SL Green Operating Partnership 10-K 14 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Feb. 13, 2025	Jun. 30, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2024
Document Transition Report	false
Entity File Number	1-13199
Entity Registrant Name	SL GREEN REALTY CORP
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	13-3956775
Entity Address, Address Line One	One Vanderbilt Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10017
City Area Code	212
Local Phone Number	594-2700
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction Flag	false
Entity Shell Company	false
Entity Public Float			$ 3.3
Entity Common Stock, Shares Outstanding		71,004,564
Documents Incorporated by Reference	Portions of the SL Green Realty Corp.'s Proxy Statement for its 2025 Annual Stockholders' Meeting to be filed within 120 days after the end of the Registrant's fiscal year are incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001040971
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock
Document Information [Line Items]
Trading Symbol	SLG
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NYSE
Preferred Stock
Document Information [Line Items]
Trading Symbol	SLG.PRI
Title of 12(b) Security	6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value
Security Exchange Name	NYSE
SL Green Operating Partnership
Document Information [Line Items]
Current Fiscal Year End Date	--12-31
Entity File Number	33-167793-02
Entity Registrant Name	SL GREEN OPERATING PARTNERSHIP, L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3960938
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		301,668
Entity Central Index Key	0001492869
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Auditor [Line Items]
Auditor Firm ID	34	42
Auditor Name	Deloitte & Touche LLP	Ernst & Young LLP
Auditor Location	New York, New York	New York, New York
SL Green Operating Partnership
Auditor [Line Items]
Auditor Firm ID	34	42
Auditor Name	Deloitte & Touche LLP	Ernst & Young LLP
Auditor Location	New York, New York	New York, New York

