7Baggers

SL Green Realty Corp Quarterly Cash Flow Statements Chart

Quarterly
 | 
Annual
 
 Operating Cash Flow  
 Investing Cash Flow  
 Financing Cash Flow  
20200930 20201231 20210331 20210630 20210930 20211231 20220331 20220630 20220930 20221231 20230331 20230630 20230930 20231231 20240331 20240630 20240930 20241231 20250331 20250630 -24.6811.1847.0382.88118.73154.59190.44226.29Milllion

SL Green Realty Corp Quarterly Cash Flow Statements Table

Quarterly
 | 
Annual
 
Unit: USD2025-06-30 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 2015-09-30 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 2012-06-30 2012-03-31 2011-09-30 2011-06-30 2011-03-31 2009-09-30 2007-12-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 2002-12-31 
                                                                      
  operating activities                                                                    
  net income-6,817,000 -21,545,000 19,138,000 -9,264,000 1,959,000 18,389,000 -160,058,000 -21,694,000 -379,228,000 -38,357,000 -64,050,000 12,211,000 -37,949,000 13,485,000 -48,181,000 415,534,000 117,134,000 -3,855,000 200,340,000 20,677,000 66,627,000 127,114,000 24,255,000 40,722,000 173,741,000 52,769,000 -58,320,000 99,454,000 115,899,000 113,823,000 38,335,000 45,795,000 16,015,000 924,000 43,343,000 149,095,000 32,503,000 176,753,000 -29,179,000 55,636,000 65,325,000 73,595,000 250,331,000 156,612,000 44,362,000 45,336,000 31,248,000 30,337,000 118,457,000 35,157,000 16,489,000 549,184,000 93,894,000 4,593,000 133,627,000 25,805,000 42,297,000 61,438,000 27,879,000 116,494,000 25,150,000 48,831,000 18,955,000 22,198,000 21,641,000 17,973,000 36,347,000 19,167,000 
  adjustments to reconcile net income to net cash from operating activities:                                                                    
  depreciation and amortization61,902,000 66,185,000 55,170,000 54,845,000 53,924,000 50,123,000 51,476,000 52,364,000 71,238,000 80,569,000 74,856,000 50,505,000 48,831,000 48,931,000 49,254,000 51,622,000 60,647,000 66,770,000 60,414,000 95,667,000 98,602,000 70,779,000 67,177,000 73,576,000 72,173,000 71,085,000 74,153,000 73,377,000 71,460,000 72,925,000 88,701,000 95,736,000 136,486,000 98,895,000 117,480,000 432,475,000 187,240,000 153,345,000 205,517,000 114,955,000 104,124,000 101,848,000 100,349,000 93,680,000 92,766,000 91,805,000 87,882,000 85,146,000 81,365,000 80,663,000 76,203,000 68,376,000 67,979,000 60,100,000 60,350,000 17,253,000 17,205,000 15,816,000 14,834,000 15,091,000 10,692,000 13,318,000 13,048,000 12,438,000 12,681,000 11,280,000 10,883,000 10,415,000 
  equity in net income (income) from unconsolidated joint ventures                      11,874,000 9,864,000 7,546,000 5,234,000                        1,560,000                   
  distributions of cumulative earnings from unconsolidated joint ventures158,000 122,000 12,686,000 69,000 169,000 68,000 9,383,000 105,000 151,000 258,000 332,000 105,000 155,000 188,000 105,000 545,000 105,000 69,000 103,000 370,000 98,000 108,000 216,000 82,000 141,000 425,000 103,000 285,000 2,379,000 7,510,000 700,000 7,221,000 6,920,000 5,468,000 4,051,000 6,369,000 8,891,000 10,677,000 6,975,000 15,489,000 5,794,000 8,420,000 6,976,000 7,669,000 13,274,000 8,256,000 6,566,000 6,901,000 73,573,000 4,408,000 1,921,000 4,951,000 2,915,000 10,506,000               
  equity in net gain on sale of interest in unconsolidated joint venture/real estate                                             354,000                       
  purchase price and other fair value adjustments9,617,000 9,611,000 -125,287,000 -12,906,000 -1,265,000 50,492,000 10,273,000 -10,183,000 17,409,000 -239,000 770,000 1,117,000 6,168,000 63,000 -543,000 -208,810,000 1,947,000 -2,664,000     -3,799,000 -67,631,000 2,041,000  3,057,000 -11,149,000 -49,293,000                                       
  depreciable real estate reserves and impairment8,546,000  13,721,000 52,118,000  -389,000        -2,545,000 8,241,000                                                  
  loss on sale of real estate167,000 482,000      -516,000 26,678,000 1,651,000    1,002,000                                                       
  loan loss reserves and other investment reserves, net of recoveries-46,287,000 -25,039,000      6,890,000         8,280,000 8,957,000 6,813,000 11,248,000     5,752,000                                          
  gain on sale of investments in marketable securities                                 -3,262,000                                   
  gain on early extinguishment of debt                                      49,000                             
  deferred rents receivable-1,339,000 3,586,000 631,000 -157,000 1,712,000 -3,721,000 -1,708,000 -1,838,000 -6,926,000 -7,431,000 -4,378,000 -2,446,000 1,621,000 -546,000 262,000 181,000 -4,459,000 -2,685,000 -4,123,000 -6,036,000 -1,140,000 3,717,000 -3,936,000 -4,331,000 -4,560,000 -1,114,000 -6,888,000 -6,959,000 -1,249,000 -3,120,000 -4,486,000 -10,286,000 -11,515,000 -11,722,000 -12,986,000 53,694,000 -652,000 -33,755,000 -32,893,000 -32,367,000 -12,626,000 -17,009,000 -15,594,000 -11,133,000 -12,718,000                        
  non-cash lease expense5,239,000 5,191,000 5,143,000 5,095,000 5,049,000 5,003,000 4,958,000 4,927,000 5,289,000 5,261,000 5,071,000 5,252,000 6,037,000 6,043,000 5,564,000 4,132,000 4,163,000 3,375,000 2,249,000 3,188,000 3,157,000 3,390,000                                               
  other non-cash adjustments13,555,000 9,499,000 14,759,000 7,266,000 13,028,000 11,166,000 21,529,000 9,168,000 748,000 -3,271,000 6,274,000 -1,544,000 -3,442,000 -6,964,000 9,296,000 9,731,000 2,573,000 15,564,000 304,000 7,226,000 6,538,000 1,110,000 9,844,000 -15,004,000 -4,111,000 9,542,000 -5,975,000 -497,000 -2,751,000 12,155,000 -1,227,000 872,000 -3,165,000 20,716,000 8,718,000 -149,356,000 -14,920,000 -12,548,000 -8,182,000 4,590,000 -15,438,000 -1,959,000 1,630,000 -12,792,000 -6,035,000    -1,795,000 5,554,000 -616,000   -1,964,000 -47,000 -383,000 879,000            
  changes in operating assets and liabilities:                                                                    
  tenant and other receivables5,533,000 -6,046,000 889,000 -4,381,000 -5,138,000 -3,174,000 1,127,000 953,000 -2,836,000 -969,000 6,570,000 -6,967,000 1,094,000 13,673,000 -8,734,000 -9,334,000 1,645,000 -4,138,000 25,995,000 14,256,000 -12,365,000 -44,960,000 2,596,000 -6,455,000 3,650,000 -4,759,000 3,782,000 3,583,000 1,450,000 -1,847,000 -3,399,000 -3,765,000 175,000 1,272,000 -2,106,000 -3,009,000 7,829,000 -1,672,000 -13,922,000 7,096,000 9,314,000 -13,226,000 -6,009,000 11,899,000 -4,552,000 -7,914,000 -2,513,000 7,409,000  14,000   1,025,000 4,716,000         73,000      
  related party receivables6,600,000 8,334,000 -11,595,000 -4,778,000 4,714,000 245,000 -678,000 17,359,000 -1,470,000 577,000 863,000 4,345,000 3,793,000 -2,335,000 -4,101,000 -2,571,000 -1,372,000 -683,000 -2,744,000 -200,000 9,106,000 -4,711,000 -1,119,000 4,440,000 5,751,000 -1,270,000 -6,230,000 6,302,000 3,451,000 -4,567,000 1,029,000 -369,000 -4,658,000 -3,211,000 -1,781,000 2,117,000 -4,503,000 306,000 693,000 -353,000 1,527,000 -4,347,000 11,032,000 -11,885,000 -730,000 -955,000     -633,000 -1,292,000 2,449,000    380,000 541,000 508,000 -1,092,000 574,000        
  deferred lease costs-9,381,000 -4,469,000 -17,351,000 -4,251,000 -3,934,000 -3,735,000 -9,361,000 -2,175,000 -1,980,000 -3,911,000 -11,565,000 -3,305,000 -2,682,000 -4,240,000 -8,850,000 2,335,000 -3,362,000 -240,000 -8,428,000 -1,329,000 -2,540,000 -8,603,000 -32,396,000 -6,359,000 -19,072,000 -13,111,000 -12,330,000 -14,359,000 -9,790,000 -7,679,000 -10,460,000 -7,919,000 -14,139,000 -9,421,000 -15,085,000 -18,818,000 -13,133,000 -10,755,000 -24,901,000 -11,017,000 -35,789,000 -6,856,000 -6,212,000 -4,476,000 -23,726,000                        
