365,258,000 22,848,810,000 22,059,076,000 5,217,147,000 5,239,642,000 5,212,458,000 5,063,698,000 5,047,928,000 21,284,905,000 4,280,319,000 21,268,275,000 20,501,604,000 20,256,477,000 20,137,498,000 19,961,163,000 19,583,939,000 19,372,233,000 19,308,518,000 19,281,762,000 18,966,627,000 18,789,899,000 18,963,965,000 19,175,830,000 18,379,456,000 18,980,263,000 19,113,959,000 19,179,071,000 19,886,767,000 18,875,160,000 18,898,533,000 18,979,568,000 20,162,251,000 19,519,708,000 19,462,784,000 15,623,279,000 15,462,321,000 15,141,943,000 15,280,629,000 14,212,857,000 14,782,966,000 13,980,798,000 13,884,212,000 13,835,473,000 13,348,263,000 13,048,836,000 12,787,701,000 12,251,342,000 12,348,703,000 11,631,777,000 11,580,664,000 10,871,936,000 10,911,645,000 10,873,334,000 10,387,925,000 10,349,487,000 11,192,637,000 10,985,621,000 10,994,602,000 11,085,740,000 9,695,022,000 
        liabilities and equity
                                                                                  
        liabilities:
                                                                                  
        mortgage notes payable
      4,280,067,000 4,279,482,000 4,278,788,000 4,277,710,000 4,276,609,000 4,275,155,000 4,371,478,000 4,368,367,000 4,166,379,000 3,275,974,000 3,274,764,000 3,273,553,000 3,272,368,000  3,269,948,000 3,268,745,000 3,267,914,000 2,898,699,000 2,901,709,000      2,922,408,000  2,956,833,000 2,959,908,000 2,964,572,000 2,967,548,000 2,972,052,000 2,974,930,000 2,979,281,000 2,982,067,000 2,986,283,000 2,046,959,000 2,077,707,000 3,189,013,000 3,416,622,000 3,438,714,000 4,132,071,000 4,269,808,000 4,289,120,000 4,309,484,000 4,328,464,000 4,411,453,000 4,430,110,000 4,449,734,000 4,468,069,000 4,484,657,000 3,053,798,000 3,102,485,000 2,848,686,000 2,877,125,000 2,946,760,000 3,123,267,000 3,179,034,000 3,181,469,000 3,188,025,000 3,047,586,000 2,813,338,000 2,608,577,000 2,637,534,000 2,643,301,000 2,643,497,000 2,603,597,000 2,669,705,000 2,660,642,000 2,282,699,000 2,535,496,000 2,760,620,000 2,726,127,000 2,644,393,000 2,855,889,000 2,973,571,000 2,679,462,000 
        unsecured senior notes
      9,806,100,000 9,803,336,000 9,800,577,000 9,797,824,000 10,645,077,000 10,642,033,000 9,797,220,000 9,794,527,000 10,491,617,000 10,488,568,000 10,985,395,000 10,240,967,000 10,237,968,000  9,489,030,000 9,486,379,000 9,483,695,000 10,479,651,000 9,634,356,000      8,390,459,000  8,390,708,000 7,547,043,000 7,544,697,000 7,253,786,000 7,251,578,000 7,249,383,000 7,247,330,000 7,252,567,000 7,250,356,000 7,248,152,000 7,243,767,000 6,257,274,000 6,255,602,000 5,289,317,000 5,288,908,000 5,288,503,000 5,288,101,000 5,287,704,000 5,837,172,000 5,836,729,000 5,836,290,000 5,835,854,000 5,835,424,000 5,834,973,000 4,639,843,000 4,639,528,000 4,639,217,000 4,863,413,000 3,865,369,000 3,865,186,000 3,016,986,000 3,016,837,000 3,016,743,000 3,016,598,000 2,872,058,000 2,871,909,000 2,172,525,000 2,172,389,000 1,472,740,000 1,472,617,000 1,472,495,000 1,472,375,000 1,472,258,000 1,472,141,000 1,472,027,000 1,471,913,000 1,471,801,000 1,471,691,000 1,471,583,000 1,471,475,000 
        unsecured exchangeable senior notes
      976,263,000 975,080,000                                              744,880,000 739,536,000 734,278,000 1,177,877,000 1,170,356,000 1,162,955,000 1,155,669,000 1,148,497,000 1,715,685,000 1,754,343,000 1,743,337,000 1,732,496,000 1,721,817,000 1,759,490,000 1,748,814,000 1,864,840,000 1,904,081,000 1,892,753,000 1,881,482,000 1,870,600,000 2,038,899,000 2,037,506,000 1,296,252,000 1,295,185,000 1,294,126,000 1,293,074,000 1,292,022,000 1,290,985,000 450,000,000 
        unsecured line of credit
        185,000,000 300,000,000           165,000,000 255,000,000 145,000,000             170,000,000  115,000,000 45,000,000   105,000,000                               100,000,000 100,000,000 319,000,000 200,000,000       
        unsecured term loans
      797,053,000 796,798,000 796,640,000 796,158,000 798,813,000 798,058,000                                                                       
        unsecured commercial paper
      750,000,000 750,000,000 750,000,000 500,000,000 500,000,000 500,000,000 500,000,000                                                                      
        lease liabilities - finance leases
      360,039,000 363,207,000 365,897,000 368,379,000 370,885,000 373,260,000 375,601,000 415,888,000 417,961,000 253,178,000 251,874,000 250,567,000 249,335,000  246,832,000 245,554,000 244,421,000 243,562,000 243,381,000      224,042,000  172,902,000 173,123,000                                                 
        lease liabilities - operating leases
      389,213,000 379,792,000 399,174,000 395,638,000 392,686,000 389,444,000 385,842,000 377,667,000 350,391,000 341,299,000 204,826,000 204,435,000 204,686,000  204,643,000 204,677,000 204,561,000 204,137,000 226,594,000      200,180,000  199,344,000 199,653,000                                                 
        accounts payable and accrued expenses
      480,017,000 484,798,000 480,158,000 398,760,000 401,874,000 444,288,000 372,484,000 374,681,000 458,329,000 462,240,000 434,574,000 397,798,000 417,545,000  342,467,000 304,576,000 320,775,000 331,687,000 305,969,000      377,553,000  418,429,000 328,885,000 276,645,000 315,462,000 327,067,000 355,002,000 331,500,000 325,440,000 303,559,000 313,723,000 312,979,000 287,464,000 252,727,000 274,709,000 245,200,000 231,900,000 224,086,000 243,263,000 253,600,000 216,080,000 218,028,000 202,470,000 215,778,000 212,998,000 210,359,000 199,102,000 193,492,000 163,496,000 165,441,000 155,139,000 172,928,000 173,257,000 171,617,000 186,059,000 199,534,000 177,000,000 189,633,000 220,089,000 229,177,000 223,909,000 200,269,000 171,791,000 164,986,000 183,192,000 128,769,000 145,692,000 133,714,000 123,910,000 101,188,000 102,934,000 
        dividends and distributions payable
      123,753,000 123,259,000 172,732,000 172,674,000 172,486,000 172,191,000 172,172,000 172,154,000 171,176,000 171,916,000 171,465,000 171,427,000 170,643,000  170,937,000 170,869,000 169,859,000 169,739,000 169,718,000      170,713,000  165,419,000 165,352,000 165,114,000 165,118,000 139,263,000 139,218,000 139,040,000 130,434,000 130,432,000 130,418,000 113,038,000 113,071,000 113,079,000 327,320,000 112,912,000 112,892,000 112,796,000 882,472,000 112,708,000 112,420,000 114,799,000 497,242,000 112,470,000 112,425,000 110,886,000 110,488,000 93,461,000 93,353,000 92,615,000 91,901,000 83,584,000 83,369,000 83,019,000 81,031,000 81,068,000 80,865,000 80,756,000 80,536,000 80,463,000 80,475,000 97,547,000 97,162,000 96,491,000 96,451,000 105,150,000 944,870,000 96,152,000 96,192,000 105,284,000 857,892,000 
        accrued interest payable
      125,345,000 120,128,000 120,975,000 120,432,000 128,098,000 121,360,000 112,107,000 119,573,000 133,684,000 128,422,000 111,088,000 114,400,000 103,774,000  96,821,000 90,861,000 94,796,000 87,408,000 107,386,000      90,016,000  89,289,000 89,171,000 89,267,000 92,809,000 96,844,000 96,176,000 83,646,000 99,100,000 85,172,000 266,714,000 234,628,000 222,175,000 221,578,000 190,386,000 200,916,000 178,548,000 186,630,000 163,532,000 181,954,000 156,024,000 178,651,000 167,523,000 181,310,000 141,676,000 99,491,000 72,461,000 98,601,000 61,947,000 97,997,000 69,105,000 89,555,000 62,046,000 88,070,000 62,327,000 84,689,000 80,521,000 69,166,000 76,058,000 49,536,000 66,463,000 50,329,000 67,132,000 48,705,000 55,979,000 47,355,000 54,487,000 46,671,000 59,105,000 48,917,000 47,441,000 
        other liabilities
      386,074,000 406,820,000 416,838,000 450,165,000 450,796,000 407,441,000 398,525,000 417,978,000 445,947,000 380,014,000 418,813,000 465,276,000 450,918,000 681,228,000 401,360,000 396,283,000 391,441,000 370,403,000 370,990,000 599,354,000 650,433,000 651,744,000 655,709,000 638,892,000 387,994,000 773,033,000 355,984,000 369,575,000 503,726,000 468,433,000 462,869,000 470,140,000 443,980,000 419,215,000 452,608,000 446,489,000 461,079,000 508,952,000 498,290,000 483,601,000 448,680,000 448,480,000 483,762,000 502,255,000 517,428,000 539,716,000 556,772,000 578,969,000 567,464,000 556,730,000 316,683,000 324,613,000 309,004,000 308,354,000 324,826,000 293,515,000 244,555,000 231,702,000 210,392,000 213,000,000 104,914,000 95,423,000 115,755,000 127,538,000 131,193,000 126,560,000 133,662,000 173,750,000 167,646,000 187,104,000 221,432,000 232,705,000 198,314,000 201,406,000 229,666,000 239,084,000 
        total liabilities
      18,473,924,000 18,482,700,000 17,766,779,000 17,577,740,000 18,137,324,000 18,123,230,000 17,184,205,000 17,240,265,000 17,833,785,000 16,698,784,000 17,048,845,000 16,313,339,000 15,837,237,000  15,115,833,000 14,422,944,000 14,322,462,000 14,785,286,000 13,960,103,000      13,262,304,000  13,247,608,000 12,331,317,000 12,042,509,000 11,931,524,000 11,747,921,000 11,399,849,000 11,269,777,000 11,208,823,000 11,208,410,000 11,044,189,000 10,930,646,000 11,065,746,000 11,246,040,000 10,492,529,000 10,917,504,000 11,019,279,000 11,073,970,000 11,878,506,000 11,721,440,000 11,762,849,000 11,825,385,000 12,967,712,000 12,611,391,000 12,569,374,000 9,608,937,000 9,619,033,000 9,345,416,000 9,523,357,000 8,641,505,000 9,313,798,000 8,540,985,000 8,492,017,000 8,490,362,000 8,328,418,000 7,915,091,000 7,663,109,000 7,130,209,000 7,223,992,000 6,499,359,000 6,455,103,000 6,594,607,000 6,781,751,000 6,589,291,000 6,026,615,000 6,030,538,000 6,869,920,000 5,884,119,000 6,100,215,000 6,221,194,000 5,848,288,000 
        bxp, inc.consolidated balance sheets
                                                                                  
        commitments and contingencies
                                                                                  
        redeemable deferred stock units— 111,701 and 128,227 units outstanding at redemption value at december 31, 2025 and december 31, 2024, respectively
      7,538,000                                                                            
        equity:
                                                                                  
        stockholders’ equity attributable to bxp, inc.:
                                                                                  
        excess stock, 0.01 par value...
                                                                                  
        preferred stock, 0.01 par value...
                                                                                  
