Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Rental revenue, net	$ 678,176	$ 804,423	$ 983,557
Investment income	80,340	120,163	195,590
Other income	85,475	128,158	59,848
Total revenues	843,991	1,052,744	1,238,995
Expenses
Operating expenses, including related party expenses of $12,377 in 2021, $12,643 in 2020 and $18,106 in 2019	167,153	183,200	234,676
Real estate taxes	152,835	176,315	190,764
Operating lease rent	26,554	29,043	33,188
Interest expense, net of interest income	70,891	116,679	190,521
Amortization of deferred financing costs	11,424	11,794	11,653
Depreciation and amortization	216,869	313,668	272,358
Loan loss and other investment reserves, net of recoveries	2,931	35,298	0
Transaction related costs	3,773	503	729
Marketing, general and administrative	94,912	91,826	100,875
Total expenses	747,342	958,326	1,034,764
Equity in net loss from unconsolidated joint ventures	(55,402)	(25,195)	(34,518)
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate	(32,757)	2,961	76,181
Purchase price and other fair value adjustment	210,070	187,522	69,389
Gain on sale of real estate, net	287,417	215,506	(16,749)
Depreciable real estate reserves and impairments	(23,794)	(60,454)	(7,047)
Loss on early extinguishment of debt	(1,551)	0	0
Net income	480,632	414,758	291,487
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(25,457)	(20,016)	(13,301)
Net loss (income) attributable to noncontrolling interests in other partnerships	1,884	(14,940)	3,159
Preferred unit distributions	(7,305)	(8,747)	(10,911)
Net income (loss) attributable to SL Green/SLGOP	449,754	371,055	270,434
Perpetual preferred stock dividends	(14,950)	(14,950)	(14,950)
Net income attributable to SL Green common stockholders	$ 434,804	$ 356,105	$ 255,484
Basic earnings per share (in dollars per share)	$ 6.57	$ 5.03	$ 3.29
Diluted earnings per share (in dollars per share)	$ 6.50	$ 5.01	$ 3.28
Basic weighted average common shares outstanding (in shares)	65,740	70,397	77,057
Diluted weighted average common shares and common share equivalents outstanding (in shares)	70,769	75,078	81,865