Organization and Basis of Presentation - Additional Information (Details) ft² in Millions	3 Months Ended
	Mar. 31, 2026 ft² building shares	Dec. 31, 2025
Organization
Number of shares to be received on redemption of one unit of limited partnership interests (shares) | shares	1
Office Building
Organization
Number of buildings | building	3
Managed Office Properties
Organization
Unaudited Approximate Square Feet | ft²	0.8
Operating Partnership | SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	7.63%	6.42%