        common stock, 0.01 par value...
      1,585,000 1,584,000 1,584,000 1,583,000 1,582,000 1,580,000 1,571,000 1,570,000 1,569,000 1,569,000 1,569,000 1,568,000 1,568,000  1,567,000 1,567,000 1,565,000 1,562,000 1,561,000      1,548,000    1,545,000 1,544,000 1,544,000 1,544,000 1,543,000 1,543,000 1,543,000 1,538,000 1,538,000 1,537,000 1,536,000                                      
        additional paid-in capital
      6,836,243,000 6,827,889,000 6,854,753,000 6,846,015,000 6,836,093,000 6,822,489,000 6,768,686,000 6,752,648,000 6,715,149,000 6,568,645,000 6,561,161,000 6,549,314,000 6,539,147,000  6,524,997,000 6,509,663,000 6,497,730,000 6,415,802,000 6,405,916,000      6,294,719,000    6,407,623,000 6,400,193,000 6,391,460,000 6,384,147,000 6,377,908,000 6,370,932,000 6,363,034,000 6,339,970,000 6,326,580,000 6,316,191,000 6,306,723,000 6,305,687,000 6,300,780,000 6,293,556,000 6,286,260,000 6,270,257,000 5,684,649,000 5,679,578,000 5,668,230,000 5,662,453,000 5,250,174,000 5,246,243,000 5,232,030,000 5,222,073,000 5,194,569,000 5,184,710,000 5,050,547,000 4,936,457,000 4,916,440,000 4,846,003,000 4,771,659,000 4,417,162,000 4,424,711,000 4,394,435,000 4,381,075,000 4,373,679,000 4,362,874,000 4,358,830,000 3,560,797,000 3,369,850,000 3,317,358,000 3,341,887,000 3,317,643,000 3,305,219,000 3,289,760,000 3,263,797,000 3,260,647,000 3,119,941,000 
        dividends in excess of earnings
      -1,674,995,000 -1,812,361,000 -1,579,770,000 -1,513,555,000 -1,419,575,000 -1,035,710,000 -964,518,000 -890,177,000 -816,152,000 -782,275,000 -516,550,000 -467,159,000 -391,356,000  -567,016,000 -636,421,000 -625,891,000 -657,021,000 -612,247,000      -760,523,000    -675,534,000 -677,312,000 -649,747,000 -654,879,000 -712,343,000 -692,739,000 -694,320,000 -712,270,000 -725,522,000 -702,361,000 -699,048,000 -780,952,000 -627,054,000 -711,239,000 -690,993,000 -762,464,000 -148,566,000 -176,929,000 -153,979,000 -108,552,000   -160,697,000 -109,985,000 -59,621,000 -34,463,000 -70,609,000 -53,080,000 -72,941,000 -69,537,000 -56,479,000                  
        treasury common stock at cost, 78,900 shares at december 31, 2025 and december 31, 2024
      -2,722,000                                                                            
        accumulated other comprehensive loss
      -12,921,000 -14,831,000 -15,059,000 -11,379,000 -2,072,000 -26,428,000 -155,000 -3,620,000 -21,147,000  -3,406,000 -18,214,000 -13,718,000  -27,077,000 -28,485,000 -36,662,000 -40,803,000 -43,166,000      -48,335,000    -47,741,000 -45,137,000 -47,695,000 -49,062,000 -50,429,000 -51,796,000 -53,161,000 -50,983,000 -73,943,000 -79,748,000 -56,706,000 -14,114,000 -20,625,000  -11,907,000 -9,304,000 -9,866,000 -10,429,000 -10,989,000 -11,556,000 -12,122,000 -12,689,000 -13,253,000 -13,817,000 -14,379,000 -14,978,000 -15,558,000 -16,138,000 -16,717,000 -17,294,000 -17,867,000 -18,436,000 -19,530,000 -20,155,000 -21,145,000 -21,777,000 -22,411,000 -28,464,000 -29,202,000 -29,916,000 -37,445,000 -41,868,000 -53,091,000 -29,191,000 -6,342,000 -3,338,000 -3,239,000 -3,323,000 
        total stockholders’ equity attributable to bxp, inc.
      5,147,190,000 4,999,559,000 5,258,786,000 5,319,942,000 5,413,306,000 5,759,209,000 5,802,862,000                                                                      
        noncontrolling interests:
                                                                                  
        common units of boston properties limited partnership
      566,563,000 554,440,000 584,651,000 591,555,000 591,270,000 638,129,000 677,789,000 684,969,000 666,580,000 656,587,000 689,123,000 691,627,000 683,583,000  660,214,000 649,602,000 642,655,000 609,830,000 615,308,000      600,860,000    619,352,000 618,380,000 621,221,000 619,347,000  605,802,000 604,997,000 617,252,000                                         
        property partnerships
      1,970,949,000 1,954,777,000 2,003,993,000 1,938,344,000 1,933,545,000 1,874,272,000 1,801,676,000 1,734,904,000 1,640,704,000 1,588,906,000 1,557,368,000 1,552,070,000 1,547,317,000  1,552,706,000 1,548,455,000 1,556,553,000 1,728,101,000 1,725,343,000      1,728,689,000    1,711,445,000 1,711,028,000 1,699,181,000 1,685,715,000 1,683,760,000 1,668,675,000 1,653,981,000 1,529,653,000 1,525,042,000 1,552,937,000 1,563,912,000 1,574,400,000 1,590,808,000 1,590,481,000 1,599,502,000 1,602,467,000 716,565,000 721,096,000 725,093,000 726,132,000 481,629,000 489,389,000 8,273,000 -1,964,000 -1,852,000 -1,560,000 -1,267,000 -1,063,000 -996,000 -582,000 -585,000 -614,000 6,728,000 6,339,000 5,975,000 5,671,000 5,715,000 5,101,000 5,660,000          
        total equity
      7,684,702,000 7,508,776,000 7,847,430,000 7,849,841,000 7,938,121,000 8,271,610,000 8,282,327,000 8,277,572,000 8,183,981,000 8,033,576,000 8,286,543,000 8,306,484,000 8,363,819,000  8,142,669,000 8,041,659,000 8,033,228,000 8,054,749,000 8,089,993,000      8,014,236,000    8,213,968,000 8,205,974,000 8,213,242,000 8,184,090,000 8,102,456,000 8,099,695,000 8,073,352,000 7,922,438,000 7,859,253,000 7,898,219,000 7,929,790,000 7,886,927,000 8,062,759,000 7,988,447,000 7,998,948,000 7,902,936,000 7,047,593,000 7,013,900,000 7,002,544,000 7,043,618,000 6,741,862,000 6,684,372,000 5,805,250,000 5,634,854,000 5,685,651,000 5,705,735,000 5,519,815,000 5,413,516,000 5,384,161,000 5,336,543,000 5,289,459,000 4,964,193,000 5,078,093,000 5,068,940,000 5,065,481,000 5,069,059,000 5,076,766,000 5,069,909,000 4,221,677,000          
        total liabilities and equity
      26,166,164,000 25,999,482,000 25,621,190,000 25,436,521,000 26,084,980,000 26,405,536,000 25,474,448,000 25,525,978,000 26,026,149,000 24,739,148,000 25,341,680,000 24,625,422,000 24,207,669,000  23,266,433,000 22,475,634,000 22,365,258,000 22,848,810,000 22,059,076,000      21,284,905,000    20,256,477,000 20,137,498,000 19,961,163,000 19,583,939,000 19,372,233,000 19,308,518,000 19,281,762,000 18,966,627,000 18,789,899,000 18,963,965,000 19,175,830,000 18,379,456,000 18,980,263,000 19,113,959,000 19,179,071,000 19,886,767,000 18,875,160,000 18,898,533,000 18,979,568,000 20,162,251,000 19,519,708,000 19,462,784,000 15,623,279,000 15,462,321,000 15,141,943,000 15,280,629,000 14,212,857,000 14,782,966,000 13,980,798,000 13,884,212,000 13,835,473,000 13,348,263,000 13,048,836,000 12,787,701,000 12,251,342,000 12,348,703,000 11,631,777,000 11,580,664,000 10,871,936,000          
        redeemable deferred stock units— 107,696 and 128,227 units outstanding at redemption value at september 30, 2025 and december 31, 2024, respectively
       8,006,000                                                                           
        treasury common stock at cost, 78,900 shares at september 30, 2025 and december 31, 2024
       -2,722,000                                                                           
        redeemable deferred stock units— 103,473 and 128,227 units outstanding at redemption value at june 30, 2025 and december 31, 2024, respectively
        6,981,000                                                                          
        treasury common stock at cost, 78,900 shares at june 30, 2025 and december 31, 2024
        -2,722,000                                                                          
        redeemable deferred stock units— 133,051 and 128,227 units outstanding at redemption value at march 31, 2025 and december 31, 2024, respectively
         8,940,000                                                                         
        treasury common stock at cost, 78,900 shares at march 31, 2025 and december 31, 2024
         -2,722,000                                                                         
        redeemable deferred stock units— 128,227 and 119,471 units outstanding at redemption value at december 31, 2024 and december 31, 2023, respectively
          9,535,000                                                                        
        treasury common stock at cost, 78,900 shares at december 31, 2024 and december 31, 2023
          -2,722,000                                                                        
        redeemable deferred stock units— 132,930 and 119,471 units outstanding at redemption value at september 30, 2024 and december 31, 2023, respectively
           10,696,000                                                                       
        treasury common stock at cost, 78,900 shares at september 30, 2024 and december 31, 2023
           -2,722,000                                                                       
        related party note receivable
            88,779,000 88,789,000 88,779,000 88,807,000 88,834,000 78,544,000 78,576,000  78,576,000 78,544,000 78,336,000 78,144,000 77,872,000      80,000,000  80,000,000 80,000,000 80,000,000 80,000,000                             270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 270,000,000 100,000,000      
        unsecured term loan
            698,776,000 1,199,430,000 1,198,301,000 1,197,173,000 1,196,046,000 1,194,916,000 730,000,000  728,795,000          498,939,000  498,700,000 498,607,000 498,488,000 498,368,000 498,248,000                                              
        redeemable deferred stock units— 128,584 and 119,471 units outstanding at redemption value at june 30, 2024 and december 31, 2023, respectively
            7,916,000                                                                      
        treasury common stock at cost, 78,900 shares at june 30, 2024 and december 31, 2023
            -2,722,000                                                                      
        boston properties, inc.consolidated balance sheets
                                                                                  
        redeemable deferred stock units— 124,656 and 119,471 units outstanding at redemption value at march 31, 2024 and december 31, 2023, respectively
             8,141,000                                                                     
        stockholders’ equity attributable to boston properties, inc.:
                                                                                  
        treasury common stock at cost, 78,900 shares at march 31, 2024 and december 31, 2023
             -2,722,000                                                                     
        total stockholders’ equity attributable to boston properties, inc.
             5,857,699,000 5,876,697,000 5,788,083,000 6,040,052,000 6,062,787,000 6,132,919,000  5,929,749,000 5,843,602,000 5,834,020,000 5,716,818,000 5,749,342,000      5,684,687,000    5,883,171,000 5,876,566,000 5,892,840,000 5,879,028,000 5,813,957,000 5,825,218,000 5,814,374,000 5,775,533,000 5,725,931,000 5,732,897,000 5,749,783,000 5,709,435,000 5,851,915,000 5,782,978,000 5,782,172,000 5,697,298,000 5,725,026,000 5,691,029,000 5,702,070,000 5,741,153,000 5,683,060,000 5,624,848,000 5,256,874,000 5,097,065,000 5,119,356,000 5,134,054,000 4,963,152,000 4,865,998,000 4,825,536,000 4,757,914,000 4,696,042,000 4,372,643,000 4,461,911,000 4,443,377,000 4,437,243,000 4,446,002,000 4,450,591,000 4,444,056,000 3,647,168,000          
        redeemable deferred stock units— 119,471 and 97,853 units outstanding at redemption value at december 31, 2023 and december 31, 2022, respectively
              8,383,000                                                                    
        treasury common stock at cost, 78,900 shares at december 31, 2023 and december 31, 2022
              -2,722,000                                                                    
        redeemable deferred stock units— 114,124 and 97,853 units outstanding at redemption value at september 30, 2023 and december 31, 2022, respectively
               6,788,000                                                                   
        treasury common stock at cost, 78,900 shares at september 30, 2023 and december 31, 2022
               -2,722,000                                                                   
        accumulated other comprehensive income
               2,866,000                                1,848,000                                   
        redeemable deferred stock units— 108,642 and 97,853 units outstanding at redemption value at june 30, 2023 and december 31, 2022, respectively
                6,292,000                                                                  
        treasury common stock at cost, 78,900 shares at june 30, 2023 and december 31, 2022
                -2,722,000                                                                  
        redeemable deferred stock units— 103,454 and 97,853 units outstanding at redemption value at march 31, 2023 and december 31, 2022, respectively
                 5,599,000                                                                 
        treasury common stock at cost, 78,900 shares at march 31, 2023 and december 31, 2022
                 -2,722,000                                                                 
        notes receivable
                     9,674,000 9,641,000 19,297,000 19,087,000                                                          
        redeemable deferred stock units— 97,853 and 83,073 units outstanding at redemption value at december 31, 2022 and december 31, 2021, respectively
                  6,613,000                                                                
        treasury common stock at cost, 78,900 shares at december 31, 2022 and december 31, 2021
                  -2,722,000                                                                
        real estate and development in process
                   5,858,271,000      4,711,593,000 4,708,571,000 4,651,694,000 4,527,828,000 4,469,460,000  3,782,279,000                                                   
        other assets
                   655,549,000      505,554,000 531,071,000 560,764,000 535,870,000 578,468,000  498,040,000                                                   
        liabilities and members’/partners’ equity
                                                                                  