  other assets13,736,000 -28,978,000 27,300,000 -22,963,000 24,275,000 -12,644,000 11,332,000 -14,489,000 12,395,000 -11,160,000 7,771,000 -32,463,000 22,425,000 -25,076,000 20,463,000 -15,668,000 39,904,000 -24,354,000 29,164,000 -37,938,000 30,767,000 -48,130,000 28,509,000 -46,844,000 39,923,000 -40,218,000 43,862,000 -47,843,000 43,497,000 -47,826,000 35,000,000 -58,748,000 46,036,000 -45,356,000 -35,261,000 51,098,000 -46,736,000 -55,146,000 49,690,000 -38,280,000 45,057,000 -35,279,000 32,511,000 -32,949,000 26,220,000 -27,391,000         19,428,000  -9,218,000 4,528,000 4,694,000  -3,254,000 -160,000 10,621,000  -10,533,000 6,270,000 9,276,000  
  accounts payable, accrued expenses, other liabilities and security deposits4,807,000 -8,182,000 -17,210,000 3,084,000 -10,372,000 -50,003,000 -11,681,000 20,958,000 -1,959,000 4,656,000 -52,184,000 1,578,000 -8,282,000 28,049,000 -12,378,000 6,583,000 -21,952,000 -38,640,000 88,915,000 3,938,000 53,195,000 -13,877,000 -44,334,000 13,438,000 18,214,000 -12,915,000  -2,152,000 3,977,000 18,890,000  12,083,000                                     
  deferred revenue-4,741,000 -5,097,000 -6,415,000 1,680,000 -3,081,000 3,017,000 -1,921,000 10,563,000 -3,035,000 2,450,000 1,124,000 19,880,000 -6,222,000 3,550,000 -9,139,000 6,524,000 -3,233,000 4,121,000 7,451,000 16,709,000 -11,125,000 7,622,000                                     910,000   -24,000 256,000 -575,000 2,955,000 -890,000 1,567,000  
  lease liability - operating leases-12,750,000 -4,320,000 -4,249,000 -4,202,000 -4,155,000 -4,097,000  -2,893,000 -2,679,000 -2,116,000  1,204,000 427,000 864,000  -2,057,000 -12,072,000 -19,160,000                                                   
  net cash from operating activities54,488,000 6,710,000 58,175,000 16,723,000 79,374,000 -24,677,000 48,165,000 77,346,000 61,643,000 42,349,000 26,460,000 67,193,000 101,033,000 81,402,000 64,967,000 87,748,000 84,662,000 18,602,000 226,293,000 103,638,000 182,279,000 42,026,000 77,040,000 81,518,000 155,602,000 62,313,000 123,992,000 71,333,000 151,666,000 94,546,000 131,752,000 102,899,000 197,563,000 116,159,000 135,414,000 259,288,000 114,090,000 89,540,000 142,500,000 90,959,000 113,175,000 100,644,000 188,414,000 88,148,000 75,749,000 96,966,000 110,963,000 102,525,000 141,104,000 56,831,000 60,848,000 97,039,000 79,809,000 62,438,000 88,318,000 54,372,000 32,968,000 34,098,000 16,960,000 33,822,000 12,064,000 39,689,000 30,689,000 12,145,000 21,231,000 30,898,000 13,976,000 27,080,000 
  investing activities                                                                    
  acquisitions of real estate property-112,440,000            -124,103,000   -86,846,000 -995,000 747,000   -20,207,000 -30,546,000 -8,457,000 -1,276,000 11,434,000 -25,095,000   -277,000 -37,728,000 -2,532,131,000 -36,266,000 -6,290,000 -328,093,000 -502,823,000   -536,410,000                        
  additions to land, buildings and improvements-61,819,000 -74,239,000 -49,178,000 -54,628,000 -52,747,000 -55,316,000 -65,628,000 -59,845,000 -72,272,000 -61,918,000 -105,773,000 -68,040,000 -65,277,000 -61,680,000 -94,106,000 -90,304,000 -68,748,000 -49,328,000 -176,489,000 -98,354,000 -81,571,000 -101,726,000 -102,244,000 -57,729,000 -53,489,000 -39,524,000 -90,710,000 -67,173,000 -44,946,000 -51,631,000 -84,095,000 -85,896,000 -64,172,000 -101,090,000 -112,064,000 -94,618,000 -62,500,000 -97,240,000 -75,403,000 -47,117,000 -86,940,000 -148,698,000 -86,036,000 -48,213,000 -87,722,000                        
  acquisition deposits and deferred purchase price  -10,233,000 -12,817,000        -15,000,000         -5,011,000 4,682,000 -4,910,000   1,500,000 -3,020,000                                       
  investments in unconsolidated joint ventures-20,337,000 -36,786,000 -79,285,000 -46,666,000 -301,452,000 -23,830,000 -64,959,000 -72,545,000 -23,992,000 -22,985,000 -37,920,000 -11,233,000 -123,966,000 -11,399,000 -12,401,000 -38,273,000 -17,171,000 -21,027,000 -30,591,000 -21,406,000 -9,412,000 -8,906,000 -14,632,000 -16,603,000 -24,096,000 -73,351,000 -101,593,000 -44,531,000 -203,147,000 -51,158,000 -276,552,000 -19,515,000 -85,182,000 -8,000,000 -44,033,000 -18,786,000 -6,603,000 -18,648,000 -25,363,000 -83,772,000 -164,823,000 -46,655,000 -151,566,000 -18,966,000 -30,144,000                        
  distributions in excess of cumulative earnings from unconsolidated joint ventures35,754,000 9,460,000 62,167,000 32,572,000 -4,810,000 71,545,000 31,685,000 36,061,000 31,011,000 41,812,000 49,525,000 27,241,000 48,887,000 16,089,000 20,607,000 332,540,000 397,765,000 19,692,000 20,272,000 28,209,000 22,575,000 53,516,000 16,444,000 17,335,000 21,577,000 23,664,000 24,394,000 29,832,000 36,198,000 142,694,000 40,267,000 185,790,000 55,877,000 37,811,000 10,059,000 66,409,000 95,004,000 40,000,000 3,513,000 45,546,000 77,372,000 1,110,000 85,141,000 72,558,000 22,925,000 8,678,000 5,784,000 5,333,000 27,520,000 16,652,000 5,664,000 6,385,000 95,704,000 13,297,000 3,459,000              
  net proceeds from disposition of real estate/joint venture interest2,410,000 93,520,000 250,874,000 21,009,000 430,722,000 26,420,000 10,006,000 450,042,000   272,511,000 261,859,000 91,994,000 110,326,000 143,095,000 335,373,000 62,800,000 779,345,000 83,217,000 158,664,000 91,156,000 69,354,000 422,000 124,037,000 14,489,000  132,015,000 350,468,000 409,867,000  93,901,000 20,082,000 3,000,000 503,529,000 1,776,718,000 139,594,000     99,350,000 148,880,000 109,196,000 8,914,000 212,849,000 5,852,000 3,011,000 23,088,000 9,655,000                  
  proceeds from sale or redemption of marketable securities42,134,000 10,973,000         4,161,000    4,528,000              766,000 54,363,000                                   
  investments in marketable securities  -6,764,000                                                                 
  investments in real estate loans held by consolidated securitization vehicles-49,296,000 -9,001,000                                                                  
  repayment of real estate loans held by consolidated securitization vehicles                                                                    
  other investments-30,690,000 -5,679,000 -14,185,000 -1,820,000 -2,760,000 -2,770,000 211,000 234,000 -79,000 -17,700,000 -187,000 112,000 1,298,000 209,000 37,799,000 6,509,000 -4,054,000 -54,000 36,400,000 3,403,000 -2,538,000 -4,786,000 -5,378,000 -1,435,000 -1,056,000 -39,903,000 23,781,000 -1,103,000 -21,687,000 -21,625,000 43,941,000 -18,707,000 21,721,000 11,219,000 1,116,000 -4,103,000 -2,274,000 -4,196,000 -5,424,000 -23,428,000 -4,614,000 22,167,000 -1,573,000 -17,160,000                        
  origination of debt and preferred equity investments-809,000 -11,786,000 -7,184,000 -851,000 -1,330,000 -6,945,000 -11,654,000 -43,395,000 -4,730,000 -5,578,000 -11,314,000 -10,958,000 -15,973,000 -13,122,000 -11,771,000 -9,776,000 -68,243,000 -5,905,000 -7,156,000 -88,223,000 -42,200,000 -223,374,000 -51,893,000 -32,475,000 -93,442,000 -430,034,000 -78,907,000 -48,734,000 -374,147,000 -229,428,000 -194,246,000 -81,147,000 -452,124,000 -402,453,000 -327,607,000 -110,077,000 -117,119,000 -74,041,000 -212,796,000 -174,420,000 -196,087,000 -164,273,000 -106,266,000 -150,464,000                         
  repayments or redemption of debt and preferred equity investments        56,888,000 118,000,000 6,405,000 56,250,000 25,668,000   59,626,000 64,358,000 487,719,000 151,548,000 449,749,000 315,242,000 108,513,000 218,879,000 149,702,000 236,004,000 55,696,000 261,641,000 105,238,000 44,536,000 251,171,000 411,969,000 248,880,000 146,118,000 272,253,000 262,300,000 82,830,000 26,954,000 227,607,000 288,908,000 59,890,000 522,000                         
  net cash from investing activities131,785,000 -176,273,000 156,228,000 -159,277,000 125,515,000 -3,713,000 -100,339,000 310,552,000 27,501,000 -66,369,000 152,491,000 137,990,000 121,828,000 13,496,000 106,704,000 245,356,000 621,340,000 20,181,000 681,407,000 -28,796,000 533,237,000 -129,418,000 355,394,000 225,504,000 -174,561,000 -291,843,000 181,430,000 232,168,000 -187,938,000 456,002,000 82,190,000 162,732,000 -293,577,000 29,804,000 278,426,000 1,787,890,000 338,857,000 -1,728,493,000 -488,230,000 230,297,000 28,428,000 -507,222,000 -246,240,000 -71,801,000 -385,970,000        30,999,000              6,985,000  