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Commercial real estate properties, at cost:
Land and land interests		$ 1,357,041	$ 1,092,671
Building and improvements		3,862,224	3,655,624
Building leasehold and improvements		1,388,476	1,354,569
Total commercial real estate properties, at cost		6,607,741	6,102,864
Less: accumulated depreciation		(2,126,081)	(1,968,004)
Total commercial real estate properties, net		4,481,660	4,134,860
Cash and cash equivalents		184,294	221,823
Restricted cash		147,344	113,696
Investments in marketable securities		22,812	9,591
Tenant and other receivables		44,055	33,270
Related party receivables		26,865	12,168
Deferred rents receivable		266,428	264,653
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,618 and $1,630 and allowances of $13,520 and $13,520 in 2024 and 2023, respectively		303,726	346,745
Investments in unconsolidated joint ventures		2,690,138	2,983,313
Deferred costs, net		117,132	111,463
Right of use asset - operating leases		865,639	885,929
Real estate loans held by consolidated securitization vehicles (includes $584,134 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)		709,095	0
Other assets		610,911	413,670
Total assets	[1]	10,470,099	9,531,181
Liabilities
Mortgages and other loans payable, net		1,944,635	1,491,319
Revolving credit facility, net		316,240	554,752
Unsecured term loans, net		1,146,010	1,244,881
Unsecured notes, net		99,897	99,795
Accrued interest payable		16,527	17,930
Senior obligations of consolidated securitization vehicles (includes $567,487 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)		590,131	0
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)		414,153	471,401
Accounts payable and accrued expenses		122,674	153,164
Deferred revenue		164,887	134,053
Lease liability - financing leases		106,853	105,531
Lease liability - operating leases		810,989	827,692
Dividend and distributions payable		21,816	20,280
Security deposits		60,331	49,906
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	5,915,143	5,270,704
Commitments and contingencies (See Note 20)
Noncontrolling interests in Operating Partnership		288,941	238,051
Preferred units and redeemable equity		196,064	166,501
SL Green stockholders' equity:
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2024 and 2023		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 71,097 and 65,786 issued and outstanding at December 31, 2024 and 2023, respectively (including 0 and 1,060 shares held in treasury at December 31, 2024 and 2023, respectively)		711	660
Additional paid-in-capital		4,159,562	3,826,452
Treasury stock at cost		0	(128,655)
Accumulated other comprehensive income		18,196	17,477
Retained deficit		(449,101)	(151,551)
Total SL Green stockholders' equity		3,951,300	3,786,315
Noncontrolling interests in other partnerships		118,651	69,610
Total equity		4,069,951	3,855,925
Total liabilities and equity/capital		$ 10,470,099	$ 9,531,181
[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $236.7 million and $41.2 million of land, $159.1 million and $40.5 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $4.1 million and $5.4 million of accumulated depreciation, 709.1 million and — million of real estate loans held by consolidated securitization vehicles, $830.3 million and $676.9 million of other assets included in other line items, $357.9 million and $50.0 million of real estate debt, net, $1.1 million and $0.9 million of accrued interest payable, $— million and $— million of lease liabilities, 590.1 million and — million of senior obligations of consolidated securitization vehicles and $324.8 million and $306.5 million of other liabilities included in other line items as of December 31, 2024 and December 31, 2023, respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets
Debt and preferred equity investments, net of discounts and deferred origination fees	$ 1,618	$ 1,630
Allowance for loan and lease losses	13,520	$ 13,520
Real estate loans held by consolidated securitization vehicles	584,134
Liabilities
Senior obligations of consolidated securitization vehicles	567,487
Other liabilities	$ 251,096
Equity
Preferred stock, par (in dollars per share)	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Common stock, shares issued (in shares)	71,097,000	65,786,000
Common stock, shares outstanding (in shares)	71,097,000	65,786,000
Treasury stock, shares (in shares)	0	1,060,000
Land and land interests	$ 1,357,041	$ 1,092,671
Building and improvements	3,862,224	3,655,624
Building leasehold and improvements	1,388,476	1,354,569
Right of use asset - operating leases	865,639	885,929
Real Estate Investment Property, Accumulated Depreciation	2,126,081	1,968,004
Real estate loans held by consolidated securitization vehicles (includes $584,134 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)	709,095	0
Other assets	610,911	413,670
Mortgages and other loans payable, net	1,944,635	1,491,319
Lease liabilities	106,853	105,531
Senior obligations of consolidated securitization vehicles (includes $567,487 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)	590,131	0
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)	414,153	471,401
Service Corporation
Equity
Land and land interests	236,700	41,200
Building and improvements	159,100	40,500
Building leasehold and improvements	0	0
Right of use asset - operating leases	0	0
Real Estate Investment Property, Accumulated Depreciation	4,100	5,400
Real estate loans held by consolidated securitization vehicles (includes $584,134 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)	709,100	0
Other assets	830,300	676,900
Mortgages and other loans payable, net	357,900	50,000
Accrued interest payable	1,100	900
Lease liabilities	0	0
Senior obligations of consolidated securitization vehicles (includes $567,487 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)	590,100	0
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)	324,800	306,500
SL Green Operating Partnership
Assets
Debt and preferred equity investments, net of discounts and deferred origination fees	1,618	1,630
Allowance for loan and lease losses	13,520	13,520
Real estate loans held by consolidated securitization vehicles	584,134	0
Liabilities
Senior obligations of consolidated securitization vehicles	567,487	0
Other liabilities	251,096	259,392
Equity
Land and land interests	1,357,041	1,092,671
Building and improvements	3,862,224	3,655,624
Building leasehold and improvements	1,388,476	1,354,569
Right of use asset - operating leases	865,639	885,929
Real Estate Investment Property, Accumulated Depreciation	2,126,081	1,968,004
Real estate loans held by consolidated securitization vehicles (includes $584,134 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)	709,095	0
Other assets	610,911	413,670
Mortgages and other loans payable, net	1,944,635	1,491,319
Lease liabilities	106,853	105,531
Senior obligations of consolidated securitization vehicles (includes $567,487 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)	590,131	0
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)	$ 414,153	$ 471,401
Series I Preferred Stock
Equity
Preferred stock, par (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25	$ 25
Preferred stock, shares issued (in shares)	9,200,000	9,200,000
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Rental revenue, net	$ 605,999	$ 683,335	$ 671,500
SUMMIT Operator revenue	133,214	118,260	89,048
Investment income	24,353	34,705	81,113
Interest income from real estate loans held by consolidated securitization vehicles	18,980	0	0
Other income	103,726	77,410	77,793
Total revenues	886,272	913,710	919,454
Expenses
Real estate taxes	128,187	143,757	138,228
Operating lease rent	24,423	27,292	26,943
SUMMIT Operator expenses	111,739	101,211	89,207
Interest expense, net of interest income	147,220	137,114	89,473
Amortization of deferred financing costs	6,619	7,837	7,817
SUMMIT Operator tax expense	730	9,201	2,647
Interest expense on senior obligations of consolidated securitization vehicles	14,634	0	0
Depreciation and amortization	207,443	247,810	216,167
Loan loss and other investment reserves, net of recoveries	0	6,890	0
Transaction related costs	401	1,099	409
Marketing, general and administrative	85,187	111,389	93,798
Total expenses	916,181	990,296	838,752
Equity in net loss from unconsolidated joint ventures	(179,695)	(76,509)	(57,958)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	208,144	(13,368)	(131)
Purchase price and other fair value adjustments	88,966	(17,260)	(8,118)
Gain (loss) on sale of real estate, net	3,025	(32,370)	(84,485)
Depreciable real estate reserves and impairments	(104,071)	(382,374)	(6,313)
Gain (loss) on early extinguishment of debt	43,762	(870)	0
Net income (loss)	30,222	(599,337)	(76,303)
Net loss attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(497)	37,465	5,794
Noncontrolling interests in other partnerships	928	4,568	(1,122)
Preferred units distributions	(8,643)	(7,255)	(6,443)
Net income (loss) attributable to SL Green	22,010	(564,559)	(78,074)
Perpetual preferred stock dividends	(14,950)	(14,950)	(14,950)
Net income (loss) attributable to SL Green common stockholders	$ 7,060	$ (579,509)	$ (93,024)
Basic earnings (loss) per share (in dollars per share)	$ 0.08	$ (9.12)	$ (1.49)
Diluted earnings (loss) per share (in dollars per share)	$ 0.08	$ (9.12)	$ (1.49)
Basic weighted average common shares outstanding (in shares)	65,062	63,809	63,917
Diluted weighted average common shares and common share equivalents outstanding (in shares)	65,688	67,972	67,929
Nonrelated party
Expenses
Operating expenses, including related party expenses of $7 in 2024, $5 in 2023 and $5,701 in 2022	$ 189,598	$ 196,696	$ 174,063

Consolidated Statements of Op_2

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related party
Payments made for services	$ 7	$ 5	$ 5,701