        mortgage and notes payable
                   3,425,972,000      2,662,616,000 2,637,911,000 2,558,499,000 2,465,039,000 2,312,938,000  2,107,805,000                                                   
        members’/partners’ equity
                   2,406,620,000      1,955,177,000 1,951,298,000 2,002,215,000 1,942,950,000 2,096,098,000  1,399,481,000                                                   
        total liabilities and members’/partners’ equity
                   6,513,820,000      5,217,147,000 5,239,642,000 5,212,458,000 5,063,698,000 5,047,928,000  4,280,319,000                                                   
        company’s share of equity
                   1,180,507,000      933,739,000 936,087,000 948,569,000 911,682,000 956,136,000  569,704,000                                                   
        basis differentials
                   346,312,000      338,337,000 337,832,000 399,266,000 398,896,000 398,976,000  340,391,000                                                   
        carrying value of the company’s investments in unconsolidated joint ventures
                   1,526,819,000      1,272,076,000 1,273,919,000 1,347,835,000 1,310,578,000 1,355,112,000  910,095,000                                                   
        redeemable deferred stock units— 89,132 and 83,073 units outstanding at redemption value at june 30, 2022 and december 31, 2021, respectively
                    7,931,000                                                              
        treasury common stock at cost, 78,900 shares at june 30, 2022 and december 31, 2021
                    -2,722,000                                                              
        redeemable deferred stock units— 85,645 and 83,073 units outstanding at redemption value at march 31, 2022 and december 31, 2021, respectively
                     11,031,000                                                             
        treasury common stock at cost, 78,900 shares at march 31, 2022 and december 31, 2021
                     -2,722,000                                                             
        redeemable deferred stock units— 83,073 and 72,966 units outstanding at redemption value at december 31, 2021 and december 31, 2020, respectively
                      9,568,000                                                            
        5.25% series b cumulative redeemable preferred stock, 0.01 par value...
                              200,000,000    200,000,000 200,000,000 200,000,000 200,000,000 200,000,000 200,000,000 200,000,000 200,000,000 200,000,000 200,000,000 200,000,000                                      
        treasury common stock at cost, 78,900 shares at december 31, 2021 and december 31, 2020
                      -2,722,000                                                            
        redeemable deferred stock units— 80,989 and 72,966 units outstanding at redemption value at september 30, 2021 and december 31, 2020, respectively
                       8,775,000                                                           
        treasury common stock at cost, 78,900 shares at september 30, 2021 and december 31, 2020
                       -2,722,000                                                           
        redeemable deferred stock units— 78,362 and 72,966 units outstanding at redemption value at june 30, 2021 and december 31, 2020, respectively
                        8,980,000                                                          
        treasury common stock at cost, 78,900 shares at june 30, 2021 and december 31, 2020
                        -2,722,000                                                          
        total revenue
                            89,563,000                                                      
        expenses
                                                                                  
        operating
                            33,704,000                                                      
        depreciation and amortization
                            37,390,000                                                      
        total expenses
                            71,094,000                                                      
        other income
                                                                                  
        interest expense
                            -23,306,000                                                      
        gains on sales of real estate
                            11,720,000                                                      
        net income
                            6,883,000                                                      
        company’s share of net income
                            4,024,000                                                      
        basis differential
                            -2,192,000                                                      
        income from unconsolidated joint ventures
                            1,832,000                                                      
        redeemable deferred stock units— 60,676 units outstanding at redemption value at december 31, 2019
                              8,365,000                                                    
        treasury common stock at cost, 78,900 shares at december 31, 2019 and december 31, 2018
                              -2,722,000                                                    
        treasury common stock at cost, 78,900 shares at december 31, 2018 and december 31, 2017
                                  -2,722,000                                                
        treasury common stock at cost, 78,900 shares at september 30, 2018 and december 31, 2017
                                   -2,722,000                                               
        treasury common stock at cost, 78,900 shares at june 30, 2018 and december 31, 2017
                                    -2,722,000                                              
        treasury common stock at cost, 78,900 shares at march 31, 2018 and december 31, 2017
                                     -2,722,000                                             
        less: accumulated depreciation (amounts related to vies of (854,172) and (758,640) at december 31, 2017 and 2016, respectively
                                      -4,589,634,000                                            
        mezzanine notes payable
                                         306,734,000 307,448,000 307,797,000 308,142,000 308,482,000 308,817,000 309,148,000 309,475,000 309,796,000 310,114,000 310,427,000 310,735,000 311,040,000 311,340,000 311,637,000                           
        outside members’ notes payable
                                         180,000,000 180,000,000   180,000,000  180,000,000 180,000,000 180,000,000 180,000,000 180,000,000 180,000,000 180,000,000                             
        treasury common stock at cost, 78,900 shares at december 31, 2017 and december 31, 2016
                                      -2,722,000                                            
        common units of the operating partnership
                                      604,739,000    608,280,000 612,385,000 616,095,000 603,092,000 620,036,000 614,988,000 617,274,000 603,171,000 606,002,000 601,775,000 575,381,000 576,333,000 577,173,000 570,135,000 540,103,000 539,753,000 568,147,000 573,241,000 557,930,000 548,581,000 559,621,000 579,211,000 594,002,000 592,164,000 609,454,000 619,224,000 622,263,000 617,386,000 620,460,000 620,752,000 568,849,000          
        treasury common stock at cost, 78,900 shares at september 30, 2017 and december 31, 2016
                                       -2,722,000                                           
        treasury common stock at cost, 78,900 shares at june 30, 2017 and december 31, 2016
                                        -2,722,000                                          
        treasury common stock at cost, 78,900 shares at march 31, 2017 and december 31, 2016
                                         -2,722,000                                         
        treasury common stock at cost, 78,900 shares at september 30, 2016 and december 31, 2015
                                          -2,722,000                                        
        construction in progress
                                           865,359,000 857,578,000  725,601,000 880,996,000 797,148,000  715,609,000 1,309,781,000 1,564,821,000  1,502,017,000 1,483,114,000 1,145,517,000  937,475,000 732,734,000 870,006,000                      
        land held for future development
                                           241,106,000 256,952,000  264,598,000 277,327,000 271,327,000  276,804,000 273,587,000 300,498,000  295,370,000 290,085,000 503,684,000  273,922,000 270,169,000 268,030,000  266,834,000 284,115,000 759,786,000  754,120,000 732,006,000 730,201,000  241,617,000 240,377,000 239,765,000  253,891,000 253,313,000 266,555,000  212,801,000 189,698,000 185,093,000  
        outside members' notes payable
                                           180,000,000 180,000,000  180,000,000                                    
        treasury common stock at cost, 78,900 shares at june 30, 2016 and december 31, 2015
                                           -2,722,000                                       
        treasury common stock at cost, 78,900 shares at march 31, 2016 and december 31, 2015
                                            -2,722,000                                      
        redeemable preferred units of the operating partnership
                                                633,000 633,000 2,022,000 18,006,000 51,312,000 51,312,000 67,806,000 110,876,000 110,876,000 110,876,000 110,876,000 51,537,000 51,537,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000 55,652,000          
        redeemable interest in property partnership
                                               106,233,000 105,520,000 104,692,000 104,105,000 103,778,000 100,327,000 99,609,000 98,649,000 98,162,000 98,216,000 97,558,000                         
        excess stock, .01 par value...
                                                                                  
        preferred stock, .01 par value...
                                                 200,000,000    200,000,000                             
        5.25% series b cumulative redeemable preferred stock, .01 par value...
                                             200,000,000 200,000,000 200,000,000 200,000,000  200,000,000 200,000,000 200,000,000  200,000,000 200,000,000 200,000,000                          
        common stock, .01 par value...
                                             1,536,000 1,536,000 1,535,000 1,534,000 1,531,000 1,531,000 1,531,000 1,530,000 1,530,000 1,524,000 1,524,000 1,516,000 1,516,000 1,509,000 1,507,000 1,494,000 1,481,000 1,476,000 1,464,000 1,451,000 1,402,000 1,401,000 1,393,000 1,390,000 1,389,000 1,387,000 1,385,000 1,213,000 1,212,000 1,199,000 1,198,000 1,197,000 1,195,000 1,193,000 1,190,000 1,190,000 1,175,000 
        treasury common stock at cost, 78,900 shares at december 31, 2015 and december 31, 2014
                                             -2,722,000                                     
        treasury common stock at cost, 78,900 shares at september 30, 2015 and december 31, 2014
                                              -2,722,000                                    
        treasury common stock at cost, 78,900 shares at june 30, 2015 and december 31, 2014
                                               -2,722,000                                   
        treasury common stock at cost, 78,900 shares at march 31, 2015 and december 31, 2014
                                                -2,722,000                                  
        treasury common stock at cost, 78,900 shares at december 31, 2014 and december 31, 2013
                                                 -2,722,000                                 
        treasury common stock at cost, 78,900 shares at september 30, 2014 and december 31, 2013
                                                  -2,722,000                                
        treasury common stock at cost, 78,900 shares at june 30, 2014 and december 31, 2013
                                                   -2,722,000                               
        treasury common stock at cost, 78,900 shares at march 31, 2014 and december 31, 2013
                                                    -2,722,000                              
        interest receivable from related party notes receivable
                                                        106,313,000 104,816,000 102,122,000 98,866,000 95,126,000 89,854,000                     
        treasury common stock at cost, 78,900 shares at december 31, 2013 and december 31, 2012
                                                     -2,722,000                             
        related party notes payable
                                                      180,000,000 180,000,000                           
        earnings
                                                      246,206,000 192,492,000          -24,763,000                 
        treasury common stock at cost, 78,900 shares at september 30, 2013 and december 31, 2012
                                                      -2,722,000                            
        treasury common stock at cost, 78,900 shares at june 30, 2013 and december 31, 2012
                                                       -2,722,000                           
        real estate held for sale
                                                        37,909,000                        18,282,000  
        treasury common stock at cost, 78,900 shares at march 31, 2013 and december 31, 2012
                                                        -2,722,000                          
        treasury common stock at cost, 78,900 shares at december 31, 2012 and december 31, 2011
                                                         -2,722,000                         
        noncontrolling interest:
                                                                                  
        treasury common stock at cost, 78,900 shares at september 30, 2012 and december 31, 2011
                                                          -2,722,000                        
        treasury common stock at cost, 78,900 shares at june 30, 2012 and december 31, 2011
                                                           -2,722,000                       
        treasury common stock at cost, 78,900 shares at march 31, 2012 and december 31, 2011
                                                            -2,722,000                      
        real estate, at cost:
                                                             13,389,472,000    12,764,935,000    11,099,558,000    10,618,344,000    10,249,895,000    9,552,458,000 
        stockholders’ equity attributable to boston properties, inc.
                                                                                  
        treasury common stock at cost, 78,900 shares at december 31, 2011 and 2010
                                                             -2,722,000                     
        construction in process
                                                              899,302,000 982,318,000 681,342,000  1,003,508,000 632,731,000 662,809,000  976,758,000 934,397,000 916,220,000  813,404,000 735,372,000 619,165,000  629,138,000 584,620,000 500,995,000  
        interest receivable from related party note receivable
                                                              84,782,000 79,884,000 75,280,000                  
        treasury common stock at cost, 78,900 shares at september 30, 2011 and december 31, 2010
                                                              -2,722,000                    
        treasury common stock at cost, 78,900 shares at june 30, 2011 and december 31, 2010
                                                               -2,722,000                   
        treasury common stock at cost, 78,900 shares at march 31, 2011 and december 31, 2010
                                                                -2,722,000                  
        investment in securities
                                                                 8,732,000    9,946,000    11,590,000    22,584,000     
        treasury common stock at cost, 78,900 shares in 2010 and 2009
                                                                 -2,722,000 -2,722,000 -2,722,000 -2,722,000              
        earnings in excess of dividends
                                                                  58,051,000 70,426,000 78,645,000 95,433,000 111,463,000 115,027,000 117,082,000 192,843,000 366,482,000 399,502,000 401,410,000 394,324,000 1,065,993,000 904,417,000 881,733,000 108,155,000 
        treasury common stock at cost, 78,900 shares in 2009 and 2008
                                                                     -2,722,000 -2,722,000 -2,722,000 -2,722,000          
        liabilities and stockholders' equity
                                                                                  
        minority interests
                                                                         598,627,000 639,171,000 663,313,000 654,512,000 653,892,000 753,620,000 731,043,000 726,937,000 623,508,000 
        stockholders' equity:
                                                                                  
        treasury common stock at cost, 78,900 shares in 2008 and 2007
                                                                         -2,722,000 -2,722,000 -2,722,000 -2,722,000      
        total stockholders' equity
                                                                         3,531,267,000    3,668,825,000     
        total liabilities and stockholders' equity
                                                                         10,911,645,000    11,192,637,000     
        liabilities and stockholders’ equity
                                                                                  
        stockholders’ equity:
                                                                                  
        total stockholders’ equity
                                                                          3,644,872,000 3,697,997,000 3,664,437,000  4,347,882,000 4,163,344,000 4,137,609,000 3,223,226,000 
        total liabilities and stockholders’ equity
                                                                          10,873,334,000 10,387,925,000 10,349,487,000  10,985,621,000 10,994,602,000 11,085,740,000 9,695,022,000 
        treasury common stock at cost, 78,900 shares in 2007 and 2006
                                                                             -2,722,000 -2,722,000 -2,722,000 -2,722,000  
        treasury common stock at cost, 78,900 shares in 2006 and 2005
                                                                                 -2,722,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 
                                                                                   
          cash flows from operating activities:
                                                                                   
          net income
        294,789,000 -116,840,000 119,141,000 86,905,000 -237,817,000 108,452,000 106,949,000 106,604,000 153,155,000 -103,543,000 136,184,000 105,628,000 155,723,000 420,661,000 267,243,000 176,957,000 223,285,000 139,250,000 141,250,000 128,147,000 24,905,000 118,060,000 298,580,000 577,146,000 176,009,000 141,370,000 203,461,000 131,159,000 185,241,000 150,445,000 160,565,000 216,312,000 132,203,000 147,704,000 167,010,000 115,564,000 71,504,000 117,357,000 216,222,000 166,738,000 323,271,000 100,739,000 209,170,000 211,425,000 150,975,000 95,901,000 67,756,000 106,312,000 170,436,000 506,761,000 57,931,000 57,280,000 66,103,000 134,746,000 74,010,000 115,443,000 80,451,000 69,738,000 48,194,000 -12,756,000 68,089,000 72,487,000 62,507,000 62,746,000 77,650,000 80,073,000 54,030,000         
          adjustments to reconcile net income to net cash from operating activities:
                                                                                   