  financing activities                                                                    
  proceeds from mortgages and other loans payable6,787,000 89,253,000 3,550,000 407,000 493,000     197,784,000 178,887,000 5,309,000 8,470,000 11,447,000 9,381,000 10,391,000 53,117,000 486,579,000 541,093,000 101,103,000 53,912,000 271,720,000 317,480,000 109,872,000  128,550,000 111,460,000 99,115,000  8,000 1,197,000 778,445,000   227,892,000 1,599,597,000   150,000,000 400,000,000 1,480,387,000 121,216,000 276,839,000 980,333,000 1,005,000,000 108,500,000 50,000,000 650,000,000 40,000,000                
  repayments of mortgages and other loans payable-113,000 -3,550,000 -32,489,000 -1,501,000 -33,486,000 -1,501,000 -21,486,000 -1,441,000 -1,426,000 -1,473,000 -1,428,000 -199,166,000 -36,055,000 -55,715,000 -2,744,000 -7,306,000 -2,452,000 -362,542,000 -476,476,000 -443,557,000 -164,018,000 -102,777,000 -68,052,000 -118,394,000 -42,503,000 -1,127,000  -328,216,000 -13,458,000 -9,406,000  -12,813,000 -12,671,000 -680,572,000   -127,695,000 -192,148,000 -7,530,000 -481,608,000 -513,533,000 -192,242,000 -1,485,452,000 -10,772,000 -58,019,000                        
  proceeds from revolving credit facility, term loans and unsecured notes60,000,000 420,000,000  220,000,000 570,000,000 130,000,000                                                               
  repayments of revolving credit facility, term loans and unsecured notes-190,000,000 -250,000,000  -25,000,000 -680,000,000 -40,000,000                                                               
  proceeds from stock options exercised and drspp issuance56,000 75,000 38,017,000 14,171,000 43,000 77,000 86,000 97,000 158,000 184,000 186,000 140,000 110,000 89,000 943,000 146,000 116,000 351,000 440,000 202,000 198,000 166,000 32,000 39,000 216,000 47,000                                           
  proceeds from issuance of common stock-871,000                                                                   
  redemption of op units-10,224,000 -11,267,000 -6,686,000 -6,576,000 -6,307,000 -18,608,000 -176,000 -3,650,000 -30,000 -5,220,000 -5,585,000 -16,982,000 -62,000 -18,272,000 -11,773,000 -669,000 -13,261,000 -8,429,000 -847,000 -18,066,000 -11,577,000 -67,000 -154,000 -15,697,000                                           
  distributions to noncontrolling interests in other partnerships-1,380,000 -221,000 -6,486,000 -1,760,000 -1,524,000 -1,283,000 -1,163,000 -851,000 -627,000 -136,000 -1,531,000 -148,000 -2,897,000 -123,000 -1,228,000 -5,230,000 -63,000 -110,000 -72,342,000 -12,530,000 -104,000 -492,000 -207,000 -63,000 -208,000  -1,139,000 -448,000 -276,000  -44,480,000 -140,000 -469,000   -7,905,000 -1,880,000 -848,000 -110,867,000 -1,274,000 -1,393,000 -2,766,000 -1,586,000 -2,814,000                        
  contributions from noncontrolling interests in other partnerships1,310,000 3,386,000 4,761,000   3,352,000 3,266,000 -112,000 426,000 816,000   26,000 5,000 134,000 171,000 73,000 4,218,000 4,372,000 3,814,000 5,366,000 2,404,000 2,308,000 161,000  3,072,000 1,671,000 157,000  193,000 1,062,000 31,947,000   934,000 3,276,000   2,742,000 26,385,000 1,031,000 517,000 4,383,000 417,000 254,000 3,110,000 468,000 18,331,000                   
  distributions to noncontrolling interests in the operating partnership-3,807,000 -4,155,000 -3,370,000 -3,419,000 -3,517,000 -3,609,000 -3,554,000 -3,675,000 -3,728,000 -3,822,000 -3,637,000 -4,063,000 -4,157,000 -4,415,000 -3,867,000 -3,772,000 -3,962,000 -4,148,000 -3,795,000 -3,747,000 -3,826,000 -1,284,000 -3,736,000 -3,640,000 -3,710,000 -3,643,000  -3,757,000 -3,871,000 -3,841,000  -3,527,000 -3,575,000 -3,537,000   -2,881,000 -2,324,000 -2,344,000 -2,349,000 -2,367,000 -1,884,000 -2,098,000 -1,500,000 -1,451,000                        
  contributions from noncontrolling interests to debt fund investments                                                                    
  dividends paid on common and preferred stock-60,200,000 -60,196,000 -56,036,000 -54,325,000 -54,320,000 -54,142,000 -58,011,000 -57,937,000 -57,610,000 -57,373,000 -65,012,000 -65,568,000 -65,217,000 -66,339,000 -65,944,000 -66,758,000 -68,601,000 -69,772,000 -69,849,000 -70,673,000 -73,812,000 -79,662,000 -75,582,000 -76,344,000 -77,061,000 -77,399,000  -76,308,000 -78,970,000 -81,729,000  -83,023,000 -84,499,000 -84,179,000   -78,103,000 -64,610,000 -64,407,000 -62,903,000 -52,067,000 -51,964,000 -51,291,000 -51,652,000 -35,215,000                        
  tax withholdings related to restricted share awards-6,850,000 -6,850,000         -24,000 -3,000 -3,888,000 -1,000 -147,000 -54,000 -2,788,000 -4,752,000 -369,000 -3,126,000  3,858,000 -3,842,000                                       
  deferred loan costs-256,000 -651,000 -967,000 -129,000 -286,000 -60,000 -678,000 -99,000 -272,000 -358,000 -2,968,000 -139,000 -5,071,000 80,000 -13,175,000 -100,000 -182,000 -288,000 -35,349,000 -18,177,000 -15,948,000 -562,000                                               
  net cash from financing activities-180,484,000 174,953,000 -197,890,000 141,868,000 -207,574,000 11,367,000 78,370,000 -389,634,000 -135,347,000 -2,772,000 -179,975,000 -97,166,000 -253,118,000 -124,564,000 -180,620,000 -303,672,000 -791,108,000 -9,971,000 -839,354,000 -871,676,000 -235,255,000 466,984,000 -407,548,000 -331,625,000 -35,605,000 246,128,000  -424,889,000 37,987,000 -422,309,000  -295,107,000 -101,056,000 42,629,000   -392,141,000 1,667,417,000 230,856,000 -271,895,000 -113,714,000 351,995,000 -81,233,000 224,123,000 307,815,000   102,085,000 245,885,000 232,834,000     280,046,000 -88,462,000 102,571,000 154,864,000 146,612,000 -92,490,000   2,043,000      
  net decrease in cash, cash equivalents, and restricted cash5,789,000 5,390,000  -686,000 -2,685,000 -17,023,000   -46,203,000 -26,792,000                                                           
  cash, cash equivalents, and restricted cash at beginning of year331,638,000 335,519,000 384,054,000 336,984,000 372,795,000 241,430,000 279,113,000  250,026,000                                       
  cash, cash equivalents, and restricted cash at end of period5,789,000 337,028,000 16,513,000 -686,000 -2,685,000 318,496,000 26,196,000 -1,736,000 -46,203,000 357,262,000 -1,024,000 108,017,000 -30,257,000 307,318,000 -8,949,000 29,432,000 -85,106,000 401,607,000 68,346,000 -796,834,000 480,261,000 621,022,000 24,886,000 -24,603,000 -54,564,000 295,711,000  -121,388,000 1,715,000 378,265,000                                       
  supplemental disclosure of non-cash investing and financing activities:                                                                    
  measurement adjustment for redeemable noncontrolling interest9,953,000 12,940,000                                                                   
  conversion of partner loan                                                                    
  investment in joint venture                                                                  
  consolidation of a subsidiary  43,699,000 6,678,000                                                               
  consolidation of mortgage loan payable   205,000,000                                                               
  acquisition of subsidiary interest from noncontrolling interest  -12,963,000 5,674,000            -1,536,000 -54,000              17,130,000 3,500,000                             
  transfer of investments to debt fund                                                                    
  contribution to consolidated joint venture interest51,000      8,134,000                                                           
  extinguishment of debt  28,835,000                                                                 
