Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Rental revenue, net	$ 605,999	$ 683,335	$ 671,500
SUMMIT Operator revenue	133,214	118,260	89,048
Investment income	24,353	34,705	81,113
Interest income from real estate loans held by consolidated securitization vehicles	18,980	0	0
Other income	103,726	77,410	77,793
Total revenues	886,272	913,710	919,454
Expenses
Real estate taxes	128,187	143,757	138,228
Operating lease rent	24,423	27,292	26,943
SUMMIT Operator expenses	111,739	101,211	89,207
Interest expense, net of interest income	147,220	137,114	89,473
Amortization of deferred financing costs	6,619	7,837	7,817
SUMMIT Operator tax expense	730	9,201	2,647
Interest expense on senior obligations of consolidated securitization vehicles	14,634	0	0
Depreciation and amortization	207,443	247,810	216,167
Loan loss and other investment reserves, net of recoveries	0	6,890	0
Transaction related costs	401	1,099	409
Marketing, general and administrative	85,187	111,389	93,798
Total expenses	916,181	990,296	838,752
Equity in net loss from unconsolidated joint ventures	(179,695)	(76,509)	(57,958)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	208,144	(13,368)	(131)
Purchase price and other fair value adjustments	88,966	(17,260)	(8,118)
Gain (loss) on sale of real estate, net	3,025	(32,370)	(84,485)
Depreciable real estate reserves and impairments	(104,071)	(382,374)	(6,313)
Gain (loss) on early extinguishment of debt	43,762	(870)	0
Net income (loss)	30,222	(599,337)	(76,303)
Net loss attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(497)	37,465	5,794
Noncontrolling interests in other partnerships	928	4,568	(1,122)
Preferred units distributions	(8,643)	(7,255)	(6,443)
Net income (loss) attributable to SL Green	22,010	(564,559)	(78,074)
Perpetual preferred stock dividends	(14,950)	(14,950)	(14,950)
Net income (loss) attributable to SL Green common stockholders	$ 7,060	$ (579,509)	$ (93,024)
Basic earnings (loss) per share (in dollars per share)	$ 0.08	$ (9.12)	$ (1.49)
Diluted earnings (loss) per share (in dollars per share)	$ 0.08	$ (9.12)	$ (1.49)
Basic weighted average common shares outstanding (in shares)	65,062	63,809	63,917
Diluted weighted average common shares and common share equivalents outstanding (in shares)	65,688	67,972	67,929
Nonrelated party
Expenses
Operating expenses, including related party expenses of $7 in 2024, $5 in 2023 and $5,701 in 2022	$ 189,598	$ 196,696	$ 174,063