          depreciation and amortization
        232,015,000 236,147,000 223,819,000 220,107,000 226,043,000 222,890,000 219,542,000 218,716,000 212,067,000 207,435,000 202,577,000 208,734,000 198,330,000 190,675,000 183,146,000 177,624,000 177,521,000 179,412,000 183,838,000 176,565,000 168,013,000 166,456,000 178,188,000 171,094,000 169,897,000 165,862,000 177,411,000 164,594,000 165,439,000 157,996,000 156,417,000 165,797,000 154,259,000 152,164,000 151,919,000 159,205,000 203,748,000 153,175,000 159,448,000 164,460,000 153,015,000 167,844,000 154,223,000 162,430,000 157,245,000 154,628,000 154,270,000 155,409,000 154,193,000 134,604,000 121,191,000 121,061,000 111,360,000 111,886,000 109,737,000 109,181,000 109,495,000 111,080,000 109,428,000 92,763,000 81,133,000 81,400,000 83,075,000 79,125,000 78,181,000 87,005,000 77,370,000 79,766,000 75,321,000 74,389,000 74,671,000 71,655,000 71,616,000 74,621,000 71,086,000 
          impairment losses
        16,902,000                                                                           
          amortization of right of use assets - operating leases
        -35,000 10,000 86,000 203,000 543,000 -66,000 344,000 1,441,000 438,000 573,000 277,000 652,000 584,000 436,000 878,000 529,000 308,000 245,000 700,000 2,263,000 567,000 539,000 545,000 583,000  608,000 608,000 605,000                                                
          amortization of sales type lease
        -240,000 -236,000 -232,000 -281,000 -254,000 -250,000                                                                      
          non-cash compensation expense
        4,771,000 4,703,000 11,943,000 22,917,000 4,397,000 4,365,000 16,314,000 18,873,000 4,779,000 5,175,000 15,262,000 26,262,000 7,818,000 8,013,000 14,960,000 21,235,000 7,762,000 8,728,000 14,280,000 20,090,000 7,990,000 8,253,000 10,374,000 17,525,000 7,705,000 7,809,000 10,394,000 15,050,000 8,417,000 8,457,000 8,471,000 14,772,000 8,101,000 8,023,000 8,435,000 10,802,000 7,643,000 7,578,000 10,069,000 6,358,000 6,345,000 5,469,000 11,011,000 5,391,000 5,809,000 6,519,000 10,380,000 6,154,000 6,537,000 6,681,000 25,783,000 4,820,000 6,746,000 6,755,000 11,358,000 5,970,000 5,937,000 5,909,000 11,856,000 6,127,000 6,380,000 6,334,000 14,011,000 6,500,000 6,483,000 6,559,000 7,094,000 5,572,000 6,470,000 5,631,000 5,433,000 3,040,000 3,047,000 3,057,000 3,214,000 
          loss from unconsolidated joint ventures
        -50,232,000 148,329,000 3,324,000 2,139,000 349,553,000 7,011,000 5,799,000 -19,186,000 -22,250,000                                                                   
          distributions of net cash flow from operations of unconsolidated joint ventures
        12,974,000 19,593,000 8,804,000 17,053,000 6,529,000 6,179,000 12,510,000 8,643,000 2,766,000 10,434,000 5,441,000 5,996,000 6,316,000 10,414,000 3,712,000 6,385,000 3,080,000 4,075,000 10,415,000 3,972,000 9,607,000 8,903,000 7,465,000 5,917,000 385,000 12,880,000 1,240,000 2,650,000 2,715,000 2,325,000 816,000 847,000 18,295,000 5,658,000 1,044,000 1,861,000 246,000 681,000 10,718,000 1,985,000 715,000 4,419,000 1,350,000 4,242,000 925,000 774,000 1,431,000 2,993,000 3,918,000 12,768,000 12,921,000 14,643,000 12,169,000 11,218,000 8,972,000 12,629,000 9,780,000 9,779,000 7,663,000 7,545,000 4,515,000 3,774,000 900,000 4,800,000 1,971,000 4,055,000 1,850,000         
          gains from investments in securities
        -846,000 -2,400,000    -2,198,000 -315,000 -2,272,000         -1,882,000         -106,000    -1,075,000    -944,000 -730,000 -1,042,000  -478,000 -259,000   24,000 -393,000 -387,000 297,000 -662,000 -286,000  -956,000 -181,000 -735,000   186,000 -801,000    -373,000                 
          allowance for current expected credit losses
        -1,110,000 -17,000 17,000 -23,000 34,000 8,000 32,000 4,000 71,000 38,000 219,000 45,000 252,000 -18,000 -224,000 -234,000 -449,000 -340,000 -290,000 -128,000 -148,000 1,513,000                                                      
          non-cash portion of interest expense
        8,198,000 7,123,000 7,669,000 9,257,000 11,568,000 11,403,000 2,063,000 12,109,000 7,982,000 7,601,000 7,553,000 7,387,000 6,127,000 7,176,000 6,568,000 5,960,000 5,784,000 5,800,000 5,800,000 5,984,000 5,987,000 5,914,000 5,837,000 5,646,000 5,660,000 5,694,000 5,453,000 5,447,000 5,381,000 5,315,000 5,308,000 5,299,000 5,383,000 5,312,000 -4,250,000 -7,729,000 -8,056,000 -9,192,000 -10,138,000 -9,453,000 -10,966,000 -10,968,000 -10,884,000 -10,590,000 -10,582,000 -10,495,000 -7,676,000 -26,500,000 9,029,000 9,559,000 10,561,000 10,462,000 10,788,000 10,042,000 11,839,000 13,946,000 14,002,000 13,580,000 13,434,000 13,975,000 13,605,000 17,670,000 10,924,000 14,353,000 14,156,000 13,549,000 13,606,000 3,862,000 2,908,000 2,440,000 2,360,000 2,340,000 2,259,000 2,492,000 2,306,000 
          loss from early extinguishments of debt
        338,000                                                                        
          gains on sales of real estate
        -156,410,000    -85,000       -55,726,000 -262,345,000 -96,247,000 -22,701,000 -115,556,000 -348,000   -5,259,000 209,000   57,000 15,000   -59,804,000 -7,863,000 -18,292,000 -96,397,000 -872,000 -2,891,000 -3,767,000 -133,000 -12,983,000 -67,623,000 -81,332,000 -199,479,000 -95,084,000 -126,102,000                -969,000 -1,765,000  -2,394,000 -4,493,000 -2,795,000  -1,753,000 -6,203,000 -23,438,000  -198,201,000 -13,829,000 -922,378,000 
          loss on sales-type lease
        2,490,000                                                                        
          unrealized loss on non-real estate investments
        2,000 -178,000 39,000 483,000                                                                        
          change in assets and liabilities:
                                                                                   
          tenant and other receivables
        37,358,000 -9,187,000 2,433,000 1,903,000 -10,216,000 -15,811,000 10,289,000 29,454,000 -18,003,000 -17,188,000 -3,797,000 7,518,000 -11,754,000 -6,034,000 -7,468,000 17,635,000 -8,918,000 -3,372,000 -8,910,000 26,020,000 4,007,000 27,000 732,000 17,784,000 -4,199,000 -9,163,000 2,486,000 -14,000,000 27,626,000 -31,434,000 10,222,000 22,790,000 -10,095,000 10,495,000 -16,990,000 19,023,000 8,172,000 -11,055,000 25,018,000 -26,475,000 -11,263,000 -7,415,000 -1,173,000 -3,385,000 8,138,000 -13,536,000 21,652,000 -4,071,000 10,646,000 -17,708,000 10,690,000 -5,525,000 -1,440,000 7,434,000 22,686,000 -32,493,000 -3,249,000 10,273,000 6,073,000 -8,037,000 -7,626,000 10,815,000 -267,000 -16,027,000 12,157,000 -1,826,000 7,540,000 -7,316,000 -7,794,000 -5,721,000 23,494,000 -15,194,000 5,199,000 2,401,000 6,253,000 
          accrued rental income
        -19,765,000 -30,891,000 -23,044,000 -28,178,000 -19,033,000 -25,986,000 -16,645,000 -35,945,000 -27,349,000 -29,225,000 -24,346,000 -18,619,000 -21,807,000 -27,367,000 -19,334,000 -29,567,000 -27,265,000 -34,849,000 -30,021,000 -9,413,000 -11,256,000 -42,444,000 -16,114,000 -27,285,000 -37,490,000 18,146,000 -21,903,000 -15,570,000 -2,143,000 4,240,000 -19,440,000 -26,319,000 -22,343,000 -16,664,000 -10,190,000 -9,158,000 -9,324,000 7,687,000 -12,981,000 -17,970,000 -15,768,000 -16,923,000 -23,250,000 -15,719,000 -20,196,000 -11,857,000 -10,127,000 -15,336,000 -15,509,000 -14,832,000 -14,295,000 -17,858,000 -19,907,000 -20,332,000 -19,266,000 -13,837,000 -16,960,000 -28,761,000 -20,434,000 -21,675,000 -19,954,000 -24,112,000 -13,821,000 -9,412,000 -13,586,000 -8,886,000 -14,526,000 -4,184,000 9,738,000 -13,138,000 -12,417,000 -8,005,000 -8,693,000 -8,585,000 -13,020,000 
          prepaid expenses and other assets
        67,086,000 -48,959,000 51,635,000 -73,910,000 67,831,000 -56,230,000 57,720,000 -74,705,000 69,285,000 -51,863,000 73,004,000 -97,762,000 66,203,000 -52,430,000 78,057,000 -71,731,000 40,208,000 -46,897,000 82,229,000 -96,351,000 72,853,000 -48,308,000 81,762,000 -93,819,000 66,822,000 -54,538,000 59,235,000 -68,554,000 64,410,000 -47,297,000 62,327,000 -66,968,000 65,058,000 -49,856,000 57,420,000 -21,197,000 -57,869,000 17,192,000 45,560,000 -37,865,000 -42,557,000 60,098,000 3,447,000 55,042,000 -86,246,000 45,453,000 5,989,000 54,211,000 -58,953,000 -976,000 18,684,000 36,890,000 -68,518,000 31,635,000 6,983,000 27,384,000 -60,092,000 22,927,000 -29,432,000 27,346,000 -19,406,000 28,613,000 -33,314,000 24,293,000 -19,072,000 24,759,000 -25,263,000 21,638,000 -17,528,000 22,346,000 -29,098,000 24,886,000 -7,927,000 16,755,000 -23,028,000 
          right of use assets - operating lease
            -750,000                                                                   
          lease liabilities - operating leases
        -3,204,000 -540,000 361,000 -162,000 188,000 607,000 244,000 -1,241,000 -403,000 142,000 391,000 -251,000 -322,000 365,000 -34,000 116,000 424,000 -22,457,000 -236,000 -1,330,000 376,000 358,000 406,000 393,000 425,000 411,000 410,000 370,000                                                
          accounts payable and accrued expenses
        -15,645,000 30,673,000 26,797,000 -14,664,000 -9,991,000 32,246,000 -3,925,000 -20,725,000 782,000 34,594,000 14,825,000 -8,505,000 -25,944,000 21,803,000 13,164,000 -31,800,000 -6,072,000 19,997,000 27,678,000 -21,578,000 -12,332,000 28,766,000 28,098,000 -48,591,000 -19,840,000 15,009,000 17,200,000 258,000 -5,001,000 16,253,000 4,014,000 -13,913,000 2,621,000 10,469,000 13,698,000 -16,306,000 7,616,000 14,445,000 -5,209,000 -3,373,000 3,036,000 -438,000 -5,535,000 -334,000 8,941,000 -5,992,000 1,288,000 3,929,000 7,780,000 2,571,000 -1,172,000 141,000 6,423,000 -4,273,000 1,563,000 1,319,000 5,172,000 9,303,000 -9,134,000 -2,119,000 3,701,000 -10,899,000 -23,522,000 6,054,000 1,386,000 7,631,000 -223,000 -7,225,000 13,825,000 9,703,000 -10,541,000 -3,059,000 7,692,000 5,711,000 -6,511,000 
          accrued interest payable
        5,219,000 -846,000 544,000 -7,660,000 6,736,000 9,254,000 -7,466,000 -14,171,000 5,262,000 17,334,000 -3,312,000 10,626,000 11,889,000 -4,936,000 5,969,000 -3,933,000 7,398,000 -19,978,000 30,711,000 -28,970,000 17,413,000 -6,464,000 12,906,000 -7,644,000 6,962,000 -6,026,000 82,000 -160,000 -3,623,000 -4,139,000 600,000 12,399,000 -15,688,000 13,928,000 -181,542,000 22,781,000 12,453,000 597,000 31,192,000 -10,530,000 22,368,000 -8,082,000 23,098,000 -18,422,000 25,930,000 -22,627,000 11,128,000 -13,787,000 33,067,000 -28,136,000 30,158,000 -28,321,000 36,654,000 -36,050,000 31,073,000 -20,450,000 27,509,000 -26,024,000 25,743,000 -22,362,000 4,168,000 11,355,000 -6,892,000 26,522,000 -16,927,000 16,134,000 -16,803,000 18,427,000 -7,274,000 8,624,000 -7,132,000 7,816,000 -12,434,000 10,188,000 1,476,000 
          other liabilities
        21,737,000 716,000 -29,724,000 -11,862,000 40,405,000 5,343,000 -20,076,000 -12,846,000 13,521,000 15,519,000 -38,338,000 16,565,000 11,370,000 2,242,000 -25,586,000 -12,146,000 23,199,000 1,981,000 -29,742,000 -24,177,000 42,497,000 -2,956,000 -616,000 -21,296,000 28,880,000 -47,946,000 -12,672,000 -17,831,000 6,516,000 -13,132,000 -11,518,000 23,089,000 20,117,000 -31,938,000 -26,003,000 -7,090,000 -42,516,000 -38,486,000 -33,319,000 39,365,000 -16,790,000 -33,444,000 -23,136,000 2,922,000 -21,542,000 -17,056,000 -22,197,000 11,425,000 10,734,000 -12,383,000 -7,703,000 8,293,000 650,000 -16,472,000 8,883,000 22,233,000 12,853,000 -22,577,000 -5,940,000 10,605,000 9,491,000 -19,471,000 -10,018,000 -1,577,000 7,027,000 -2,508,000 -12,394,000 10,108,000 -18,500,000 -31,712,000 -13,919,000 13,663,000 -4,093,000 -2,950,000 -1,302,000 
          tenant leasing costs
        -45,812,000 -29,945,000 -29,477,000 -17,384,000 -57,301,000 -19,212,000 -12,822,000 -29,627,000 -11,803,000 -18,212,000 -11,740,000 -35,911,000 -25,510,000 -17,986,000 -25,657,000 -14,904,000 -25,232,000 -10,509,000 -10,494,000 -16,615,000 -27,151,000 -15,553,000 -19,291,000 -17,777,000 -41,160,000 -23,607,000 -34,095,000 -18,420,000 -41,376,000 -34,623,000 -23,148,000 -31,595,000 -36,730,000 -30,447,000 -13,621,000 -23,631,000 -21,757,000 -20,788,000 -19,867,000 -34,974,000 -12,418,000 -15,396,000 -27,608,000 -35,429,000 -18,658,000 -28,424,000 -16,565,000 -19,278,000 -17,295,000 -10,923,000 -8,932,000 -35,024,000 -17,942,000 -15,922,000 -7,933,000 -12,426,000 -19,854,000 -11,775,000 -9,157,000 -30,262,000 -11,561,000 -8,087,000 -9,603,000 -23,181,000 -10,010,000 -7,933,000 -5,156,000 -16,283,000 -9,299,000 -11,696,000 -20,531,000 -14,171,000 -9,436,000 -6,406,000 -4,754,000 
          total adjustments
        112,963,000 391,064,000 234,004,000 123,131,000 621,563,000 177,644,000 260,115,000 90,991,000 233,993,000 404,732,000 242,989,000 128,382,000 214,273,000 -124,897,000 129,906,000 42,533,000 123,083,000 87,133,000 267,163,000 23,916,000 349,512,000 110,091,000 80,495,000 -401,949,000 185,364,000 112,818,000 154,909,000 76,075,000 194,377,000 59,336,000 174,503,000 9,466,000 182,530,000 72,730,000 -41,262,000 130,966,000 88,130,000 117,814,000 132,758,000 23,795,000 -157,469,000 140,891,000 -7,724,000 14,451,000 9,709,000 88,883,000 56,453,000 121,193,000 45,147,000 -409,352,000 179,498,000 121,983,000 66,503,000 27,073,000 95,251,000 48,026,000 72,307,000 88,079,000 84,090,000 55,795,000 54,261,000 77,923,000 -2,413,000 106,714,000 53,329,000 126,728,000 56,106,000 289,183,000 65,118,000 67,022,000 14,353,000 52,037,000 -101,275,000 83,057,000 -729,131,000 
          net cash from operating activities
        407,752,000 274,224,000 353,145,000 210,036,000 383,746,000 286,096,000 367,064,000 197,595,000 387,148,000 301,189,000 379,173,000 234,010,000 369,996,000 295,764,000 397,149,000 219,490,000 346,368,000 226,383,000 408,413,000 152,063,000 374,417,000 228,151,000 379,075,000 175,197,000 361,373,000 254,188,000 358,370,000 207,234,000 379,618,000 209,781,000 335,068,000 225,778,000 314,733,000 220,434,000 125,748,000 246,530,000 159,634,000 235,171,000 348,980,000 190,533,000 165,802,000 241,630,000 201,446,000 225,876,000 160,684,000 184,784,000 124,209,000 227,505,000 215,583,000 97,409,000 237,429,000 179,263,000 132,606,000 161,819,000 169,261,000 163,469,000 152,758,000 157,817,000 132,284,000 43,039,000 122,350,000 150,410,000 60,094,000 169,460,000 130,979,000 206,801,000 110,136,000 197,949,000 113,597,000 146,548,000 102,814,000 176,255,000 141,267,000 186,680,000 125,176,000 
          capital expenditures
          free cash flows
        407,752,000 274,224,000 353,145,000 210,036,000 383,746,000 286,096,000 367,064,000 197,595,000 387,148,000 301,189,000 379,173,000 234,010,000 369,996,000 295,764,000 397,149,000 219,490,000 346,368,000 226,383,000 408,413,000 152,063,000 374,417,000 228,151,000 379,075,000 175,197,000 361,373,000 254,188,000 358,370,000 207,234,000 379,618,000 209,781,000 335,068,000 225,778,000 314,733,000 220,434,000 125,748,000 246,530,000 159,634,000 235,171,000 348,980,000 190,533,000 165,802,000 241,630,000 201,446,000 225,876,000 160,684,000 184,784,000 124,209,000 227,505,000 215,583,000 97,409,000 237,429,000 179,263,000 132,606,000 161,819,000 169,261,000 163,469,000 152,758,000 157,817,000 132,284,000 43,039,000 122,350,000 150,410,000 60,094,000 169,460,000 130,979,000 206,801,000 110,136,000 197,949,000 113,597,000 146,548,000 102,814,000 176,255,000 141,267,000 186,680,000 125,176,000 
          cash flows from investing activities:
                                                                                   