  debt and preferred equity investments           3,188,000 -4,816,000 10,000,000                                                   
  removal of fully depreciated commercial real estate properties1,652,000 1,095,000 2,129,000 189,000 1,231,000 3,354,000 8,566,000 3,500,000 4,247,000  451,000 2,946,000 651,000  2,742,000 3,168,000 1,120,000 58,263,000 7,372,000 22,000 512,000 12,975,000 874,000 1,716,000 4,012,000  4,726,000 4,452,000 106,142,000  5,404,000 3,711,000 2,043,000   4,822,000                                
  share repurchase or redemption payable  4,582,000 -80,000 5,012,000                                                               
  consolidation of securitization vehicle assets828,143,000                                                                  
  consolidation of securitization vehicle liabilities828,143,000                                                                  
  equity in net income from unconsolidated joint ventures -1,170,000     32,039,000 15,126,000 21,932,000 7,412,000 26,696,000 21,997,000 4,550,000 4,715,000 24,081,000 15,487,000 12,970,000 2,864,000  432,000 2,199,000 12,814,000     2,398,000 -971,000 -4,702,000 -4,036,000 -7,788,000 -4,078,000 -3,412,000 -6,614,000 3,968,000 -5,841,000 -10,096,000 -3,627,000 -2,994,000 -4,030,000 -5,756,000 -6,033,000 -8,620,000 -6,128,000 -5,670,000                        
  equity in net (gain) loss on sale of interest in unconsolidated joint venture/real estate                                                                    
  depreciable real estate reserves and impairments                                                                    
  (gain) loss on sale of real estate  1,705,000                  -64,884,000 -72,636,000      2,504,000                                         
  loan loss and other investment reserves, net of recoveries                                                                    
  (gain) loss on early extinguishment of debt                                           -3,000                         
  cash and restricted cash assumed from acquisition and consolidation of real estate investment                                                                    
  proceeds from revolving credit facility, term loans and senior unsecured notes                                                                    
  repayments of revolving credit facility, term loans and senior unsecured notes                                                                    
  repurchase of common stock          -151,197,000 -60,780,000 -101,957,000 -94,577,000 -84,089,000 -146,491,000 -29,944,000 -132,472,000 -219,576,000 -209,394,000 -65,692,000 -75,070,000 -34,243,000  -35,377,000 -342,017,000 -382,679,000  -138,392,000 -211,497,000 -102,000                                   
  redemption of preferred stock        1,000 -1,000 -17,967,000 -2,409,000 -3,631,000 -22,950,000 -40,408,000 -19,392,000      -200,000 -150,000      -440,000        -33,000                        
  other obligation related to secured borrowing                                                                    
  net increase in cash, cash equivalents, and restricted cash      26,196,000    -1,024,000   -29,666,000 -8,949,000 29,432,000 -85,106,000 28,812,000 68,346,000 -796,834,000 480,261,000 379,592,000 24,886,000 -24,603,000 -54,564,000 16,598,000  -121,388,000 1,715,000 128,239,000                                       
  supplemental cash flow disclosures:                                                                    
  interest paid                                                       16,254,000 22,607,000 19,355,000 15,920,000 17,586,000 15,357,000 15,072,000 13,701,000 11,893,000 12,489,000 11,333,000 8,541,000 679,000 
  income taxes paid                                                                    
  exchange of preferred equity investment for real estate or equity in joint venture                 30,000                                                 
  exchange of debt investment for real estate or equity in joint venture               18,585,000                                                  
  assumption of mortgage and mezzanine loans                                                                   
  issuance of special dividend paid in stock                                                                    
  tenant improvements and capital expenditures payable          8,223,000 1,595,000 8,700,000 -9,104,000 7,773,000 -6,303,000 15,214,000 -10,328,000 5,340,000 6,051,000 602,000 -3,984,000 1,019,000 -329,000 9,350,000  -288,000 582,000 15,952,000  1,716,000 123,000 7,087,000   18,165,000 -3,191,000 -3,000 17,664,000 952,000 1,264,000 -2,706,000 9,898,000 -9,353,000                        
  deconsolidation of a subsidiary                                                                 
  deconsolidation of subsidiary debt                                                                    
  contribution to consolidated joint venture by noncontrolling interest                                                                  
  recognition of right of use assets and related lease liabilities                119,711,000  -57,474,000 12,192,000 102,782,000 389,120,000                                           
  equity in net (income) income from unconsolidated joint ventures   15,428,000 -4,325,000 -111,160,000                                                               
  equity in net (gain) loss on sale of interest in unconsolidated joint venture interest/real estate   -371,000 8,129,000 -26,764,000                    -17,166,000                -16,496,000                           
  other obligations related to secured borrowing           77,874,000                                                       
  fair value adjustment to noncontrolling interest in the operating partnership   34,923,000 -364,000 42,841,000 7,414,000 -3,126,000 1,051,000 10,147,000 16,435,000 18,454,000 -37,938,000 43,023,000 -7,394,000 -15,230,000 5,866,000 26,609,000 -2,655,000 4,109,000                  10,994,000 -24,786,000 45,456,000 59,986,000 528,000 78,461,000 29,464,000 7,166,000                        
  share issuance receivable                                                                    
  equity in net income on sale of interest in unconsolidated joint venture interest/real estate      13,289,000 79,000     1,280,000 -8,471,000 12,629,000                                                   
  gain on sale of real estate          23,381,000 -4,276,000    -187,766,000 -98,960,000 1,388,000     19,241,000 -3,541,000 1,049,000    -23,521,000 -76,497,000 3,823,000 -567,000 -397,000 -196,580,000 -13,773,000                                
  loss on early extinguishment of debt                          14,889,000             6,865,000 24,475,000    -7,545,000 18,513,000                     
  change in lease liability - operating leases                  -2,839,000 -2,802,000 -2,769,000 -2,959,000                                               
  cash and restricted cash assumed from acquisition of real estate investment                                                                   
  cash assumed from consolidation of real estate investment              9,475,000                                                   
  purchases of marketable securities                                -22,731,000   -7,769,000                             
  principal payments on financing lease liabilities                                                                    
  redemption of units in the operating partnership for a joint venture sale                                                                  
  transfer of assets related to assets held for sale                           140,013,000    99,537,000 119,224,000 54,694,000                                   
  transfer of liabilities related to assets held for sale                           44,958,000    1,141,000 106,000 43,000   1,612,001,000                                
