Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Rental revenue, net	$ 184,611	$ 195,886	$ 372,700	$ 418,517
Investment income	20,107	39,943	39,380	78,476
Other income	13,389	17,870	32,129	71,009
Total revenues	218,107	253,699	444,209	568,002
Expenses
Operating expenses, including related party expenses of $3,039 and $5,264 in 2021 and $2,739 and $6,488 in 2020	43,883	40,897	86,167	94,763
Real estate taxes	43,768	41,661	89,179	88,283
Operating lease rent	6,707	7,831	13,446	15,198
Interest expense, net of interest income	18,960	30,070	42,348	67,564
Amortization of deferred financing costs	3,386	2,661	7,160	5,161
Depreciation and amortization	57,261	95,941	120,257	164,220
Loan loss and other investment reserves, net of recoveries	0	6,813	0	18,061
Transaction related costs	3	373	25	438
Marketing, general and administrative	22,064	23,510	44,949	43,080
Total expenses	196,032	249,757	403,531	496,768
Equity in net loss from unconsolidated joint ventures	(12,970)	(2,199)	(15,834)	(15,013)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	8,471	0	(4,158)	0
Purchase price and other fair value adjustments	(1,947)	0	717	0
Gain on sale of real estate, net	98,960	64,884	97,572	137,520
Depreciable real estate reserves and impairment	2,545	0	(5,696)	0
Net income	117,134	66,627	113,279	193,741
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(6,282)	(3,070)	(5,806)	(9,272)
Noncontrolling interests in other partnerships	40	(1,023)	1,539	(730)
Preferred units distributions	(1,823)	(2,353)	(3,669)	(5,019)
Net income (loss) attributable to SL Green/SLGOP	109,069	60,181	105,343	178,720
Perpetual preferred stock dividends	(3,737)	(3,737)	(7,475)	(7,475)
Net income attributable to SL Green common stockholders	$ 105,332	$ 56,444	$ 97,868	$ 171,245
Basic earnings per share (usd per share)	$ 1.52	$ 0.76	$ 1.41	$ 2.28
Diluted earnings per share (usd per share)	$ 1.51	$ 0.76	$ 1.40	$ 2.28
Basic weighted average common shares outstanding (in shares)	68,980	73,538	68,996	74,598
Diluted weighted average common shares and common share equivalents outstanding (in shares)	73,727	78,066	73,899	79,208
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 184,611	$ 195,886	$ 372,700	$ 418,517
Investment income	20,107	39,943	39,380	78,476
Other income	13,389	17,870	32,129	71,009
Total revenues	218,107	253,699	444,209	568,002
Expenses
Operating expenses, including related party expenses of $3,039 and $5,264 in 2021 and $2,739 and $6,488 in 2020	43,883	40,897	86,167	94,763
Real estate taxes	43,768	41,661	89,179	88,283
Operating lease rent	6,707	7,831	13,446	15,198
Interest expense, net of interest income	18,960	30,070	42,348	67,564
Amortization of deferred financing costs	3,386	2,661	7,160	5,161
Depreciation and amortization	57,261	95,941	120,257	164,220
Loan loss and other investment reserves, net of recoveries	0	6,813	0	18,061
Transaction related costs	3	373	25	438
Marketing, general and administrative	22,064	23,510	44,949	43,080
Total expenses	196,032	249,757	403,531	496,768
Equity in net loss from unconsolidated joint ventures	(12,970)	(2,199)	(15,834)	(15,013)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	8,471	0	(4,158)	0
Purchase price and other fair value adjustments	(1,947)	0	717	0
Gain on sale of real estate, net	98,960	64,884	97,572	137,520
Depreciable real estate reserves and impairment	2,545	0	(5,696)	0
Net income	117,134	66,627	113,279	193,741
Net income attributable to noncontrolling interests:
Noncontrolling interests in other partnerships	40	(1,023)	1,539	(730)
Preferred units distributions	(1,823)	(2,353)	(3,669)	(5,019)
Net income (loss) attributable to SL Green/SLGOP	115,351	63,251	111,149	187,992
Perpetual preferred unit distributions	(3,737)	(3,737)	(7,475)	(7,475)
Net income attributable to SLGOP common unitholders	$ 111,614	$ 59,514	$ 103,674	$ 180,517
Basic earnings per unit (usd per share)	$ 1.52	$ 0.76	$ 1.41	$ 2.28
Diluted earnings per unit (usd per share)	$ 1.51	$ 0.76	$ 1.40	$ 2.28
Basic weighted average common units outstanding (in shares)	73,073	77,658	73,117	78,768
Diluted weighted average common units and common unit equivalents outstanding (in shares)	73,727	78,066	73,899	79,208