          acquisitions of real estate
                    -592,438,000 -724,255,000 -3,580,000 -3,581,000 -118,503,000   -2,278,000 -2,292,000   -119,000                     -233,084,000 -289,816,000 -99,979,000 -66,714,000 -621,359,000 -71,080,000   -41,100,000                 
          construction in progress
        -183,213,000 -221,870,000 -139,871,000 -138,796,000 -181,398,000 -156,346,000 -131,966,000 -181,636,000 -164,338,000 -126,294,000 -115,649,000 -119,682,000 -116,190,000 -146,901,000 -136,869,000 -100,313,000 -132,774,000 -145,527,000 -116,081,000 -119,496,000 -123,683,000 -111,209,000 -104,455,000 -143,160,000 -155,785,000 -187,016,000 -117,627,000 -85,632,000 -164,402,000 -149,824,000 -230,505,000 -150,060,000 -156,121,000 -154,536,000 -143,229,000 -154,518,000 -116,772,000 -120,004,000 -122,940,000 -122,680,000 -97,554,000 -94,417,000 -60,013,000 -100,750,000 -98,589,000 -109,578,000 -97,025,000 -117,049,000 -98,730,000 -77,878,000 -103,178,000 -117,770,000 -86,079,000 -58,891,000 -93,657,000  -68,322,000 -72,381,000 -64,877,000                 
          building, pre-development and other capital improvements
        -45,027,000 -42,629,000                                                                          
          tenant improvements
        -95,614,000 -103,446,000 -79,410,000 -60,338,000 -79,477,000 -60,987,000 -64,471,000 -53,377,000 -66,084,000 -109,098,000 -68,568,000 -67,175,000 -78,699,000 -42,142,000 -42,676,000 -55,168,000 -45,074,000 -57,259,000 -68,418,000 -93,201,000 -62,022,000 -53,498,000 -54,731,000 -64,172,000 -60,299,000 -75,592,000 -61,698,000 -54,242,000 -80,584,000 -45,468,000 -36,825,000 -47,157,000 -52,582,000 -45,216,000 -56,723,000 -50,810,000 -50,827,000 -61,196,000 -55,739,000 -58,520,000 -34,608,000 -24,494,000 -26,950,000 -25,311,000 -26,757,000 -22,384,000 -31,551,000 -26,963,000 -22,474,000 -31,000,000 -24,988,000 -31,562,000 -35,314,000 -37,874,000 -34,912,000 -25,920,000 -22,110,000 -14,039,000 -14,251,000                 
          proceeds from sales of real estate
            85,000       139,539,000 537,886,000 121,948,000 35,397,000     13,624,000 -658,000 246,848,000 259,489,000 7,338,000 23,088,000 40,379,000 20,019,000 279,832,000 34,328,000 25,129,000 116,120,000 12,761,000 16,916,000 133,000 17,934,000 104,816,000 213,143,000 194,636,000 194,821,000                                 
          acquisition of real estate upon consolidation of unconsolidated joint ventures
                                                                                   
          capital contributions to unconsolidated joint ventures
        -140,228,000 -34,092,000 -31,821,000 -52,611,000 -44,598,000 -27,037,000 -34,004,000 -26,457,000 -43,775,000 -45,280,000 -42,850,000 -60,745,000 -167,938,000 -39,824,000 -43,526,000 -26,293,000 -2,690,000 -75,430,000 -3,348,000 -16,684,000 -14,062,000 -52,206,000 -16,171,000 -89,997,000 -21,893,000 -15,431,000 -23,073,000 -26,995,000 -31,642,000 -248,825,000 -16,427,000 -48,823,000 -19,141,000 -48,383,000 -23,511,000 -17,980,000 -520,942,000 -15,825,000 -10,215,000 -17,344,000 -5,874,000 -12,545,000 -2,444,000 -4,285,000      -113,000 -5,847,000 -42,000 -278,000 -47,000 -103,000 -1,151,000 -15,484,000 -1,232,000 -1,380,000 -321,000               
          capital distributions from unconsolidated joint ventures
        143,451,000        25,437,000   500,000 16,527,000 20,095,000 122,000 175,000 710,000   31,807,000             24,527,000 850,000 284,000 244,000 113,000 2,795,000 21,885,000   500,000 3,000,000 57,000     22,752,000 2,160,000               
          investment in non-real estate investments
        -1,478,000 -630,000 -996,000 -434,000 -1,000,000 -875,000   -197,000 -1,257,000 -733,000                                                                
          issuance of note receivables
        -18,835,000 -2,226,000 -1,200,000 -600,000 -1,035,000 -800,000 -850,000 -573,000                                                                    
          proceeds from note receivables
                                                                                   
          investments in securities
        -164,000 -142,000 -167,000 1,031,000 -889,000 -143,000 -257,000 1,425,000 -283,000 -253,000 189,000 1,843,000 -141,000 -154,000 -141,000 5,338,000 -233,000 -231,000 -199,000 2,114,000 -227,000 -228,000 -195,000 3,201,000 -195,000 -858,000 -194,000 -885,000 -141,000 -238,000 -205,000 -318,000 -218,000 -256,000 -234,000 -961,000 -271,000 -220,000 -438,000 -242,000 -207,000 -241,000 -884,000 -238,000 -204,000 -239,000 -1,099,000 -225,000 -195,000 -220,000 -918,000 -193,000 -169,000 -29,000 -844,000 -198,000 -197,000 -169,000 -695,000                 
          net cash from investing activities
        343,702,000 -375,824,000 -303,261,000 -309,143,000 -386,609,000 -297,283,000 -266,885,000 -286,619,000 -318,103,000 -320,714,000 -269,272,000 -285,592,000 -289,582,000 -333,050,000 -828,835,000 -151,335,000 -41,588,000 -434,757,000 -321,338,000 -242,273,000 -225,308,000 -267,889,000 -46,729,000 -73,793,000 -278,625,000 -408,514,000 -104,437,000 -223,515,000 -78,809,000 -534,266,000 -302,013,000 -183,788,000 -275,387,000 -82,957,000 -276,877,000 -262,593,000 -678,792,000 -316,235,000 -109,357,000 -679,027,000 219,636,000 176,440,000 2,725,000 -176,868,000 -141,685,000 -199,499,000 -147,072,000 -79,195,000 -1,143,000 -19,311,000 -432,991,000 -257,920,000 -213,698,000 -46,304,000 -760,110,000 -59,694,000 159,704,000 -69,077,000 -121,029,000 -385,568,000 -490,140,000 -132,620,000 -152,946,000 -118,316,000 -129,320,000 -106,051,000 -92,914,000 -102,559,000 -582,730,000 -720,747,000 90,360,000 -476,778,000 176,078,000 -67,845,000 945,476,000 
          bxp, inc.consolidated statements of cash flows
                                                                                   
          cash flows from financing activities:
                                                                                   