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 30,222	$ (599,337)	$ (76,303)
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	318	(32,437)	103,629
Increase (decrease) in unrealized value of marketable securities	552	(1,650)	(1,440)
Other comprehensive income (loss)	870	(34,087)	102,189
Comprehensive income (loss)	31,092	(633,424)	25,886
Net (income) loss attributable to noncontrolling interests and preferred units distributions	(8,212)	34,778	(1,771)
Other comprehensive (income) loss attributable to noncontrolling interests	(151)	1,960	(5,827)
Comprehensive income attributable to SL Green/SLGOP	$ 22,729	$ (596,686)	$ 18,288

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid- In-Capital	Treasury Stock	Accumulated Other Comprehensive Income	Retained Earnings (Deficit)	Noncontrolling Interests	Series I Preferred Stock Preferred Stock
Beginning balance at Dec. 31, 2021	$ 4,778,253	$ 672	$ 3,739,409	$ (126,160)	$ (46,758)	$ 975,781	$ 13,377	$ 221,932
Beginning balance (in shares) at Dec. 31, 2021		64,105
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(76,952)					(78,074)	1,122
Acquisition of subsidiary interest from noncontrolling interest	(29,817)		(29,742)				(75)
Other comprehensive income (loss)	96,362				96,362
Perpetual preferred stock dividends	(14,950)					(14,950)
DRSPP proceeds (in shares)		11
DRSPP proceeds	525		525
Measurement adjustment for redeemable noncontrolling interest	39,974					39,974
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		274
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	32,034	$ 4	32,030
Repurchases of common stock (in shares)		(1,971)
Repurchases of common stock	(151,197)	$ (20)	(114,979)			(36,198)
Contributions to consolidated joint venture interests	52,164						52,164
Cash distributions to noncontrolling interests	(4,699)						(4,699)
Issuance of special dividend paid in stock (in shares)		1,961
Issuance of special dividend paid in stock	160,620		163,115	(2,495)
Cash distributions declared	(235,395)					(235,395)
Ending balance at Dec. 31, 2022	4,646,922	$ 656	3,790,358	(128,655)	49,604	651,138	61,889	221,932
Ending balance (in shares) at Dec. 31, 2022		64,380
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(569,127)					(564,559)	(4,568)
Other comprehensive income (loss)	(32,127)				(32,127)
Perpetual preferred stock dividends	(14,950)					(14,950)
DRSPP proceeds (in shares)		17
DRSPP proceeds	525		525
Measurement adjustment for redeemable noncontrolling interest	(15,486)					(15,486)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		329
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	35,573	$ 4	35,569
Contributions to consolidated joint venture interests	15,066						15,066
Cash distributions to noncontrolling interests	(2,777)						(2,777)
Cash distributions declared	(207,694)					(207,694)
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
Increase (Decrease) in Stockholders' Equity
Net income (loss)	21,082					22,010	(928)
Acquisition of subsidiary interest from noncontrolling interest	(9,216)		(4,130)				(5,086)
Other comprehensive income (loss)	719				719
Perpetual preferred stock dividends	(14,950)					(14,950)
DRSPP proceeds (in shares)		729
DRSPP proceeds	52,308	$ 7	52,301
Conversion of units in the Operating Partnership to common stock (in shares)		124
Measurement adjustment for redeemable noncontrolling interest	(107,631)					(107,631)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)		455
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	26,848	$ 4	26,844
Proceeds from issuance of common stock (in shares)		5,063
Proceeds from issuance of common stock	386,790	$ 51	386,739
Repurchases of common stock (in shares)
Repurchases of common stock	0	$ (11)	(128,644)	128,655
Contributions to consolidated joint venture interests	6,656						6,656
Consolidation of partially owned entity	59,452						59,452
Cash distributions to noncontrolling interests	(11,053)						(11,053)
Cash distributions declared	(196,979)					(196,979)
Ending balance at Dec. 31, 2024	$ 4,069,951	$ 711	$ 4,159,562	$ 0	$ 18,196	$ (449,101)	$ 118,651	$ 221,932
Ending balance (in shares) at Dec. 31, 2024		71,097

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	3 Months Ended			12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.2575	$ 0.2500	$ 0.2708	$ 3.0075	$ 3.2288	$ 3.6896

