Consolidated Statements of Equity - USD ($) $ in Thousands	Total	SL Green Operating Partnership	Common Stock	Common Stock SL Green Operating Partnership	Common Stock SL Green Operating Partnership Partners' Interest	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Income	Retained Deficit	Noncontrolling Interests	Noncontrolling Interests SL Green Operating Partnership	Series I Preferred Stock SL Green Operating Partnership	Series I Preferred Stock Series I Preferred Stock
Beginning balance at Dec. 31, 2022	$ 4,646,922		$ 656			$ 3,790,358	$ (128,655)	$ 49,604	$ 651,138	$ 61,889			$ 221,932
Beginning balance (in shares) at Dec. 31, 2022			64,380,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(395,115)								(392,450)	(2,665)
Other comprehensive income (loss)	8,165							8,165
Perpetual preferred stock dividends	(7,475)	$ (7,475)							(7,475)
DRSPP proceeds (in shares)			12,000		12,000
DRSPP proceeds	342	342			$ 342	342
Reallocation of noncontrolling interest in the Operating Partnership	(11,198)	(11,198)			$ (11,198)				(11,198)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)			(5,000)		(5,000)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	15,004	15,004			$ 15,004	15,004
Consolidation of joint venture interest	8,448	8,448								8,448	$ 8,448
Cash distributions to noncontrolling interests	(763)	(763)								(763)	(763)
Cash distributions declared	(104,497)								(104,497)
Ending balance at Jun. 30, 2023	4,159,833		$ 656			3,805,704	(128,655)	57,769	135,518	66,909			221,932
Ending balance (in shares) at Jun. 30, 2023			64,387,000
Beginning balance at Dec. 31, 2022	4,646,922		$ 656			3,790,358	(128,655)	49,604	651,138	61,889			221,932
Beginning balance (in shares) at Dec. 31, 2022			64,380,000
Ending balance at Dec. 31, 2023	3,855,925		$ 660			3,826,452	(128,655)	17,477	(151,551)	69,610			221,932
Ending balance (in shares) at Dec. 31, 2023			64,726,000
Beginning balance at Mar. 31, 2023	4,529,174		$ 656			3,798,101	(128,655)	19,428	549,024	68,688			221,932
Beginning balance (in shares) at Mar. 31, 2023			64,373,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(357,497)								(356,457)	(1,040)
Other comprehensive income (loss)	38,341							38,341
Perpetual preferred stock dividends	(3,737)	(3,737)							(3,737)
DRSPP proceeds (in shares)			7,000		7,000
DRSPP proceeds	158	158			$ 158	158
Reallocation of noncontrolling interest in the Operating Partnership	(1,051)	(1,051)			$ (1,051)				(1,051)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)			7,000		7,000
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	7,445	7,445			$ 7,445	7,445
Consolidation of joint venture interest	(112)	(112)								(112)	(112)
Cash distributions to noncontrolling interests	(627)	(627)								(627)	(627)
Cash distributions declared	(52,261)								(52,261)
Ending balance at Jun. 30, 2023	4,159,833		$ 656			3,805,704	(128,655)	57,769	135,518	66,909			221,932
Ending balance (in shares) at Jun. 30, 2023			64,387,000
Beginning balance at Dec. 31, 2023	3,855,925		$ 660			3,826,452	(128,655)	17,477	(151,551)	69,610			221,932
Beginning balance (in shares) at Dec. 31, 2023			64,726,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	15,291								18,456	(3,165)
Acquisition of subsidiary interest from noncontrolling interest	(5,674)	(5,674)								(5,674)	(5,674)
Other comprehensive income (loss)	22,894							22,894
Perpetual preferred stock dividends	(7,475)	(7,475)							(7,475)
DRSPP proceeds (in shares)			2,000		2,000
DRSPP proceeds	120	120			$ 120	120
Reallocation of noncontrolling interest in the Operating Partnership	(42,477)	(42,477)			$ (42,477)				(42,477)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)			86,000		86,000
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	10,179	10,179			$ 10,179	10,179
Contributions to consolidated joint venture interests	1,823	1,823								1,823	1,823
Consolidation of joint venture interest	6,678	6,678								6,678	6,678
Cash distributions to noncontrolling interests	(2,807)	(2,807)								(2,807)	(2,807)
Cash distributions declared	(96,716)								(96,716)
Ending balance at Jun. 30, 2024	3,757,761		$ 660			3,836,751	(128,655)	40,371	(279,763)	66,465			221,932
Ending balance (in shares) at Jun. 30, 2024			64,814,000	64,814,035								9,200,000
Beginning balance at Mar. 31, 2024	3,803,648		$ 660			3,831,130	(128,655)	40,151	(229,607)	68,037			221,932
Beginning balance (in shares) at Mar. 31, 2024			64,806,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(294)								1,577	(1,871)
Other comprehensive income (loss)	220							220
Perpetual preferred stock dividends	(3,737)	(3,737)							(3,737)
DRSPP proceeds (in shares)
DRSPP proceeds	43	43			43	43
Reallocation of noncontrolling interest in the Operating Partnership	364	364			$ 364				364
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)			8,000		8,000
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	5,578	5,578			$ 5,578	5,578
Consolidation of joint venture interest	1,823	1,823								1,823	1,823
Cash distributions to noncontrolling interests	(1,524)	$ (1,524)								(1,524)	$ (1,524)
Cash distributions declared	(48,360)								(48,360)
Ending balance at Jun. 30, 2024	$ 3,757,761		$ 660			$ 3,836,751	$ (128,655)	$ 40,371	$ (279,763)	$ 66,465			$ 221,932
Ending balance (in shares) at Jun. 30, 2024			64,814,000	64,814,035								9,200,000