          proceeds from mortgage notes payable
                                                             725,000,000   267,500,000 1,464,000 5,774,000 67,110,000 18,621,000 16,424,000 400,638,000 30,469,000 41,230,000 65,232,000 77,153,000 25,890,000 55,586,000 938,740,000 
          repayments of mortgage notes payable
        -1,056,000 -1,043,000 -1,030,000 -1,122,000 -1,319,000 -1,442,000 -1,215,000 -804,000         -819,035,000 -3,967,000 -3,920,000 -5,374,000 -4,373,000 -4,318,000 -4,265,000 -4,212,000 -30,663,000 -5,808,000 -4,057,000 -5,645,000 -3,957,000 -5,485,000 -3,859,000 -5,333,000 -3,763,000 -5,182,000 -1,303,670,000 -5,038,000 -1,100,749,000 -216,270,000 -6,265,000 -34,664,000 -7,228,000 -5,885,000 -7,024,000 -5,728,000 -69,823,000 -5,577,000 -6,630,000 16,439,000 -16,885,000 -56,178,000 -23,687,000 -5,573,000 -28,439,000 -69,346,000 -150,519,000 -55,767,000 -727,435,000 -459,862,000 -8,777,000 -428,660,000 -265,343,000 -28,957,000 -7,231,000 -5,970,000 -27,210,000 -84,697,000 -7,361,000 -22,695,000 -283,266,000 -266,354,000 -30,739,000 -74,483,000 -237,386,000 -173,085,000 -711,664,000 
          proceeds from unsecured senior notes
                     849,651,000 846,345,000   699,678,000           992,710,000 997,080,000                 843,710,000               
          repayment / redemption of unsecured senior notes
        -850,000,000 -700,000,000                                                                   
          proceeds from unsecured exchangeable senior notes
                                                                             840,363,000 
          borrowings on unsecured line of credit
        345,000,000 160,000,000 360,000,000         100,000,000 545,000,000 150,000,000 190,000,000 470,000,000    265,000,000 330,000,000 50,000,000 165,000,000 235,000,000 85,000,000 260,000,000 110,000,000 40,000,000 255,000,000 175,000,000                                200,000,000 562,000,000   75,000,000 185,000,000 
          repayments of unsecured line of credit
        -530,000,000 -275,000,000 -60,000,000         -440,000,000 -370,000,000 -240,000,000 -80,000,000 -325,000,000    -250,000,000 -15,000,000 -330,000,000 -50,000,000 -335,000,000 -65,000,000 -200,000,000 -190,000,000 -65,000,000 -40,000,000 -360,000,000 -70,000,000                              -419,000,000 -443,000,000   -75,000,000 -185,000,000 
          borrowings on unsecured term loans
        700,000,000                                                                        
          repayment of unsecured term loans
        -700,000,000                                                                       
          payments on finance lease obligations
        -3,488,000 -3,439,000 -3,391,000 -3,344,000 -3,297,000 -3,251,000 -2,839,000 -3,160,000         632,000       126,000 -158,000 -470,000                                                
          borrowings on commercial paper program
        2,974,133,000 1,684,527,000 2,709,842,000 1,287,523,000 1,808,401,000 1,695,857,000                                                                      
          repayments on commercial paper program
        -2,974,133,000 -1,684,527,000 -2,459,842,000 -1,287,523,000 -1,808,401,000 -1,695,857,000                                                                      
          deferred financing costs
        -2,496,000 -22,667,000 -376,000 -14,102,000 -1,343,000 -8,259,000 -2,525,000 -108,000 -6,777,000 -300,000 -6,126,000 -6,213,000 -6,230,000 -1,871,000 -359,000 13,000 -7,128,000 -6,497,000 -7,145,000 -951,000 -9,454,000 -11,000 -83,000 -6,018,000 -6,926,000 -186,000 -8,099,000 -247,000 -16,000 -6,622,000 -448,000   -8,054,000 -8,047,000 -222,000 -1,125,000 -143,000 -20,000 -13,000 -18,000 -15,000 -6,634,000   -20,000 -690,000 -7,667,000 -91,000 -6,867,000 -2,883,000 -5,544,000 -676,000 -8,790,000 -1,912,000   -6,032,000 -684,000 -3,008,000 -125,000 -1,217,000 -9,354,000 -4,732,000 -46,000 -596,000 -119,000 -546,000 -4,717,000 
          capped call transactions premium
                                                                                  
          net activity from equity transactions
        -2,000 505,000 -117,000 -821,000 -3,000 408,000 -2,136,000 406,000 -625,000 586,000 7,000 7,000                                                              
          dividends and distributions
        -123,387,000 -173,302,000 -173,300,000 -173,118,000 -172,509,000 -172,787,000 -172,780,000 -171,794,000 -172,835,000 -171,649,000 -172,055,000 -171,270,000 -171,533,000 -171,535,000 -171,463,000 -170,488,000 -170,372,000 -170,264,000 -171,551,000 -171,566,000 -172,332,000 -172,333,000 -172,275,000 -171,964,000 -166,667,000 -166,666,000 -166,599,000 -166,362,000 -166,364,000 -140,510,000 -140,466,000 -140,288,000 -131,678,000 -131,679,000 -131,666,000 -131,555,000 -114,361,000 -114,334,000 -328,567,000 -114,180,000 -114,179,000 -114,156,000 -883,684,000 -113,950,000 -113,702,000 -116,282,000 -496,330,000 -113,678,000 -113,989,000 -112,511,000 -110,940,000 -93,905,000 -93,725,000 -92,957,000 -92,312,000 -83,996,000 -83,771,000 -83,388,000 -81,442,000 -81,433,000 -81,208,000 -81,094,000 -80,951,000 -80,896,000 -80,740,000 -98,040,000 -97,652,000 -96,943,000 -96,940,000 -105,494,000 -936,390,000 -96,339,000 -96,262,000 -105,369,000 -845,500,000 
          proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships
        17,089,000 1,588,000 60,441,000 5,150,000 70,397,000 95,724,000 67,481,000 141,118,000                                                                    
          distributions to noncontrolling interests in property partnerships
        -19,577,000 -25,550,000 -18,477,000 -19,525,000 -25,351,000 -14,894,000 -17,434,000 -20,025,000 -21,605,000 -12,150,000 -14,614,000 -21,606,000 -24,289,000 -20,150,000 -14,439,000 -26,640,000 -194,160,000 -27,675,000 -19,704,000 -18,225,000 -18,720,000 -11,026,000 -13,315,000 -15,750,000 -16,764,000 -13,748,000 -15,273,000 -24,128,000 -25,705,000 -12,763,000 -13,343,000 -30,690,000 -12,737,000 -14,490,000 -13,314,000 -13,801,000 -12,780,000 -12,999,000 -12,915,000 -25,581,000 -110,446,000 -18,948,000 -17,974,000 -11,594,000 -11,075,000 -9,306,000 -5,143,000             -1,865,000 -500,000 -500,000 -500,000  -500,000 -1,250,000 -1,750,000         
          acquisition of noncontrolling interests in property partnerships
                                                                                  
          net cash from financing activities
        -132,917,000 512,488,000 -1,250,000 -756,882,000 -133,425,000 745,170,000 -129,312,000 -756,909,000 613,134,000 -678,577,000 554,307,000 279,052,000 207,512,000 -16,678,000 452,193,000 -86,970,000 -885,543,000 653,015,000 -398,978,000 -679,936,000 -194,569,000 -187,128,000 800,731,000 65,288,000 -195,627,000 -203,833,000 476,693,000 -190,612,000 -85,402,000 21,209,000 238,876,000 -92,230,000 -97,634,000 -136,857,000 340,625,000 -37,912,000 -241,563,000 -344,570,000 642,337,000 -174,795,000 -341,182,000 -139,715,000 -902,854,000 867,407,000 -208,911,000 -128,282,000 -1,162,701,000 575,552,000 -181,896,000 621,257,000 62,960,000 -102,580,000 -367,690,000 965,286,000 -641,163,000 656,409,000 -30,022,000 -55,461,000 257,102,000 -448,597,000 -65,584,000 465,266,000 -135,689,000    -114,943,000 90,523,000 412,620,000 -108,334,000 -905,452,000 -86,754,000 -308,465,000 -249,853,000 219,896,000 
          net increase in cash and cash equivalents and cash held in escrows
            -136,288,000 733,983,000 -29,133,000 -845,933,000 682,179,000 -698,102,000 664,208,000 227,470,000 287,926,000 -53,964,000   -580,763,000 444,641,000 -311,903,000 -770,146,000 -45,460,000 -226,866,000 1,133,077,000 166,692,000 -112,879,000 -358,159,000   215,407,000 -303,276,000                                              
          cash and cash equivalents and cash held in escrows, beginning of period
        1,335,196,000 1,612,567,000 736,812,000 501,158,000 1,719,329,000 691,886,000 639,191,000 505,369,000                                            
          cash and cash equivalents and cash held in escrows, end of period
        618,537,000 410,888,000 48,634,000 479,207,000 -136,288,000 733,983,000 -29,133,000 766,634,000 682,179,000 -698,102,000 664,208,000 964,282,000 287,926,000 -53,964,000 20,507,000 482,343,000 -580,763,000 444,641,000 -311,903,000 949,183,000 -45,460,000 -226,866,000 1,133,077,000 858,578,000 -112,879,000 -358,159,000 730,626,000 432,298,000 215,407,000 -303,276,000 271,931,000 455,129,000                                            
          reconciliation of cash and cash equivalents and cash held in escrows:
                                                                                   
          cash and cash equivalents, beginning of period
        1,254,882,000 1,531,477,000 690,333,000 452,692,000 1,668,742,000 644,950,000 543,359,000 434,767,000  356,914,000 723,718,000  1,763,079,000  2,365,137,000  1,041,978,000  1,823,208,000  478,948,000  1,448,933,000  241,510,000 1,506,921,000 725,788,000 
          cash held in escrows, beginning of period
        80,314,000 81,090,000 46,479,000 48,466,000 50,587,000 46,936,000 95,832,000 70,602,000                                            
          cash and cash equivalents, end of period
        617,140,000 414,113,000 48,827,000 398,126,000 -165,593,000 735,099,000 -16,319,000 701,695,000 648,830,000 -698,928,000 662,623,000 918,952,000 314,559,000 -80,717,000 20,220,000 436,271,000 -550,036,000 445,421,000 -140,062,000 697,369,000 -46,041,000 23,736,000 1,030,314,000 660,733,000 -106,260,000 -335,791,000 726,910,000 360,091,000 220,857,000 -150,053,000 177,984,000 294,571,000  620,000 189,496,000 302,939,000 -760,721,000 -425,634,000 1,605,678,000  44,256,000 278,355,000 1,064,396,000  -189,912,000 -142,997,000 1,179,573,000  32,544,000 699,355,000 909,376,000  -448,782,000 1,080,801,000 591,196,000  282,440,000 33,279,000 747,305,000  -433,374,000 483,056,000 1,220,392,000  -37,139,000 675,456,000 143,789,000 185,913,000 -56,513,000 -682,533,000 794,643,000 -387,277,000 8,880,000 -131,018,000 2,016,336,000 
          cash held in escrows, end of period
        1,397,000 -3,225,000 -193,000 81,081,000 29,305,000 -1,116,000 -12,814,000 64,939,000 33,349,000 826,000 1,585,000 45,330,000 -26,633,000 26,753,000 287,000 46,072,000 -30,727,000 -780,000 -171,841,000 251,814,000 581,000 -250,602,000 102,763,000 197,845,000 -6,619,000 -22,368,000 3,716,000 72,207,000 -5,450,000 -153,223,000 93,947,000 160,558,000                                            
          supplemental disclosures:
                                                                                   
          cash paid for interest
        163,269,000 170,951,000 167,236,000 175,700,000 170,321,000 163,337,000 161,692,000 180,717,000 149,973,000 130,802,000 147,516,000 125,698,000 110,836,000 122,658,000 104,505,000 111,904,000 107,427,000 131,648,000 79,586,000 146,781,000 97,901,000 121,837,000 99,058,000 114,696,000 101,026,000 121,279,000 109,660,000 107,094,000 112,816,000 110,305,000 103,486,000 89,412,000 121,297,000 89,144,000 295,271,000 92,774,000 110,032,000 123,497,000 93,524,000 134,459,000 106,425,000 136,434,000 104,508,000 156,567,000 110,183,000 158,976,000 220,790,000 179,321,000 97,475,000 196,685,000 74,492,000 136,653,000 67,719,000 135,986,000 140,508,000 128,049,000 67,270,000 119,638,000 71,213,000 119,473,000 88,632,000 89,983,000 96,084,000 58,942,000 92,843,000 61,037,000 94,237,000 60,369,000 83,939,000 63,236,000 82,096,000 68,552,000 88,479,000 69,007,000 74,452,000 
          interest capitalized
        14,670,000 13,491,000 12,148,000 10,317,000 10,634,000 11,625,000 10,336,000 9,381,000 9,207,000 12,273,000 10,564,000 10,589,000 12,082,000 12,229,000 14,079,000 13,740,000 16,465,000 11,586,000 13,014,000 12,032,000 12,552,000 13,463,000 13,717,000 14,149,000 13,658,000 16,184,000 13,256,000 11,813,000 14,172,000 16,595,000 17,621,000 17,378,000 17,784,000 16,658,000 14,283,000 12,345,000 9,788,000 9,899,000 9,269,000 8,298,000 9,100,000 8,850,000 7,965,000 7,667,000 12,223,000 14,877,000 17,709,000 17,900,000 17,398,000 18,436,000 14,418,000 12,869,000 10,131,000 10,077,000 11,201,000 11,977,000 13,004,000 11,958,000 11,239,000 14,569,000 9,302,000 9,023,000 8,087,000 11,637,000 12,982,000 12,087,000 12,110,000 11,397,000 11,265,000 9,736,000 9,485,000 10,419,000 8,375,000 7,944,000 4,308,000 
          non-cash investing and financing activities:
                                                                                   