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net income (loss)	$ 30,222	$ (599,337)	$ (76,303)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	214,062	255,647	223,984
Equity in net loss from unconsolidated joint ventures	179,695	76,509	57,958
Distributions of cumulative earnings from unconsolidated joint ventures	12,992	9,897	780
Equity in net (gain) loss on sale of interest in unconsolidated joint venture/real estate	(208,144)	13,368	131
Purchase price and other fair value adjustments	(88,966)	17,260	8,118
Depreciable real estate reserves and impairments	104,071	382,374	6,313
(Gain) loss on sale of real estate, net	(3,025)	32,370	84,485
Loan loss and other investment reserves, net of recoveries	0	6,890	0
(Gain) loss on early extinguishment of debt	(43,762)	870	0
Deferred rents receivable	(1,535)	(17,903)	(5,749)
Non-cash lease expense	20,290	20,435	22,403
Other non-cash adjustments	46,219	28,174	(5,676)
Changes in operating assets and liabilities:
Tenant and other receivables	(11,804)	(1,725)	14,370
Related party receivables	(11,414)	15,788	6,666
Deferred lease costs	(29,271)	(17,427)	(21,792)
Other assets	15,968	(1,922)	(28,204)
Accounts payable, accrued expenses, other liabilities and security deposits	(74,501)	11,974	(30,839)
Deferred revenue	(4,799)	8,057	18,332
Lease liability - operating leases	(16,703)	(11,796)	1,111
Net cash provided by operating activities	129,595	229,503	276,088
Investing Activities
Acquisitions of real estate property	0	0	(64,491)
Additions to land, buildings and improvements	(211,869)	(259,663)	(300,770)
Acquisition deposits and deferred purchase price	23,050	0	0
Investments in unconsolidated joint ventures	(451,233)	(184,481)	(184,518)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	161,474	140,569	141,742
Net proceeds from disposition of real estate/joint venture interest	729,025	557,611	626,364
Cash and restricted cash assumed from acquisition and consolidation of real estate investment	19,017	0	60,494
Proceeds from sale or redemption of marketable securities	0	0	15,626
Investments in marketable securities	(12,368)	0	0
Investments in real estate loans held by consolidated securitization vehicles	(117,894)	0	0
Other investments	(21,535)	(17,334)	1,432
Origination of debt and preferred equity investments	(16,310)	(65,357)	(51,367)
Repayments or redemption of debt and preferred equity investments	63,496	0	181,293
Net cash provided by investing activities	118,753	171,345	425,805
Financing Activities
Proceeds from mortgages and other loans payable	4,450	0	381,980
Repayments of mortgages and other loans payable	(68,977)	(25,826)	(292,364)
Proceeds from revolving credit facility, term loans and senior unsecured notes	1,170,000	538,000	1,524,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(1,510,000)	(828,000)	(1,864,000)
Proceeds from stock options exercised and DRSPP issuance	52,308	525	525
Proceeds from issuance of common stock	386,790	0	0
Repurchase of common stock	0	0	(151,197)
Redemption of preferred stock	(2,503)	(11,700)	(17,967)
Redemption of OP units	(38,177)	(9,076)	(40,901)
Distributions to noncontrolling interests in other partnerships	(11,053)	(2,777)	(4,699)
Contributions from noncontrolling interests in other partnerships	6,584	6,932	52,164
Acquisition of subsidiary interest from noncontrolling interest	(7,289)	0	(29,817)
Distributions to noncontrolling interests in the Operating Partnership	(13,915)	(14,779)	(16,272)
Dividends paid on common and preferred stock	(218,823)	(230,931)	(262,136)
Other obligation related to secured borrowing	0	129,656	77,874
Tax withholdings related to restricted share awards	(182)	0	(3,915)
Deferred loan costs	(1,442)	(1,407)	(8,098)
Net cash used in financing activities	(252,229)	(449,383)	(654,823)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(3,881)	(48,535)	47,070
Cash, cash equivalents, and restricted cash at beginning of year	335,519	384,054	336,984
Cash, cash equivalents, and restricted cash at end of period	331,638	335,519	384,054
Supplemental cash flow disclosures:
Interest paid	200,752	229,119	169,519
Income taxes paid	9,001	7,815	5,358
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Exchange of preferred equity investment for real estate or equity in joint venture	0	0	190,652
Exchange of debt investment for real estate or equity in joint venture	0	349,946	193,995
Assumption of mortgage and mezzanine loans	0	0	1,712,750
Issuance of special dividend paid in stock	0	0	160,620
Tenant improvements and capital expenditures payable	0	0	18,518
Acquisition of subsidiary interest from noncontrolling interest	1,927	0	0
Measurement adjustment for redeemable noncontrolling interest	107,632	15,486	39,974
Consolidation of a subsidiary	50,377	0	0
Investment in joint venture	10,639	0	47,135
Deconsolidation of a subsidiary	0	101,351	0
Deconsolidation of subsidiary debt	0	1,712,750	0
Debt and preferred equity investments	1,133	0	302
Extinguishment of debt	46,835	0	0
Removal of fully depreciated commercial real estate properties	6,903	16,313	30,359
Contribution to consolidated joint venture by noncontrolling interest	72	8,134	0
Share repurchase or redemption payable	9,514	9,513	0
Recognition of right of use assets and related lease liabilities	0	0	57,938
Consolidation of securitization vehicle assets	600,521	0	0
Consolidation of securitization vehicle liabilities	600,521	0	0
Cash and cash equivalents	184,294	221,823	203,273
Restricted cash	147,344	113,696	180,781
Total cash, cash equivalents, and restricted cash	$ 331,638	$ 335,519	$ 384,054

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - $ / shares	3 Months Ended			12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.2575	$ 0.2500	$ 0.2708	$ 3.0075	$ 3.2288	$ 3.6896

