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Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Unit Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Rollforward Analysis of Preferred Unit Activity
Redemption and conversion of common units	$ (9,216)		$ (29,817)
SL Green Operating Partnership
Rollforward Analysis of Preferred Unit Activity
Redemption and conversion of common units	(9,216)		(29,817)
SL Green Operating Partnership | Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	166,501	$ 177,943
Issuance of preferred units	0	0
Redemption and conversion of common units	(2,503)	(11,700)
Dividends paid on preferred units	(4,453)	(6,271)
Accrued dividends on preferred units	4,665	6,529
Balance at end of period	$ 164,210	$ 166,501	$ 177,943

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