          write-off of fully depreciated real estate
        -46,573,000 -60,830,000 -27,488,000 -20,549,000 -35,421,000 -18,654,000 -30,006,000 -27,993,000  -25,276,000 -29,487,000 -56,391,000 -23,538,000 -30,561,000 -30,489,000 -34,946,000 -80,209,000 -60,436,000 -73,511,000 -25,161,000 -25,910,000 -23,443,000 -11,359,000 -38,782,000  -25,213,000 -29,643,000 -31,640,000 -35,313,000 -21,218,000 -49,291,000 -29,609,000 -20,919,000 -17,837,000 -36,843,000 -49,292,000 -116,153,000                                       
          change in real estate included in accounts payable and accrued expenses
        -28,511,000 -23,714,000 48,937,000 15,198,000 -29,856,000 27,861,000 -378,000 -48,518,000  3,873,000 13,870,000 11,692,000 68,296,000 -11,365,000 23,748,000 16,907,000 -3,079,000 718,000 19,956,000 -42,778,000 11,076,000 -5,463,000 1,954,000 -27,415,000                                                    
          right of use assets obtained in exchange for lease liabilities - operating lease
            4,994,000 25,637,000                                                                    
          right of use assets obtained in exchange for lease liabilities - finance lease
                                                                                   
          proceeds from sale of real estate
                                                                                  
          net decrease in cash and cash equivalents and cash held in escrows
         410,888,000 48,634,000 -855,989,000            -18,815,000            -206,893,000    -50,240,000                                            
          lease liability - finance lease reversal for re-assessment event
                                                                                  
          right of use asset - finance lease reversal for re-assessment event
                                                                                  
          impairment loss
            13,615,000                  24,038,000                    8,306,000                         
          gain on sale of real estate
                                                                                   
          non-cash contributions from noncontrolling interests in property partnerships
          -2,674,000 281,000                                                                        
          capitalized operating lease costs
          7,548,000 7,548,000  7,549,000 7,550,000 7,548,000                                                                    
          investment in unconsolidated joint ventures eliminated upon consolidation
             -11,834,000                                                                    
          mortgage note payable recorded upon consolidation
             207,093,000                                                                    
          losses from investments in securities
           365,000     -3,245,000       2,262,000                                                   587,000         
          building and other capital improvements
           -57,395,000 -71,256,000 -51,612,000 -34,712,000 -32,087,000 -54,031,000 -39,049,000 -39,244,000 -39,100,000 -64,249,000 -49,477,000 -36,467,000 -26,811,000 -47,158,000 -37,807,000 -33,316,000 -32,717,000 -43,232,000 -48,508,000 -29,232,000 -39,154,000 -51,216,000 -49,397,000 -47,224,000 -32,719,000 -48,802,000 -44,239,000 -43,180,000 -53,550,000 -60,087,000 -61,587,000 -57,121,000 -43,687,000 -33,536,000 -22,977,000 -25,329,000 -28,111,000 -36,511,000 -28,742,000 -19,391,000 -25,150,000 -20,044,000 -19,775,000 -17,510,000 -27,016,000 -23,124,000 -9,519,000 -14,162,000 -17,784,000 -10,590,000 -12,956,000 -8,613,000 -32,555,000 -16,016,000 -4,516,000 -8,874,000                 
          real estate and intangibles recorded upon consolidation
              -220,015,000                                                                    
          dividends and distributions declared but not paid
           172,674,000   18,000 172,154,000  451,000 38,000 171,427,000  15,000 68,000 170,869,000  21,000 -1,285,000 171,003,000   51,000 171,026,000  2,000 67,000 165,352,000 -4,000 25,855,000 45,000 139,218,000 8,606,000 2,000 14,000 130,418,000 -33,000 -8,000 113,079,000 214,408,000 20,000 96,000 112,796,000 769,764,000 288,000 -2,379,000 114,799,000 384,772,000 45,000 1,539,000 110,886,000 17,027,000 108,000 738,000 92,615,000 8,317,000 215,000 350,000 83,019,000 -37,000 203,000 109,000 80,756,000 73,000 -12,000 -17,072,000 97,547,000 671,000 40,000 -8,699,000 105,150,000 848,718,000 -40,000 -9,092,000 105,284,000 
          conversions of noncontrolling interests to stockholders’ equity
           3,676,000   1,451,000 1,303,000  2,920,000 599,000 195,000  959,000 401,000 5,028,000  1,748,000 2,087,000 4,198,000   10,849,000 15,495,000  223,000 720,000 492,000 768,000 916,000 364,000 832,000 104,000 390,000 15,629,000 793,000 3,217,000 2,218,000 446,000 186,000 3,314,000 2,154,000 8,689,000 332,000 127,000 1,614,000 627,000 19,885,000 97,000 10,037,000 272,000 23,385,000 4,405,000 805,000 6,026,000 14,317,000 23,630,000 18,335,000 29,216,000 3,434,000 9,767,000 3,003,000 978,000             
          issuance of restricted securities to employees and non-employee directors
           42,281,000   1,377,000 41,989,000  236,000 1,369,000 46,516,000  1,407,000 1,116,000 46,082,000  1,742,000 1,260,000 41,255,000                                                        
          other income - assignment fee
                                                                                 
          gain on sales-type lease
                                                                                   
          notes receivable
                    -144,000 -8,000 -126,000 -142,000 -137,000 -140,000 376,000 -137,000                                                      
          proceeds from assignment fee
                                                                                 
          proceeds from notes receivable
                                                                                 
          amortization of above and below market leases
             -1,298,000                                                                      
          unrealized gain on non-real estate investment
             -94,000    51,000 -124,000 -259,000                                                                
          acquisition of real estate
             6,086,000                   -43,061,000                                               
          construction in progress from prepaid expenses and other assets
                                                                                   
          borrowings on unsecured term loan
                1,200,000,000                                                              
          repayment of unsecured term loan
                -730,000,000     -500,000,000                                                        
          non-cash distributions to noncontrolling interests in property partnerships
                                                                                   
          unrealized loss on non-real estate investment
               -396,000                                                                    
          boston properties, inc.consolidated statements of cash flows
                                                                                   
          non-cash distributions to noncontrolling interests in property
               52,786,000                                                                    
          settlement of accreted debt discount on redemption of unsecured senior notes
                        -2,210,000 -6,290,000                                                       
          losses from early extinguishments of debt
                        44,284,000 898,000                                        3,990,000 6,051,000 2,170,000 16,000       116,000 722,000 
          proceeds from sale of investment in unconsolidated joint venture
                        200,000 17,589,000                                                        
          redemption of preferred stock
                                                                                 
          debt issuance costs
                                                                                   
          debt prepayment and extinguishment costs
                        -42,851,000 -185,000     -1,446,000                                                   
          issuance of related party note receivable
                                                                                 
          contributions from noncontrolling interests in property partnerships
                 5,116,000 7,555,000 849,000 4,264,000 11,318,000 2,139,000 281,000 855,000 1,407,000 2,081,000 3,876,000 8,848,000 14,820,000 7,761,000 4,387,000 9,553,000 9,616,000 12,265,000 15,267,000 13,813,000 14,700,000 15,351,000 8,145,000 1,697,000 2,551,000 2,489,000  669,000 460,000 629,000  1,305,000 1,207,000 468,000                             
          right of use assets obtained in exchange for lease liabilities
                                                                                   
          construction in progress, net deconsolidated
                                                                                 
          investment in unconsolidated joint ventures recorded upon deconsolidation
                                                                                  
          loss (income) from unconsolidated joint ventures
                  6,668,000 7,569,000        -5,225,000 79,700,000   369,000                                                    
          losses (gains) from investments in securities
                  -1,571,000 -1,665,000 -2,096,000 1,571,000         -4,552,000 5,445,000        126,000        -493,000            -187,000     860,000     678,000 -200,000  -1,317,000           
          income from unconsolidated joint ventures
                    58,451,000 3,524,000 54,000 -2,189,000           -47,964,000 -213,000   -769,000 -461,000 -4,197,000 -843,000 -3,108,000 -3,084,000 -1,464,000 -2,234,000 -1,791,000 -2,211,000 -2,647,000 -3,078,000 -14,834,000 -2,700,000 -4,419,000 -2,834,000 -2,816,000 -2,834,000 -14,736,000 -48,783,000 -8,721,000 -6,949,000 -9,217,000 -21,191,000 -11,721,000 -57,712,000 -11,326,000 -8,882,000 -7,976,000  -11,565,000 -7,465,000 -7,910,000  -6,350,000 351,000 -5,097,000         
          lease liabilities - finance leases
                                                                                   
          investments in non-real estate investments
                                                                                   
          issuance of notes receivable
                                                        184,000 -285,000 210,000 -1,239,000 -735,000                     
          redemption of unsecured senior notes
                        -997,790,000 -843,710,000                                                       
          right-of-use assets obtained in exchange for lease liabilities
                                                                                 
          net proceeds from equity transactions
                       -332,000 4,186,000 448,000 -63,000 19,643,000 1,000 93,000 -166,000 3,349,000 11,148,000 301,000 469,000 1,792,000 -397,000 351,000 39,000 -723,000 422,000 2,000 -183,000 396,000 -9,000 -657,000 467,000 477,000 -145,000 393,000 368,000 1,689,000 -527,000 14,000 346,000 -135,000 -559,000 10,000 -757,000 360,000 613,000  747,000 5,679,000 3,128,000  15,879,000 5,205,000 849,000  3,226,000 843,080,000 521,000  495,000 302,000 -1,528,000  995,000 645,000 12,881,000 
          preferred stock redemption liability
                           200,000,000                                                        
          deferred distributions from sale of investment in unconsolidated joint ventures
                                                                                   
          deferred proceeds from sale of investment in unconsolidated joint ventures
                                                                                   
          right of use assets - finance leases
                                                                                  
          cash and cash equivalents deconsolidated
                                                                                  
          acquisition of noncontrolling interests in property partnership
                                                                                   
          prepaid rent reclassified to right of use asset
                                                                                   
          accrued rental income, net deconsolidated
                             -4,558,000                                                    
          tenant leasing costs, net deconsolidated
                             -3,462,000                                                    
          building and other capital improvements, net deconsolidated
                             -111,889,000                                                    
          tenant improvements, net deconsolidated
                             -12,331,000                                                    
          investment in unconsolidated joint venture recorded upon deconsolidation
                             347,898,000                                                    
          (gains) losses from investments in securities
                           -1,659,000        -2,969,000                                                
          deferred distributions from sale of investment in unconsolidated joint venture
                           5,808,000                                                        
          deferred proceeds from sale of investment in unconsolidated joint venture
                           200,000                                                        
          deposit on capital lease
                                                                                   
          proceeds from unsecured term loan
                                                                                 
          payments on capital lease obligations
                                       -3,000 -28,000 113,000                                          
          payments on real estate financing transactions
                                    -516,000 -444,000 -1,534,000 -293,000 -533,000 -480,000 -422,000 -3,509,000 -781,000                             -1,574,000 -1,569,000 -1,542,000 -1,523,000 -2,454,000 -2,432,000 -2,809,000 -2,915,000 
          real estate acquired through capital lease
                                                                                 
          income from early extinguishment of debt
                                                                                   
          right of use asset - finance lease deconsolidated
                                                                                   
          lease liability - finance lease deconsolidated
                                                                                   
          real estate acquired through finance lease
                                  122,563,000                                                
          (gains) losses on sales of real estate
                               -410,165,000                                                    
          note receivable
                               -128,000 380,000 -126,000 -125,000 -125,000                                                
          cash and cash equivalents and cash held in escrows, beginning of year
                               691,886,000                                                    
          cash and cash equivalents and cash held in escrows, end of year
                               858,578,000                                                    
          issuance of restricted securities to employees
                               43,104,000  1,495,000 37,428,000  909,000 36,433,000  -234,000 1,353,000 34,592,000 1,081,000 32,630,000  1,084,000 42,279,000  911,000 26,534,000                             
          amortization of right-of-use assets - operating leases
                                                                                   
          losses (gains) from early extinguishments of debt
                                                                                   
          issuance of note receivable
                                                                                
          proceeds from note receivable
                                                                           100,000,000 23,000,000     
          repayments of mezzanine notes payable
                                                                                 
          repayments of outside members’ notes payable
                                                                                 
          deposit on mortgage note payable interest rate lock
                                                                                 
          return of deposit on mortgage note payable interest rate lock
                                                                                 
          acquisition of noncontrolling interest in property partnership
                                -11,000                                                  
          additions to real estate included in accounts payable and accrued expenses
                                 -19,293,000 65,461,000 49,689,000  -12,072,000 -34,919,000 35,245,000  13,615,000 -21,714,000 44,708,000 26,335,000 10,386,000 -24,857,000  10,642,000 8,361,000 9,243,000  15,185,000 -4,562,000 9,393,000 13,427,000 1,651,000 -2,729,000 7,475,000 2,869,000                        
          building and other capital improvements deconsolidated
                                                                                   
          investment in unconsolidated joint venture recorded on deconsolidation
                                                                                   
          losses (gains) on sales of real estate
                                   905,000                                                
          gain on sale of investment in unconsolidated joint venture
                                                                                   
          outside members’ notes payable contributed to noncontrolling interests in property partnerships
                                                                                 