  extinguishment of debt in connection with property dispositions               53,548,000                                                   
  consolidation of real estate investment               119,444,000                                                   
  sale of interest in partially owned entity                                                                    
  distributions to noncontrolling interests                                                                    
  issuance of special dividend paid primarily in stock           160,620,000 -2,111,000 123,529,000                                                   
  proceeds from revolving credit facility and unsecured notes        80,000,000 143,000,000  792,000,000 12,000,000 320,000,000  355,000,000 40,000,000 530,000,000                                                   
  repayments of revolving credit facility and unsecured notes        -140,000,000 -78,000,000  -772,000,000 -382,000,000 -210,000,000  -485,000,000 -670,000,000 -10,000,000                                                   
  equity in net gain on sale of interest in unconsolidated joint venture interest/real estate                        -167,445,000 -70,937,000 -72,025,000 6,440,000 -1,030,000 -13,089,000 -2,047,000 -225,000 -33,448,000 -9,915,000 -15,281,000      -104,640,000                         
  proceeds from revolving credit facility and senior unsecured notes                  220,000,000 150,000,000 1,125,000,000 220,000,000 150,000,000 420,000,000 520,000,000  730,000,000 1,020,000,000 455,000,000  375,000,000 795,000,000 277,800,000   520,000,000 1,075,000,000 390,000,000 665,000,000         168,339,000 300,000,000 675,989,000 266,529,000 458,550,000               
  repayments of revolving credit facility and senior unsecured notes                  -300,000,000 -760,000,000 -500,000,000 -315,000,000 -315,000,000 -485,000,000 -540,000,000 -230,000,000  -845,000,000 -660,000,000 -495,000,000  -395,107,000 -597,897,000 -277,800,000   -994,296,000 -731,000,000 -205,007,000 -530,000,000                             
  principal payments of on financing lease liabilities              -179,000 -255,000 -253,000 -250,000                                                 
  conversion of units in the operating partnership                  8,660,000 84,000                                               
  deconsolidation of a subsidiary mortgage                                                                  
  mortgages assumed in connection with sale of real estate                                                                   
  seller financed purchases                  100,000,000                                               
  share repurchase payable                16,442,000 3,779,000  1,183,000        10,141,000 3,670,000 27,935,000                                       
  assumption of mortgage loan                                                                   
  issuance of preferred units relating to a real estate acquisition                                                                    
  reversal of assets held for sale                  391,664,000                                               
  payment of debt extinguishment costs                                        -26,818,000                            
  other obligations related to loan participations                           -3,839,000    6,737,000                                     
  debt and preferred equity reserves                   4,638,000                                               
  recognition of sales-type leases and related lease liabilities                                                                    
  proceeds from sale of marketable securities                                  1,688,000   137,000 162,000 133,000 4,579,000 114,000                           
  issuance of units in the operating partnership                             15,448,000  2,449,000 2,584,000 18,240,000   18,140,000 2,657,000 3,127,000 22,114,000 33,607,000 3,402,000 2,146,000 17,314,000 10,480,000                        
  issuance of preferred units relating to the real estate acquisition                                    22,750,000                                
  transfer of assets to assets held for sale                                    1,891,575,000                                
  366.6 million of the 2017 amount relates to 1515 broadway. in november 2017, the company sold a 30.13% interest in 1515 broadway to affiliates of allianz real estate. the sale did not meet the criteria for sale accounting and as a result the property was accounted for under the profit sharing method. the company achieved sale accounting upon adoption of asc 610-20 in january 2018 and closed on the sale of an additional 12.87% interest in the property to allianz in february 2018.                                                                    
  deferred revenue and land leases payable                       18,682,000 -11,148,000 10,721,000 -5,290,000 16,517,000 -3,571,000 4,692,000 -8,754,000 25,890,000 3,871,000 25,600,000 22,935,000 -21,222,000 17,303,000 20,806,000 -11,184,000 14,056,000     -15,574,000 14,629,000 -11,494,000 19,596,000  7,620,000   3,073,000                
  redemption of preferred units                       -15,142,000                                           
  deferred loan costs and capitalized lease obligation                       -6,444,000 -11,257,000 -3,367,000  -6,721,000 -1,107,000 -429,000  -472,000 -809,000 -7,712,000   -7,403,000 -19,381,000 47,000 -4,405,000 -6,746,000 -6,397,000 -40,555,000 -3,426,000                         
  conversion of units in the operating partnership for common stock                       25,000 446,000                                          
  redemption of units in the operating partnership for the sale of a joint venture                                                                    
  fair value adjustment to noncontrolling interest in operating partnership                       -28,326,000 14,903,000 28,932,000  2,955,000 848,000 3,645,000  -10,043,000 -2,836,000 15,548,000   25,867,000                                
  deconsolidation of subsidiaries                           -12,000 298,403,000  -1,000                                     
  derivative instruments at fair value                             6,937,000  596,000 2,032,000 4,734,000   8,141,000 3,459,000 -2,426,000 4,426,000 -1,483,000 -4,375,000 16,978,000 110,000 142,000                        
  deferred leasing payable                             1,203,000  10,000 -655,000 1,455,000   1,699,000 651,000 3,153,000 2,372,000 -4,419,000 12,427,000                           
  amortization of lease liabilities                         3,367,000                                           
  purchase price and other fair value adjustment                                                                    
  (gain) loss on sale of investments in marketable securities                                                                  
  accounts payable, accrued expenses and other liabilities and security deposits                                 -16,327,000 5,546,000 -13,005,000 -20,630,000 23,106,000 3,243,000 -20,230,000 -25,241,000 4,472,000 14,794,000 -1,821,000                         
  proceeds from disposition of real estate/joint venture interest                                     580,577,000 6,058,000 485,540,000                             
  depreciable real estate reserves                              93,184,000 29,064,000 56,272,000                                 
  proceeds from stock options exercised and drip issuance                           9,988,000 4,930,000 771,000  769,000 2,898,000 8,808,000   1,256,000    4,726,000 772,000 10,785,000 8,992,000 2,519,000 1,457,000 4,449,000 4,546,000 3,106,000 102,089,000 1,181,000 3,295,000 3,802,000                
  bond repurchase payable                                                                    