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Partnership) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Commercial real estate properties, at cost:
Land and land interests		$ 1,357,041	$ 1,092,671
Building and improvements		3,862,224	3,655,624
Building leasehold and improvements		1,388,476	1,354,569
Right of use asset - operating leases		865,639	885,929
Total commercial real estate properties, at cost		6,607,741	6,102,864
Less: accumulated depreciation		(2,126,081)	(1,968,004)
Total commercial real estate properties, net		4,481,660	4,134,860
Cash and cash equivalents		184,294	221,823
Restricted cash		147,344	113,696
Investments in marketable securities		22,812	9,591
Tenant and other receivables		44,055	33,270
Related party receivables		26,865	12,168
Deferred rents receivable		266,428	264,653
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,618 and $1,630 and allowances of $13,520 and $13,520 in 2024 and 2023, respectively		303,726	346,745
Investments in unconsolidated joint ventures		2,690,138	2,983,313
Deferred costs, net		117,132	111,463
Right of use asset - operating leases		865,639	885,929
Real estate loans held by consolidated securitization vehicles (includes $584,134 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)		709,095	0
Other assets		610,911	413,670
Total assets	[1]	10,470,099	9,531,181
Liabilities
Mortgages and other loans payable, net		1,944,635	1,491,319
Revolving credit facility, net		316,240	554,752
Unsecured term loans, net		1,146,010	1,244,881
Unsecured notes, net		99,897	99,795
Accrued interest payable		16,527	17,930
Senior obligations of consolidated securitization vehicles (includes $567,487 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)		590,131	0
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)		414,153	471,401
Accounts payable and accrued expenses		122,674	153,164
Deferred revenue		164,887	134,053
Lease liability - financing leases		106,853	105,531
Lease liability - operating leases		810,989	827,692
Dividend and distributions payable		21,816	20,280
Security deposits		60,331	49,906
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	5,915,143	5,270,704
Commitments and contingencies (See Note 20)
Preferred units and redeemable equity		196,064	166,501
SL Green stockholders equity:
Accumulated other comprehensive income		18,196	17,477
Total liabilities and equity/capital		10,470,099	9,531,181
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		1,357,041	1,092,671
Building and improvements		3,862,224	3,655,624
Building leasehold and improvements		1,388,476	1,354,569
Right of use asset - operating leases		865,639	885,929
Total commercial real estate properties, at cost		6,607,741	6,102,864
Less: accumulated depreciation		(2,126,081)	(1,968,004)
Total commercial real estate properties, net		4,481,660	4,134,860
Cash and cash equivalents		184,294	221,823
Restricted cash		147,344	113,696
Investments in marketable securities		22,812	9,591
Tenant and other receivables		44,055	33,270
Related party receivables		26,865	12,168
Deferred rents receivable		266,428	264,653
Debt and preferred equity investments, net of discounts and deferred origination fees of $1,618 and $1,630 and allowances of $13,520 and $13,520 in 2024 and 2023, respectively		303,726	346,745
Investments in unconsolidated joint ventures		2,690,138	2,983,313
Deferred costs, net		117,132	111,463
Right of use asset - operating leases		865,639	885,929
Real estate loans held by consolidated securitization vehicles (includes $584,134 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)		709,095	0
Other assets		610,911	413,670
Total assets	[2]	10,470,099	9,531,181
Liabilities
Mortgages and other loans payable, net		1,944,635	1,491,319
Revolving credit facility, net		316,240	554,752
Unsecured term loans, net		1,146,010	1,244,881
Unsecured notes, net		99,897	99,795
Accrued interest payable		16,527	17,930
Senior obligations of consolidated securitization vehicles (includes $567,487 and $— at fair value as of December 31, 2024 and December 31, 2023, respectively)		590,131	0
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)		414,153	471,401
Accounts payable and accrued expenses		122,674	153,164
Deferred revenue		164,887	134,053
Lease liability - financing leases		106,853	105,531
Lease liability - operating leases		810,989	827,692
Dividend and distributions payable		21,816	20,280
Security deposits		60,331	49,906
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[2]	5,915,143	5,270,704
Commitments and contingencies (See Note 20)
Limited partner interests in SLGOP (4,510 and 3,949 limited partner common units outstanding at December 31, 2024 and 2023, respectively)		288,941	238,051
Preferred units and redeemable equity		196,064	166,501
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2024 and 2023		221,932	221,932
SL Green partners' capital (756 and 687 general partner common units, and 70,341 and 64,039 limited partner common units outstanding at December 31, 2024 and 2023, respectively)		3,711,172	3,546,906
Accumulated other comprehensive income		18,196	17,477
Total SLGOP partners' capital		3,951,300	3,786,315
Noncontrolling interests in other partnerships		118,651	69,610
Total capital		4,069,951	3,855,925
Total liabilities and equity/capital		$ 10,470,099	$ 9,531,181
[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $236.7 million and $41.2 million of land, $159.1 million and $40.5 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $4.1 million and $5.4 million of accumulated depreciation, 709.1 million and — million of real estate loans held by consolidated securitization vehicles, $830.3 million and $676.9 million of other assets included in other line items, $357.9 million and $50.0 million of real estate debt, net, $1.1 million and $0.9 million of accrued interest payable, $— million and $— million of lease liabilities, 590.1 million and — million of senior obligations of consolidated securitization vehicles and $324.8 million and $306.5 million of other liabilities included in other line items as of December 31, 2024 and December 31, 2023, respectively. (1) The Operating Partnership's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $236.7 million and $41.2 million of land, $159.1 million and $40.5 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $4.1 million and $5.4 million of accumulated depreciation, 709.1 million and — million of real estate loans held by consolidated securitization vehicles, $830.3 million and $676.9 million of other assets included in other line items, $357.9 million and $50.0 million of real estate debt, net, $1.1 million and $0.9 million of accrued interest payable, $— million and $— million of lease liabilities, 590.1 million and — million of senior obligations of consolidated securitization vehicles and $324.8 million and $306.5 million of other liabilities included in other line items as of December 31, 2024 and December 31, 2023, respectively.