          issuance of restricted securities to employees and directors
                                                       4,176,000 25,901,000 -153,000 396,000 -184,000 26,139,000 704,000 24,383,000 454,000 18,768,000 1,345,000 21,619,000 253,000 422,000 42,861,000 17,658,000 
          gains from early extinguishments of debt
                                                            -282,000 -914,000                     
          (gains) losses from early extinguishments of debt
                                        1,164,000                                           
          cash held in escrows
                                        399,000 264,000 867,000 6,664,000 1,043,000 -1,308,000 1,940,000 14,466,000 -32,575,000 -1,219,000 1,044,000 -524,000 6,004,000 -5,008,000 2,961,000 -3,702,000 1,330,000 2,984,000 -297,000 2,469,000 -872,000 -684,000 9,359,000 -3,573,000 -1,820,000 3,253,000 -7,661,000 -7,260,000 2,111,000 -4,534,000 1,019,000 -1,186,000 1,608,000 -2,869,000 2,550,000 402,000 2,272,000 -2,004,000 2,878,000 -7,683,000 4,830,000 -2,331,000 2,620,000 
          proceeds from sales of real estate placed in escrow
                                        -13,170,000   -17,951,000 -104,696,000  1,245,000 -201,857,000                                 
          proceeds from sales of real estate released from escrow
                                        13,170,000 796,000   17,951,000 104,696,000  192,262,000 341,987,000 99,916,000                                 
          cash placed in escrow for land sale contracts
                                                                                 
          cash released from escrow for land sale contracts
                                            622,000 293,000 488,000 2,062,000 2,492,000                                   
          cash released from escrow for investing activities
                                        -408,000 634,000 3,774,000 5,230,000                                       
          cash placed in escrow for investment in unconsolidated joint venture
                                                                                  
          investments in marketable securities
                                                                                   
          proceeds from real estate financing transaction
                                               6,000,000                              1,610,000 
          redemption of preferred units
                                                 -1,389,000                              
          net increase in cash and cash equivalents
                                        -58,288,000 620,000 189,496,000 -53,975,000  -425,634,000 881,960,000     916,415,000 -189,912,000   723,862,000 32,544,000   -181,237,000 -448,782,000 1,080,801,000 -1,232,012,000 760,184,000 282,440,000 33,279,000 268,357,000 -791,126,000 -433,374,000   666,827,000 -37,139,000   185,913,000 -56,513,000 -682,533,000 -712,278,000 -387,277,000 8,880,000 -131,018,000 1,290,548,000 
          cash and cash equivalents, beginning of year
                                                                                   
          cash and cash equivalents, end of year
                                                                                   
          marketable securities transferred in connection with the legal defeasance of mortgage note payable
                                                                                   
          mortgage note payable legally defeased
                                                                                   
          mortgage note payable assigned in connection with the sale of real estate
                                                                                   
          deposit on real estate
                                                 -5,000,000                                 
          acquisition of noncontrolling interest
                                                                                   
          net decrease in cash and cash equivalents
                                                44,256,000 278,355,000 -698,683,000    -1,185,564,000    -132,602,000            -228,541,000    -97,721,000         
          mortgage notes payable assigned in connection with the sale of real estate
                                                                                   
          deposits on real estate
                                                                                  
          gains on consolidation of joint ventures
                                                       1,810,000                           
          settlement of accreted debt discount on repurchases/repayments of unsecured senior notes and unsecured exchangeable senior notes
                                                                                   
          gains on sales of real estate from discontinued operations
                                                       -26,381,000                            
          gain on forgiveness of debt from discontinued operations
                                                       -20,182,000  -17,807,000                     
          impairment income from discontinued operations
                                                       3,241,000                         
          proceeds from sales of real estate and sales of interests in property partnerships placed in escrow
                                                                                   
          proceeds from sales of real estate and sales of interests in property partnerships released from escrow
                                                                                   
          cash recorded upon consolidation
                                                                                 
          redemption/repurchase of unsecured senior notes
                                                                                   
          redemption/repurchase of unsecured exchangeable senior notes
                                                           -507,434,000                     
          payments on capital lease obligation
                                                                                   
          net proceeds from preferred stock issuance
                                                       -297,000 -451,000 194,371,000                         
          sales of interests in property partnerships and contributions from noncontrolling interests in property partnerships
                                                                                   
          real estate and related intangibles recorded upon consolidation
                                                                                 
          debt recorded upon consolidation
                                                                                 
          working capital recorded upon consolidation
                                                       79,468,000 6,567,000                           
          noncontrolling interests recorded upon consolidation
                                                       -2,627,000                           
          investment in unconsolidated joint venture eliminated upon consolidation
                                                                                  
          mortgage note payable extinguished through foreclosure
                                                        25,000,000  25,000,000                     
          real estate transferred upon foreclosure
                                                       7,508,000  8,198,000                     
          land improvements contributed by noncontrolling interest in property partnership
                                                       4,546,000                         
          issuance of common stock in connection with the exchange of exchangeable senior notes
                                                                                 
          conversion of redeemable preferred units to common units
                                                           1,737,000 4,115,000                     
          settlement of accreted debt discount on repurchases of unsecured exchangeable senior notes
                                                    -92,979,000    -68,760,000     -4,325,000               
          repayment of unsecured exchangeable senior notes
                                                      -654,521,000                             
          payments on real estate financing transaction
                                                -841,000 -887,000 -636,000                                 
          conversions of redeemable preferred units to common units
                                                                                  
          net proceeds from atm stock issuances
                                                           -159,000 137,856,000 109,330,000 44,320,000 49,348,000 345,369,000                 
          mortgage note payable assumed in connection with the acquisition of real estate
                                                                143,900,000                 
          redeemable noncontrolling interest in property partnership
                                                                                   
          preferred units issued in connection with the acquisition of real estate
                                                                                  
          gain on sale of real estate from discontinued operations
                                                                                 
          proceeds from the sales of real estate
                                                        121,495,000                           
          repayments of notes receivable
                                                                                  
          repayment/redemption of unsecured exchangeable senior notes
                                                                                  
          proceeds from the sale of real estate
                                                                                 
          proceeds from land transaction
                                                                                 
          proceeds from mortgage loan released from (placed in) escrow
                                                                                  
          redemption/repurchase/exchange of unsecured exchangeable senior notes
                                                                                 
          deposit on mortgage loan financing
                                                                                   
          returned deposit on mortgage loan financing
                                                                                   
          sale of interest in property partnership and contributions from noncontrolling interests in property partnerships
                                                                                   
          mortgage note extinguished through foreclosure
                                                                                   
          contributions from noncontrolling interest in property partnership
                                                        368,000 143,000 5,875,000                         
          distributions to noncontrolling interest in property partnerships
                                                        -1,735,000 -2,350,000 -2,100,000                         
          settlement of accreted debt discount on repurchases of senior notes
                                                                                   
          suspension of development
                                                                                   
          acquisition of note receivable
                                                                                  
          repurchase of equity component of unsecured exchangeable senior notes
                                                                                   
          acquisition of noncontrolling interest in property partnerships
                                                                                   
          note receivable converted to real estate
                                                                                  
          proceeds from mortgage loan released from escrow
                                                                                   
          distributions to noncontrolling interest in property partnership
                                                            -750,000 -750,000 -750,000  -500,000 -500,000 -500,000                 
          deposit on real estate released from escrow
                                                                  10,000,000                 
          additions to real estate included in accounts payable
                                                             -2,434,000 5,659,000 -4,394,000 -3,993,000 11,060,000 8,094,000 -3,234,000 6,275,000 548,000 104,000 -4,658,000 217,000 21,894,000 19,336,000 5,104,000 -441,000 11,108,000 2,304,000 -9,095,000 4,245,000 4,621,000 4,056,000 
          losses (gains) on investments in securities
                                                                                   
          non-cash rental revenue
                                                                                 
          construction in process
                                                                                   
          deposit on real estate released from (placed in) escrow
                                                                                  
          repurchases of unsecured senior notes
                                                                                   
          repurchases of unsecured exchangeable senior notes
                                                                   -46,298,000 -122,974,000 -49,320,000             
          repayment of note payable
                                                                       -25,000,000         
          proceeds from equity transactions
                                                                                   
          cash and cash equivalents, beginning of the year
                                                                                   
          cash and cash equivalents, end of the year
                                                                                   
          mortgage notes payable assumed in connection with the acquisition of real estate
                                                                               65,224,000 
          gain from suspension of development
                                                                     -7,200,000             
          deposits on real estate released from escrow
                                                                                   
          net derivative losses
                                                                           7,172,000 6,318,000 -257,000 3,788,000     
          (income) income from unconsolidated joint ventures
                                                                                   
          acquisitions/additions to real estate
                                                                       -118,641,000 -127,700,000 -105,135,000 -91,368,000 -110,409,000 -234,945,000 -139,111,000 -91,509,000 -418,493,000 -92,015,000 -116,265,000 -505,821,000 
          proceeds from redemptions of investments in securities
                                                                   -139,000 -154,000 -112,000 2,554,000 1,000,000 2,054,000 -571,000 1,595,000 1,768,000 3,272,000 3,016,000 6,641,000     
          mortgage loan proceeds placed in escrow
                                                                                   
          net proceeds from the sale/financing of real estate released from escrow
                                                                           11,939,000        
          net proceeds from the sales of real estate
                                                                            -528,000 30,184,000 98,074,000  278,675,000 33,436,000 1,461,014,000 
          advance from joint venture partners
                                                                                 
          repayment of advance from joint venture partners
                                                                                  
          equity component of unsecured exchangeable senior notes
                                                                                   
          capped call transaction costs
                                                                                  
          mortgage notes payable assumed in connection with acquisitions of real estate
                                                                                   
          issuance of op units in connection with the acquisition of real estate
                                                                                 
          issuance of op units in connection with an investment in an unconsolidated joint venture
                                                                                 
          basis adjustment in connection with conversions of noncontrolling interests to stockholders’ equity
                                                                                   
          note receivable issued in connection with the transfer of real estate
                                                                           123,000,000     
          loss from suspension of development
                                                                                   
          additions to real estate
                                                                    -191,825,000 -132,486,000 -119,407,000             
          proceeds from mortgage loan placed in escrow
                                                                                   
          repayment of unsecured line of credit
                                                                                   
          net investments in unconsolidated joint ventures
                                                                      -36,093,000 -675,000 -3,674,000 -345,000 -3,141,000 -5,434,000 -373,590,000 -444,836,000 -72,167,000 -2,475,000 -10,582,000 14,984,000 -9,717,000 
          income from suspension of development
                                                                       27,766,000         
          gains on sales of real estate and other assets
                                                                                   
          net proceeds from the sale/financing of real estate placed in escrow
                                                                                   
          net proceeds from the sales of real estate and other assets
                                                                                   
          proceeds from real estate financing transactions
                                                                                   
          contributions from (distributions to) noncontrolling interest holders
                                                                                   
          redemption of noncontrolling interest
                                                                                   
          real estate recorded upon consolidation
                                                                                   
          mortgage notes payable recorded upon consolidation
                                                                                   
          noncontrolling interest recorded upon consolidation
                                                                                   
          net provided by (cash used) in financing activities
                                                                                   
          basis adjustment to real estate in connection with conversions of noncontrolling interests to stockholders’ equity
                                                                                   
          net cash from in financing activities
                                                                                   
          net income available to common shareholders
                                                                           -91,234,000 48,479,000 79,526,000 88,461,000 124,218,000 242,542,000 103,623,000 854,307,000 
          adjustments to reconcile net income available to common shareholders to net cash from operating activities:
                                                                                   
          losses on investments in securities
                                                                           2,802,000 940,000 16,000 846,000     
          minority interests in property partnerships
                                                                           427,000 525,000 420,000 625,000     
          minority interest in operating partnership
                                                                           -14,213,000 9,703,000 14,917,000 16,437,000 31,370,000 43,712,000 17,906,000 152,712,000 
          contributions from (distributions to) minority interest holders
                                                                           -6,827,000 -11,880,000 -1,744,000 -458,000     
          redemption of minority interest
                                                                               -25,000,000 -10,625,000 
          minority interest recorded upon consolidation
                                                                                   
          conversions of minority interests to stockholders' equity
                                                                                   
          basis adjustment in connection with conversions of minority interests to
                                                                                   
          stockholders’ equity
                                                                                   
          financing incurred in connection with the acquisition of real estate
                                                                                   
          earnings in excess of distributions from unconsolidated joint ventures
                                                                                   
          conversions of minority interests to stockholders’ equity
                                                                            2,429,000 1,445,000 3,298,000  6,799,000 101,000 23,202,000 
          basis adjustment to real estate in connection with conversions of minority interests to stockholders’ equity
                                                                            5,858,000 3,881,000 7,832,000  15,196,000 261,000 96,408,000 
          distributions (earnings) in excess of earnings (distributions) from unconsolidated joint ventures
                                                                                  1,473,000 
          net proceeds from the sale of real estate released from escrow
                                                                             126,321,000     
          distributions in excess of earnings from unconsolidated joint ventures
                                                                              897,000     
          minority interest in property partnerships
                                                                                   
          income from investment in unconsolidated joint venture
                                                                                   
          cumulative effect of a change in accounting principle
                                                                                   
          proceeds from sale of securities
                                                                                   
          redemption of op units
                                                                                   
          contributions from minority interest holders
                                                                               1,007,000 849,000 725,000 1,723,000 
          distributions to minority interest holders
                                                                                   
          basis adjustment in connection with conversions of minority interests to stockholders' equity
                                                                                   
          minority interest in property partnership
                                                                                   
          net proceeds from the sale of real estate placed in escrow
                                                                                   
          proceeds from sale of marketable securities
                                                                                   
          proceeds from a real estate financing transactions
                                                                                   
          net proceeds from the issuance of common securities
                                                                                   
          mortgage notes payable assumed in connection with the acquisitions of real estate
                                                                                   
          basis adjustment in connection with conversions of minority interests to stockholders’ equity