  redemption of units in the operating partnership for stock                               2,110,000 130,000 13,112,000                                   
  purchase price fair value adjustment                                                                
  gain on sale of discontinued operations                                     -12,983,000 -18,817,000 -29,507,000                          
  restricted cash—operations                              627,000 1,497,000 -516,000 5,539,000 -2,786,000 -4,751,000 -5,318,000 -22,191,000 406,000 -1,652,000 7,985,000 -2,274,000 5,670,000 -10,520,000                         
  escrowed cash—capital improvements/acquisition deposits/deferred purchase price                              -20,930,000 5,451,000 -503,000 12,483,000 9,763,000 16,161,000 60,059,000                                
  net increase in cash and cash equivalents                               -29,476,000 -197,070,000 188,592,000   60,806,000 28,464,000 -114,874,000 49,361,000 27,889,000 -54,583,000 -139,059,000 240,470,000 -2,406,000 10,129,000 -21,135,000 30,120,000   4,276,000                  
  cash and cash equivalents at beginning of year                               279,443,000   255,399,000 281,409,000                             
  cash and cash equivalents at end of period                               -29,476,000 -197,070,000 468,035,000   316,205,000 28,464,000    -54,583,000 -139,059,000 447,162,000  10,129,000 -21,135,000 220,104,000 123,134,000 133,665,000 4,276,000 156,220,000 234,009,000 -42,696,000 -52,135,000 9,911,000 12,215,000 -14,811,000 16,789,000 12,496,000 -41,746,000 42,652,000 22,393,000 24,375,000 -2,639,000 -7,809,000 24,619,000 44,570,000 
  included in other non-cash adjustments is 172.4 million for the nine months ended september 30, 2016 for the amortization of the below-market lease at 388-390 greenwich street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale.                                                                    
  exchange of debt investment for equity in joint venture                                    68,581,000 10,151,000                             
  issuance of slg's common stock to consolidated joint venture                                                                    
  included in other non-cash adjustments is 172.4 million for the six months ended june 30, 2016 for the amortization of the below-market lease at 388-390 greenwich street as a result of the tenant exercising their option to purchase the property and entering into an agreement to accelerate the sale.                                                                    
  proceeds from sale held in restricted cash                                                                    
  other obligations related to mortgage loan participations                                    76,500,000 25,000,000                             
  loss on sale of investments in marketable securities                                                                   
  proceeds from sale of common stock                                     -205,000                               
  issuance of common stock as deferred compensation                                    2,195,000 106,000 332,000 1,306,000 98,000 97,000 111,000 1,295,000 -270,000                       
  redemption of units in the operating partnership                                    7,153,000 3,613,000 585,000 37,407,000 5,261,000 3,326,000 6,483,000 16,583,000                        
  transfer of restricted cash to operating cash and cash equivalents as a result of sale                                     21,578,000                             
  issuance of preferred units                                     157,793,000 13,808,000 40,000,000                             
  proceeds from stock options exercised and drssp issuance                                     1,092,000 1,467,000 109,840,000                             
  redemption of preferred unit                                     -200,000                             
  capital lease asset                                                                    
  reclass of development costs from other assets to real estate                                                                    
  transfer to net assets held for sale                                     -302,684,000   -291,027,000 413,648,000 275,884,000 63,925,000                         
  transfer to liabilities related to net assets held for sale                                     -178,158,000   -195,018,000 268,516,000 143,671,000 49,704,000                         
  transfer of financing receivable to debt investment                                        19,675,000                         
  consolidation of real estate                                                                   
  deconsolidation of subsidiary                                                                    
  issuance of common stock                                                                    
  issuance of common stock to consolidated joint venture                                                                    
  receivable from sale of unconsolidated joint venture interest                                                                    
  escrowed cash—capital improvements/acquisition deposits                                      -226,769,000 -3,084,000 59,407,000 -29,641,000 -3,366,000 -34,861,000                         
  net proceeds from sale of common stock                                       120,597,000 142,623,000 33,948,000 8,726,000 24,000     78,354,000 122,953,000 96,887,000 257,749,000 161,714,000 -94,000       64,995,000 73,635,000      
  cash and cash equivalents at end of year                                       330,770,000                             
  net proceeds from sale of preferred stock                                                            37,448,000        
  sale or purchase of treasury stock                                            1,031,000                        
  assignment of debt investment to joint venture                                                                    
  mortgage assigned to joint venture                                                                    
  assumption of mortgage loans                                                                   
  consolidation of real estate investments and other adjustments                                                                    
  repayment of mezzanine loans                                                                    
  redemption of series e units                                                                    
  repayment of financing receivable                                                                    
  capital leased asset                                                                   
  deferred revenue and deferred land leases payable                                         20,820,000 -11,847,000 14,635,000                         
  purchase of marketable securities                                                                   
  proceeds from revolving credit facility, term loan and senior unsecured notes                                         453,400,000 80,000,000 603,000,000                         
  repayments of revolving credit facility, term loan and senior unsecured notes                                         -285,298,000 -80,000,000 -440,690,000                         
  sale of treasury stock                                                                    
  cash and cash equivalents at beginning of period                                         206,692,000  189,984,000 138,192,000 332,830,000 35,795,000 38,546,000 58,020,000 
  issuance of preferred units of limited partnership interest in the operating partnership                                         23,565,000                           
  equity in net gain on sale of interest in unconsolidated joint venture interest/ real estate                                                                    