Consolidated Balance Sheets (_3

Consolidated Balance Sheets (Partnership) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt and preferred equity investments, net of discounts and deferred origination fees	$ 1,618	$ 1,630
Allowance for loan and lease losses	13,520	13,520
Land	1,357,041	1,092,671
Building and improvements	3,862,224	3,655,624
Building leasehold and improvements	1,388,476	1,354,569
Right of use asset - operating leases	865,639	885,929
Accumulated depreciation	2,126,081	1,968,004
Other assets	610,911	413,670
Real estate debt	1,944,635	1,491,319
Lease liabilities	106,853	105,531
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)	414,153	471,401
SL Green Operating Partnership
Debt and preferred equity investments, net of discounts and deferred origination fees	1,618	1,630
Allowance for loan and lease losses	$ 13,520	$ 13,520
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	4,510,000	3,949,000
SL Green partner's capital, general partner common units outstanding (shares)	756,000	687,000
SL Green partners' capital, limited partner common units outstanding (shares)	70,341,000	64,039,000
Land	$ 1,357,041	$ 1,092,671
Building and improvements	3,862,224	3,655,624
Building leasehold and improvements	1,388,476	1,354,569
Right of use asset - operating leases	865,639	885,929
Accumulated depreciation	2,126,081	1,968,004
Other assets	610,911	413,670
Real estate debt	1,944,635	1,491,319
Lease liabilities	106,853	105,531
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)	414,153	471,401
Service Corporation
Land	236,700	41,200
Building and improvements	159,100	40,500
Building leasehold and improvements	0	0
Right of use asset - operating leases	0	0
Accumulated depreciation	4,100	5,400
Other assets	830,300	676,900
Real estate debt	357,900	50,000
Accrued interest payable	1,100	900
Lease liabilities	0	0
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)	$ 324,800	$ 306,500
Series I Preferred Stock | SL Green Operating Partnership
Preferred units, liquidation preference (in dollars per share)	$ 25	$ 25
Preferred units, shares issued (in shares)	9,200,000	9,200,000
Preferred units, shares outstanding (in shares)	9,200,000	9,200,000

Consolidated Statements of Op_3

Consolidated Statements of Operations (Partnership) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues
Rental revenue, net	$ 605,999	$ 683,335	$ 671,500
SUMMIT Operator revenue	133,214	118,260	89,048
Investment income	24,353	34,705	81,113
Interest income from real estate loans held by consolidated securitization vehicles	18,980	0	0
Other income	103,726	77,410	77,793
Total revenues	886,272	913,710	919,454
Expenses
Real estate taxes	128,187	143,757	138,228
Operating lease rent	24,423	27,292	26,943
SUMMIT Operator expenses	111,739	101,211	89,207
Interest expense, net of interest income	147,220	137,114	89,473
Amortization of deferred financing costs	6,619	7,837	7,817
SUMMIT Operator tax expense	730	9,201	2,647
Interest expense on senior obligations of consolidated securitization vehicles	14,634	0	0
Depreciation and amortization	207,443	247,810	216,167
Loan loss and other investment reserves, net of recoveries	0	6,890	0
Transaction related costs	401	1,099	409
Marketing, general and administrative	85,187	111,389	93,798
Total expenses	916,181	990,296	838,752
Equity in net loss from unconsolidated joint ventures	(179,695)	(76,509)	(57,958)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	208,144	(13,368)	(131)
Purchase price and other fair value adjustments	88,966	(17,260)	(8,118)
Gain (loss) on sale of real estate, net	3,025	(32,370)	(84,485)
Depreciable real estate reserves and impairments	(104,071)	(382,374)	(6,313)
Gain (loss) on early extinguishment of debt	43,762	(870)	0
Net income (loss)	30,222	(599,337)	(76,303)
Net Loss Attributable to Noncontrolling Interest
Noncontrolling interests in other partnerships	928	4,568	(1,122)
Preferred units distributions	(8,643)	(7,255)	(6,443)
Net income (loss) attributable to SL Green	22,010	(564,559)	(78,074)
Perpetual preferred unit dividends	(14,950)	(14,950)	(14,950)
Related party
Expenses
Operating expenses, including related party expenses of $7 in 2024, $5 in 2023 and $5,701 in 2022	7	5	5,701
SL Green Operating Partnership
Revenues
Rental revenue, net	605,999	683,335	671,500
SUMMIT Operator revenue	133,214	118,260	89,048
Investment income	24,353	34,705	81,113
Other income	103,726	77,410	77,793
Total revenues	886,272	913,710	919,454
Expenses
Operating expenses, including related party expenses of $7 in 2024, $5 in 2023 and $5,701 in 2022	189,598	196,696	174,063
Real estate taxes	128,187	143,757	138,228
Operating lease rent	24,423	27,292	26,943
SUMMIT Operator expenses	111,739	101,211	89,207
Interest expense, net of interest income	147,220	137,114	89,473
Amortization of deferred financing costs	6,619	7,837	7,817
SUMMIT Operator tax expense	730	9,201	2,647
Depreciation and amortization	207,443	247,810	216,167
Loan loss and other investment reserves, net of recoveries	0	6,890	0
Transaction related costs	401	1,099	409
Marketing, general and administrative	85,187	111,389	93,798
Total expenses	916,181	990,296	838,752
Equity in net loss from unconsolidated joint ventures	(179,695)	(76,509)	(57,958)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	208,144	(13,368)	(131)
Purchase price and other fair value adjustments	88,966	(17,260)	(8,118)
Gain (loss) on sale of real estate, net	3,025	(32,370)	(84,485)
Depreciable real estate reserves and impairments	(104,071)	(382,374)	(6,313)
Gain (loss) on early extinguishment of debt	43,762	(870)	0
Net income (loss)	30,222	(599,337)	(76,303)
Net Loss Attributable to Noncontrolling Interest
Noncontrolling interests in other partnerships	928	4,568	(1,122)
Preferred units distributions	(8,643)	(7,255)	(6,443)
Net income (loss) attributable to SL Green	22,507	(602,024)	(83,868)
Perpetual preferred unit dividends	(14,950)	(14,950)	(14,950)
Net income (loss) attributable to SLGOP common unitholders	$ 7,557	$ (616,974)	$ (98,818)
Basic earnings (loss) per unit (in dollars per share)	$ 0.04	$ (9.12)	$ (1.49)
Diluted earnings (loss) per unit (in dollars per share)	$ 0.04	$ (9.12)	$ (1.49)
Basic weighted average common units outstanding (in shares)	68,736	67,972	67,929
Diluted weighted average common units and common unit equivalents outstanding (in shares)	69,605	67,972	67,929
SL Green Operating Partnership | Related party
Expenses
Operating expenses, including related party expenses of $7 in 2024, $5 in 2023 and $5,701 in 2022	$ 7	$ 5	$ 5,701

