Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues
Rental revenue, net	$ 155,363	$ 195,515	$ 528,063	$ 614,032
Investment income	20,072	22,988	59,452	101,464
Other income	29,766	31,341	61,895	102,350
Total revenues	205,201	249,844	649,410	817,846
Expenses
Operating expenses, including related party expenses of $3,563 and $8,827 in 2021 and $2,801 and $9,289 in 2020	40,684	45,910	126,851	140,673
Real estate taxes	32,139	43,522	121,318	131,805
Operating lease rent	6,557	6,973	20,003	22,171
Interest expense, net of interest income	14,807	23,536	57,155	91,100
Amortization of deferred financing costs	2,345	3,151	9,505	8,312
Depreciation and amortization	49,277	92,516	169,534	256,736
Loan loss and other investment reserves, net of recoveries	0	8,957	0	27,018
Transaction related costs	190	45	215	483
Marketing, general and administrative	23,477	23,602	68,426	66,682
Total expenses	169,476	248,212	573,007	744,980
Equity in net loss from unconsolidated joint ventures	(15,487)	(432)	(31,321)	(15,445)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(1,280)	0	(5,438)	0
Purchase price and other fair value adjustments	208,810	0	209,527	0
Gain on sale of real estate, net	187,766	26,104	285,338	163,624
Depreciable real estate reserves and impairment	0	(6,627)	(5,696)	(6,627)
Net income	415,534	20,677	528,813	214,418
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(22,683)	(802)	(28,489)	(10,073)
Noncontrolling interests in other partnerships	915	(414)	2,454	(1,145)
Preferred units distributions	(1,823)	(1,864)	(5,492)	(6,883)
Net income (loss) attributable to SL Green/SLGOP	391,943	17,597	497,286	196,317
Perpetual preferred stock dividends	(3,738)	(3,738)	(11,213)	(11,213)
Net income attributable to SL Green common stockholders	$ 388,205	$ 13,859	$ 486,073	$ 185,104
Basic earnings per share (usd per share)	$ 5.77	$ 0.19	$ 7.08	$ 2.51
Basic earnings per unit (usd per share)	5.77
Diluted earnings per share (usd per share)	$ 5.75	$ 0.19	$ 7.04	$ 2.50
Basic weighted average common shares outstanding (in shares)	66,840	70,943	68,275	73,373
Diluted weighted average common shares and common share equivalents outstanding (in shares)	71,487	75,414	73,087	77,937
SL Green Operating Partnership
Revenues
Rental revenue, net	$ 155,363	$ 195,515	$ 528,063	$ 614,032
Investment income	20,072	22,988	59,452	101,464
Other income	29,766	31,341	61,895	102,350
Total revenues	205,201	249,844	649,410	817,846
Expenses
Operating expenses, including related party expenses of $3,563 and $8,827 in 2021 and $2,801 and $9,289 in 2020	40,684	45,910	126,851	140,673
Real estate taxes	32,139	43,522	121,318	131,805
Operating lease rent	6,557	6,973	20,003	22,171
Interest expense, net of interest income	14,807	23,536	57,155	91,100
Amortization of deferred financing costs	2,345	3,151	9,505	8,312
Depreciation and amortization	49,277	92,516	169,534	256,736
Loan loss and other investment reserves, net of recoveries	0	8,957	0	27,018
Transaction related costs	190	45	215	483
Marketing, general and administrative	23,477	23,602	68,426	66,682
Total expenses	169,476	248,212	573,007	744,980
Equity in net loss from unconsolidated joint ventures	(15,487)	(432)	(31,321)	(15,445)
Equity in net loss on sale of interest in unconsolidated joint venture/real estate	(1,280)	0	(5,438)	0
Purchase price and other fair value adjustments	208,810	0	209,527	0
Gain on sale of real estate, net	187,766	26,104	285,338	163,624
Depreciable real estate reserves and impairment	0	(6,627)	(5,696)	(6,627)
Net income	415,534	20,677	528,813	214,418
Net income attributable to noncontrolling interests:
Noncontrolling interests in other partnerships	915	(414)	2,454	(1,145)
Preferred units distributions	(1,823)	(1,864)	(5,492)	(6,883)
Net income (loss) attributable to SL Green/SLGOP	414,626	18,399	525,775	206,390
Perpetual preferred unit distributions	(3,738)	(3,738)	(11,213)	(11,213)
Net income attributable to SLGOP common unitholders	$ 410,888	$ 14,661	$ 514,562	$ 195,177
Basic earnings per unit (usd per share)		$ 0.19	$ 7.08	$ 2.51
Diluted earnings per unit (usd per share)	$ 5.75	$ 0.19	$ 7.04	$ 2.50
Basic weighted average common units outstanding (in shares)	70,674	74,972	72,299	77,496
Diluted weighted average common units and common unit equivalents outstanding (in shares)	71,487	75,414	73,087	77,937