Consolidated Statements of Cash Flows (Partnership) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Operating Activities
Net income (loss)	$ 18,389	$ (38,357)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	50,123	80,803
Equity in net (income) loss from unconsolidated joint ventures	(111,160)	7,412
Distributions of cumulative earnings from unconsolidated joint ventures	68	258
Equity in net (gain) loss on sale of interest in unconsolidated joint venture interest/real estate	(26,764)	79
Purchase price and other fair value adjustments	50,492	(239)
Depreciable real estate reserves and impairment	52,118	0
Loss on sale of real estate, net	0	1,651
Loan loss reserves and other investment reserves, net of recoveries	0	6,890	$ 6,890
Deferred rents receivable	(3,721)	(7,431)
Non-cash lease expense	5,003	5,261
Other non-cash adjustments	11,166	(3,271)
Changes in operating assets and liabilities:
Tenant and other receivables	(3,174)	(969)
Related party receivables	245	577
Deferred lease costs	(3,735)	(3,911)
Other assets	(12,644)	(11,394)
Accounts payable, accrued expenses, other liabilities and security deposits	(50,003)	4,656
Deferred revenue	3,017	2,450
Lease liability - operating leases	(4,097)	(2,116)
Net cash (used in) provided by operating activities	(24,677)	42,349
Investing Activities
Additions to land, buildings and improvements	(55,316)	(61,918)
Acquisition deposits and deferred purchase price	(12,817)	0
Investments in unconsolidated joint ventures	(23,830)	(22,985)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	71,545	41,812
Net proceeds from disposition of real estate/joint venture interest	26,420	0
Other investments	(2,770)	(17,700)
Origination of debt and preferred equity investments	(6,945)	(5,578)
Net cash used in investing activities	(3,713)	(66,369)
Financing Activities
Proceeds from mortgages and other loans payable	493	0
Repayments of mortgages and other loans payable	(1,501)	(1,473)
Proceeds from revolving credit facility, term loans and unsecured notes	130,000	143,000
Repayments of revolving credit facility, term loans and unsecured notes	(40,000)	(78,000)
Proceeds from stock options exercised and DRSPP issuance	77	184
Redemption of OP units	(18,608)	(5,220)
Distributions to noncontrolling interests in other partnerships	(1,283)	(136)
Contributions from noncontrolling interests in other partnerships	0	426
Distributions paid on common and preferred units	(54,142)	(57,373)
Deferred loan costs	(60)	(358)
Net cash provided by (used in) financing activities	11,367	(2,772)
Net decrease in cash, cash equivalents, and restricted cash	(17,023)	(26,792)
Cash, cash equivalents, and restricted cash at beginning of year	335,519	384,054	384,054
Cash, cash equivalents, and restricted cash at end of period	318,496	357,262	335,519
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Fair value adjustment to noncontrolling interest in the Operating Partnership	42,841	10,147
Consolidation of a subsidiary	6,678	0
Consolidation of mortgage loan payable	205,000	0
Acquisition of subsidiary interest from noncontrolling interest	5,674	0
Contribution to consolidated joint venture interest	0	8,134
Removal of fully depreciated commercial real estate properties	3,354	4,247
Share repurchase or redemption payable	5,012	0
Cash and cash equivalents	196,035	158,937	221,823
Restricted cash	122,461	198,325	113,696
Total cash, cash equivalents, and restricted cash	318,496	357,262	335,519
SL Green Operating Partnership
Operating Activities
Net income (loss)	18,389	(38,357)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	50,123	80,803
Equity in net (income) loss from unconsolidated joint ventures	(111,160)	7,412
Distributions of cumulative earnings from unconsolidated joint ventures	68	258
Equity in net (gain) loss on sale of interest in unconsolidated joint venture interest/real estate	(26,764)	79
Purchase price and other fair value adjustments	50,492	(239)
Depreciable real estate reserves and impairment	52,118	0
Loss on sale of real estate, net	0	1,651
Loan loss reserves and other investment reserves, net of recoveries	0	6,890
Deferred rents receivable	(3,721)	(7,431)
Non-cash lease expense	5,003	5,261
Other non-cash adjustments	11,166	(3,271)
Changes in operating assets and liabilities:
Tenant and other receivables	(3,174)	(969)
Related party receivables	245	577
Deferred lease costs	(3,735)	(3,911)
Other assets	(12,644)	(11,394)
Accounts payable, accrued expenses, other liabilities and security deposits	(50,003)	4,656
Deferred revenue	3,017	2,450
Lease liability - operating leases	(4,097)	(2,116)
Net cash (used in) provided by operating activities	(24,677)	42,349
Investing Activities
Additions to land, buildings and improvements	(55,316)	(61,918)
Acquisition deposits and deferred purchase price	(12,817)	0
Investments in unconsolidated joint ventures	(23,830)	(22,985)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	71,545	41,812
Net proceeds from disposition of real estate/joint venture interest	26,420	0
Other investments	(2,770)	(17,700)
Origination of debt and preferred equity investments	(6,945)	(5,578)
Net cash used in investing activities	(3,713)	(66,369)
Financing Activities
Proceeds from mortgages and other loans payable	493	0
Repayments of mortgages and other loans payable	(1,501)	(1,473)
Proceeds from revolving credit facility, term loans and unsecured notes	130,000	143,000
Repayments of revolving credit facility, term loans and unsecured notes	(40,000)	(78,000)
Proceeds from stock options exercised and DRSPP issuance	77	184
Redemption of OP units	(18,608)	(5,220)
Distributions to noncontrolling interests in other partnerships	(1,283)	(136)
Contributions from noncontrolling interests in other partnerships	0	426
Distributions paid on common and preferred units	(57,751)	(61,195)
Deferred loan costs	(60)	(358)
Net cash provided by (used in) financing activities	11,367	(2,772)
Net decrease in cash, cash equivalents, and restricted cash	(17,023)	(26,792)
Cash, cash equivalents, and restricted cash at beginning of year	335,519	384,054	384,054
Cash, cash equivalents, and restricted cash at end of period	318,496	357,262	335,519
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Fair value adjustment to noncontrolling interest in the Operating Partnership	42,841	10,147
Consolidation of a subsidiary	6,678	0
Acquisition of subsidiary interest from noncontrolling interest	5,674	0
Contribution to consolidated joint venture interest	0	8,134
Removal of fully depreciated commercial real estate properties	3,354	4,247
Share repurchase or redemption payable	5,012	0
Cash and cash equivalents	196,035	158,937	221,823
Restricted cash	122,461	198,325	113,696
Total cash, cash equivalents, and restricted cash	$ 318,496	$ 357,262	$ 335,519