Consolidated Statements of Op_4

Consolidated Statements of Operations (Partnership) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SL Green Operating Partnership
Payments made for services	$ 189,598	$ 196,696	$ 174,063

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Partnership) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net income (loss)	$ 30,222	$ (599,337)	$ (76,303)
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	318	(32,437)	103,629
Increase (decrease) in unrealized value of marketable securities	552	(1,650)	(1,440)
Other comprehensive income (loss)	870	(34,087)	102,189
Comprehensive income (loss)	31,092	(633,424)	25,886
Net loss attributable to noncontrolling interests	8,212	(34,778)	1,771
Other comprehensive (income) loss attributable to noncontrolling interests	(151)	1,960	(5,827)
Comprehensive income attributable to SL Green/SLGOP	22,729	(596,686)	18,288
SL Green Operating Partnership
Net income (loss)	30,222	(599,337)	(76,303)
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	318	(32,437)	103,629
Increase (decrease) in unrealized value of marketable securities	552	(1,650)	(1,440)
Other comprehensive income (loss)	870	(34,087)	102,189
Comprehensive income (loss)	31,092	(633,424)	25,886
Other comprehensive (income) loss attributable to noncontrolling interests	(151)	1,960	(5,827)
Comprehensive income attributable to SL Green/SLGOP	$ 31,869	$ (626,896)	$ 18,937

Consolidated Statements of Capi

Consolidated Statements of Capital - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest	$ (9,216)		$ (29,817)
DRSPP proceeds	52,308	$ 525	525
Measurement adjustment for redeemable noncontrolling interest	(107,631)	(15,486)	39,974
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	26,848	35,573	32,034
Proceeds from issuance of common stock	386,790
Repurchases of common units	0		(151,197)
Contributions to consolidated joint venture interests	6,656	15,066	52,164
Consolidation of partially owned entity	59,452
Cash distributions to noncontrolling interests	$ (11,053)	$ (2,777)	$ (4,699)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in units)	729	17	11
DRSPP proceeds	$ 7
Conversion of common units (in units)	124
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in units)	455	329	274
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 4	$ 4	$ 4
Proceeds from issuance of common stock (in shares)	5,063
Proceeds from issuance of common stock	$ 51
Repurchases of common units (in units)			(1,971)
Repurchases of common units	$ (11)		$ (20)
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest	(5,086)		(75)
Contributions to consolidated joint venture interests	6,656	15,066	52,164
Consolidation of partially owned entity	59,452
Cash distributions to noncontrolling interests	(11,053)	(2,777)	(4,699)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning balance	3,855,925	4,646,922	4,778,253
Net income (loss)	21,082	(569,127)	(76,952)
Acquisition of subsidiary interest from noncontrolling interest	(9,216)		(29,817)
Other comprehensive income (loss)	719	(32,127)	96,362
Perpetual preferred unit dividends	(14,950)	(14,950)	(14,950)
DRSPP proceeds	52,308	525	525
Measurement adjustment for redeemable noncontrolling interest	(107,631)	(15,486)	39,974
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	26,848	35,573	32,034
Proceeds from issuance of common stock	386,790
Repurchases of common units			(151,197)
Contributions to consolidated joint venture interests	6,656	15,066	52,164
Consolidation of partially owned entity	59,452
Cash distributions to noncontrolling interests	(11,053)	(2,777)	(4,699)
Issuance of special distribution paid in units			160,620
Cash distributions declared	(196,979)	(207,694)	(235,395)
Ending balance	4,069,951	3,855,925	4,646,922
SL Green Operating Partnership | Preferred Units | Series I Preferred Units
Increase (Decrease) in Partner's Capital
Beginning balance	221,932	221,932	221,932
Ending balance	221,932	221,932	221,932
SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning balance	$ 3,546,906	$ 4,313,497	$ 4,589,702
Beginning balance (units)	64,726	64,380	64,105
Net income (loss)	$ 22,010	$ (564,559)	$ (78,074)
Acquisition of subsidiary interest from noncontrolling interest	(4,130)		(29,742)
Perpetual preferred unit dividends	$ (14,950)	$ (14,950)	$ (14,950)
DRSPP proceeds (in units)	729	17	11
DRSPP proceeds	$ 52,308	$ 525	$ 525
Conversion of common units (in units)	124
Measurement adjustment for redeemable noncontrolling interest	$ (107,631)	$ (15,486)	$ 39,974
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in units)	455	329	274
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings	$ 26,848	$ 35,573	$ 32,034
Proceeds from issuance of common stock (in shares)	5,063
Proceeds from issuance of common stock	$ 386,790
Repurchases of common units (in units)			(1,971)
Repurchases of common units			$ (151,197)
Issuance of special distribution paid in units (in shares)			1,961
Issuance of special distribution paid in units			$ 160,620
Cash distributions declared	(196,979)	(207,694)	(235,395)
Ending balance	$ 3,711,172	$ 3,546,906	$ 4,313,497
Ending balance (units)	71,097	64,726	64,380
SL Green Operating Partnership | Accumulated Other Comprehensive Income
Increase (Decrease) in Partner's Capital
Beginning balance	$ 17,477	$ 49,604	$ (46,758)
Other comprehensive income (loss)	719	(32,127)	96,362
Ending balance	18,196	17,477	49,604
SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning balance	69,610	61,889	13,377
Net income (loss)	(928)	(4,568)	1,122
Acquisition of subsidiary interest from noncontrolling interest	(5,086)		(75)
Contributions to consolidated joint venture interests	6,656	15,066	52,164
Consolidation of partially owned entity	59,452
Cash distributions to noncontrolling interests	(11,053)	(2,777)	(4,699)
Ending balance	$ 118,651	$ 69,610	$ 61,889

