Consolidated Balance Sheets (Partnership) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets
Debt and preferred equity investments, discount and deferred origination fees	$ 5	$ 14
Allowance for loan and lease losses, real estate	300	454
Deferred costs accumulated amortization	178,841	174,617
SLGOP partners' capital:
Land and land interests	1,848,531	1,699,215
Building and improvements	4,298,249	4,012,305
Building leasehold and improvements	1,465,411	1,448,112
Right-of-use assets - operating leases	909,377	864,430
Accumulated depreciation	2,321,290	2,306,377
Debt fund investments, at fair value	293,243	152,958
Real estate loans held by consolidated securitization vehicles, at fair value	1,027,164	1,023,877
Other assets	570,175	577,299
Real estate debt	2,491,849	2,146,049
Lease liabilities	108,515	108,183
Senior obligations of consolidated securitization vehicles, at fair value	1,027,164	1,023,877
Other liabilities	241,392	392,756
SL Green Operating Partnership
Assets
Debt and preferred equity investments, discount and deferred origination fees	5	14
Allowance for loan and lease losses, real estate	300	454
Deferred costs accumulated amortization	$ 178,841	$ 174,617
Liabilities
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	5,704	4,538
SLGOP partners' capital:
SL Green partner's capital, general partner common units outstanding (shares)	768	757
SL Green partners' capital, limited partner common units outstanding (shares)	70,356	70,402
Land and land interests	$ 1,848,531	$ 1,699,215
Building and improvements	4,298,249	4,012,305
Building leasehold and improvements	1,465,411	1,448,112
Right-of-use assets - operating leases	909,377	864,430
Accumulated depreciation	2,321,290	2,306,377
Debt fund investments, at fair value	293,243	152,958
Real estate loans held by consolidated securitization vehicles, at fair value	1,027,164	1,023,877
Other assets	570,175	577,299
Real estate debt	2,491,849	2,146,049
Lease liabilities	108,515	108,183
Senior obligations of consolidated securitization vehicles, at fair value	1,027,164	1,023,877
Other liabilities	241,392	392,756
Service Corporation
SLGOP partners' capital:
Land and land interests	369,900	185,200
Building and improvements	685,500	207,500
Building leasehold and improvements	0	0
Right-of-use assets - operating leases	0	0
Accumulated depreciation	8,000	6,300
Debt fund investments, at fair value	293,200	153,000
Real estate loans held by consolidated securitization vehicles, at fair value	1,027,200	1,023,900
Other assets	628,700	862,500
Real estate debt	856,100	328,600
Accrued interest payable	2,300	900
Lease liabilities	0	0
Senior obligations of consolidated securitization vehicles, at fair value	1,027,200	1,023,900
Other liabilities	$ 230,500	$ 287,500
Series I Preferred Stock | SL Green Operating Partnership
SLGOP partners' capital:
Preferred units, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred units, shares issued (in shares)	9,200	9,200
Preferred units, shares outstanding (in shares)	9,200	9,200