  gain on sale of debt securities                                                                    
  accounts payable, accrued expenses and other liabilities                                            -25,108,000 21,842,000 924,000 869,000 5,491,000 4,118,000     -355,000 9,860,000 11,745,000   16,864,000 4,753,000    1,617,000   9,309,000 
  debt and preferred equity and other investments, net of repayments/participations                                            23,740,000 -72,031,000      -15,751,000 100,279,000                
  accrued acquisition liabilities                                                                    
  consolidation of real estate investments—noncontrolling interest in other partnerships                                                                    
  restricted cash — operations                                             -4,873,000 680,000 5,447,000                     
  escrowed cash — capital improvements/acquisition                                                                    
  proceeds from credit facility and senior unsecured notes                                             474,000,000 215,000,000 155,000,000                     
  repayments of credit facility and senior unsecured notes                                                                    
  net proceeds from sale of common stock/preferred stock                                             33,280,000                       
  deferred loan costs and capitalized lease obligations                                                                    
  mortgage assigned upon asset sale                                                                    
  repayment of mezzanine loan                                                                    
  depreciable real estate reserves, net of recoveries                                                                    
  escrowed cash — capital improvements/acquisition deposits                                               191,000                     
  purchases of treasury stock                                                                    
  adjustment to reconcile net income to net cash from operating activities:                                                                    
  equity in net gain on sale of interest in unconsolidated joint venture                                                                    
  loss on investments in marketable securities                                                  6,000 127,000                
  purchase of treasury stock                                                                    
  distributions to noncontrolling interests in operating partnership                                                                    
  equity in net gain on sale of joint venture interest/ real estate                                                                    
  loan loss and other investment reserves                                                 564,000                   
  net decrease in cash and cash equivalents                                                                    
  restricted cash – operations                                                  -13,730,000          -5,864,000 5,969,000 1,332,000     2,642,000 
  escrowed cash – capital improvements/acquisition deposits                                                  -6,975,000 886,000 45,975,000                
  redemption of noncontrolling interest in operating partnership                                                                    
  deferred loan costs, capitalized lease obligation and other obligations                                                                    
  (gain) loss on sale of discontinued operations                                                                    
  equity in net gain on sale of unconsolidated joint venture interests/ real estate                                                                    
  loss on equity investment in marketable securities                                                     -52,000               
  net proceeds from disposition of real estate/ partial interest in property                                                     1,939,000               
  structured finance and other investments net of repayments/participations                                                     -15,258,000               
  proceeds from mortgage notes and other loans payable                                                                    
  repayments of mortgage notes and other loans payable                                                                    
  net proceeds from sale of preferred/common stock                                                                    
  deferred compensation - treasury stock                                                                    
  redemption of noncontrolling interests in operating partnership                                                                    
  equity in net gain on sale of unconsolidated joint ventures                                                                    
  repayments of mortgage notes payable                                                                    
  proceeds from mortgage notes payable                                                     185,098,000 120,505,000 97,501,000       209,708,000 292,000 35,000,000  
  net gain on sale of unconsolidated joint ventures/ real estate                                                                    
  loan loss reserves                                                     16,100,000               
  proceeds from stock options exercised                                                      1,969,000  289,000    9,010,000 2,119,000 7,099,000 708,000 110,000 3,189,000 3,585,000 497,000 
  distributions of cumulative earnings from unconsolidated joint ventures/ real estate                                                                    
  distributions to noncontrolling interest in operating partnership                                                                    
  minority interests                                                      6,086,000              
  deferred revenue and land lease payable                                                      -4,253,000              
  proceeds from asset sale                                                                   
  proceeds from revolving credit facility, term loan and unsecured notes                                                                    
  repayments of revolving credit facility and term loan                                                                    
  minority interest in other partnerships                                                                   
  dividends and distributions paid                                                                    
  equity from net income from unconsolidated joint ventures                                                                    
  distributions of cumulative earnings of unconsolidated joint ventures                                                                    
  equity in net gain on sale of unconsolidated joint venture/ partial interest                                                                    
  escrowed cash – capital improvements/acquisitions deposits                                                                    
  net proceeds from disposition of rental property                                                               55,811,000 786,000 62,478,000  
  proceeds from revolving credit facilities, term loans and unsecured notes                                                      877,650,000              
  repayments of revolving credit facilities, term loans and unsecured notes                                                                    
  supplemental cash flow disclosures                                                                    
  non-cash adjustments related to income from discontinued operations                                                       -19,000 -11,000 2,060,000 133,000 5,381,000        56,000 
  proceeds from disposition of real estate/ partial interest in property                                                                    
  minority interest                                                       947,000 2,276,000 1,373,000 1,576,000 1,215,000 892,000 2,643,000 943,000 1,487,000 972,000 1,033,000 1,132,000 1,165,000 
  net proceeds from common stock issued for reckson merger                                                                    
  repayments of revolving credit facilities and term loans                                                                    
  other financing activities                                                                    
  equity in gain on sale of unconsolidated joint venture/ partial interest                                                                    
  restricted cash — capital improvements/acquisitions                                                                    
  proceeds from revolving credit facilities and term loans                                                          264,000,000 193,000,000 460,000,000 153,900,000 34,000,000      
  proceeds from stock options exercised and dividend reinvestment plan                                                          13,928,000          
  net proceeds from sale of common/preferred stock                                                                    
  proceeds from disposition of real estate                                                                   
  proceeds from revolving credit facilities, and term loans                                                                    
  proceeds from sale of partial interest in property                                                                    
  equity in net income (income) from affiliates                                                                  
  equity in gain on sale of unconsolidated joint venture                                                                    
  restricted cash – capital improvements/acquisitions                                                            -28,000 -69,000 10,442,000     814,000 
  investment in and advances to affiliates                                                               1,711,000 501,000 149,000  
  capitalized lease obligation                                                           57,000 57,000 81,000 79,000 78,000 78,000 75,000 75,000 -33,000 
  distributions from unconsolidated joint ventures                                                        50,170,000 6,470,000 11,998,000 16,746,000 34,396,000 132,517,000 9,485,000 13,920,000 14,028,000 2,955,000 5,566,000 8,117,000 
  structured finance investments net of repayments/participations                                                                    
  proceeds from revolving credit facilities, term loans and trust preferred securities                                                        258,000,000            
  escrowed cash capital improvements/acquisition deposits                                                                    
  amortization of discount on structured finance investments                                                                   98,000 
  allowance for bad debts                                                          510,000 358,000 726,000 177,000 127,000 -66,000 723,000 786,000 163,000 45,000 
  amortization of deferred compensation                                                          983,000 1,104,000 722,000 591,000 4,900,000 1,939,000 615,000 616,000 616,000  
  deferred land lease payable                                                          160,000 77,000 160,000 160,000 160,000 60,000 160,000 160,000 160,000 160,000 
  restricted cash - operations                                                                    
  distribution from affiliate                                                                   
  equity in net income from affiliates                                                                  97,000  
  equity in gain on sale of unconsolidated joint ventures                                                                    
  acquisitions of and deposits on real estate property                                                                    
  cumulative effect of change in accounting principle                                                                    
  gain on sale of rental properties                                                                    
  write-off of deferred financing costs                                                                    
  repayments of revolving credit facilities                                                                    
  net proceeds from dividend reinvestment plan                                                                    
  non-cash adjustment related to income from discontinued operations                                                                404,000 713,000 1,416,000  
  acquisition of real estate property                                                                    
  investment in unconsolidated joint ventures                                                                    
  structured finance investments, net of repayments/participations                                                                    
  net cash from investment activities                                                                    
  proceeds from revolving credit facilities and term loan                                                                152,000,000 12,000,000 106,000,000  
  net cash (used in) financing activities                                                                    
  gain on sale of rental properties/preferred investment                                                                    
  supplemental disclosure of non-cash investing and financing activities                                                                    
  cancellation of common stock as deferred compensation                                                                   
  contribution of property to joint venture                                                                    
  mortgage notes payable assigned to joint venture                                                                    
  unrealized loss on derivative instruments                                                                   5,594,000 
  equity in net (income) income from affiliates                                                                    
  amortization for deferred compensation                                                                    
  additions to real estate property                                                                    
  proceeds from revolving credit facilities                                                                    
  net increase/(decrease) in cash and cash equivalents                                                                    
  extraordinary item, net of minority interest                                                                    
  allowance for deferred rents and bad debts                                                                    
  amortization for officer loans and deferred compensation                                                                    
  structured finance investments                                                                    
  assets acquired                                                                    
  liabilities assumed                                                                    
  mortgage notes payable assumed by joint venture                                                                    

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