Consolidated Statements of Ca_3

Consolidated Statements of Capital (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash distribution declared, per common share (in dollars per unit)	$ 3.0075	$ 3.2288	$ 3.6896
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per unit)	$ 3.0075	$ 3.2288	$ 3.6896

Consolidated Statements of Ca_4

Consolidated Statements of Cash Flows (Partnership) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net income (loss)	$ 30,222	$ (599,337)	$ (76,303)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	214,062	255,647	223,984
Equity in net loss from unconsolidated joint ventures	179,695	76,509	57,958
Distributions of cumulative earnings from unconsolidated joint ventures	12,992	9,897	780
Equity in net (gain) loss on sale of interest in unconsolidated joint venture/real estate	(208,144)	13,368	131
Purchase price and other fair value adjustments	(88,966)	17,260	8,118
Depreciable real estate reserves and impairments	104,071	382,374	6,313
(Gain) loss on sale of real estate, net	(3,025)	32,370	84,485
Loan loss and other investment reserves, net of recoveries	0	6,890	0
(Gain) loss on early extinguishment of debt	(43,762)	870	0
Deferred rents receivable	(1,535)	(17,903)	(5,749)
Non-cash lease expense	20,290	20,435	22,403
Other non-cash adjustments	46,219	28,174	(5,676)
Changes in operating assets and liabilities:
Tenant and other receivables	(11,804)	(1,725)	14,370
Related party receivables	(11,414)	15,788	6,666
Deferred lease costs	(29,271)	(17,427)	(21,792)
Other assets	15,968	(1,922)	(28,204)
Accounts payable, accrued expenses, other liabilities and security deposits	(74,501)	11,974	(30,839)
Deferred revenue	(4,799)	8,057	18,332
Lease liability - operating leases	(16,703)	(11,796)	1,111
Net cash provided by operating activities	129,595	229,503	276,088
Investing Activities
Acquisitions of real estate property	0	0	(64,491)
Additions to land, buildings and improvements	(211,869)	(259,663)	(300,770)
Acquisition deposits and deferred purchase price	(23,050)	0	0
Investments in unconsolidated joint ventures	(451,233)	(184,481)	(184,518)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	161,474	140,569	141,742
Net proceeds from disposition of real estate/joint venture interest	729,025	557,611	626,364
Cash and restricted cash assumed from acquisition and consolidation of real estate investment	19,017	0	60,494
Proceeds from sale or redemption of marketable securities	0	0	15,626
Investments in marketable securities	(12,368)	0	0
Investments in real estate loans held by consolidated securitization vehicles	(117,894)	0	0
Other investments	(21,535)	(17,334)	1,432
Origination of debt and preferred equity investments	(16,310)	(65,357)	(51,367)
Repayments or redemption of debt and preferred equity investments	63,496	0	181,293
Net cash provided by investing activities	118,753	171,345	425,805
Financing Activities
Proceeds from mortgages and other loans payable	4,450	0	381,980
Repayments of mortgages and other loans payable	(68,977)	(25,826)	(292,364)
Proceeds from revolving credit facility, term loans and senior unsecured notes	1,170,000	538,000	1,524,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(1,510,000)	(828,000)	(1,864,000)
Proceeds from stock options exercised and DRSPP issuance	52,308	525	525
Proceeds from issuance of common stock	386,790	0	0
Repurchase of common units	0	0	(151,197)
Redemption of preferred units	(2,503)	(11,700)	(17,967)
Redemption of OP units	(38,177)	(9,076)	(40,901)
Distributions to noncontrolling interests in other partnerships	(11,053)	(2,777)	(4,699)
Contributions from noncontrolling interests in other partnerships	6,584	6,932	52,164
Acquisition of subsidiary interest from noncontrolling interest	(7,289)	0	(29,817)
Distributions paid on common and preferred units	(218,823)	(230,931)	(262,136)
Other obligation related to secured borrowing	0	129,656	77,874
Tax withholdings related to restricted share awards	(182)	0	(3,915)
Deferred loan costs	(1,442)	(1,407)	(8,098)
Net cash used in financing activities	(252,229)	(449,383)	(654,823)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(3,881)	(48,535)	47,070
Cash, cash equivalents, and restricted cash at beginning of year	335,519	384,054	336,984
Cash, cash equivalents, and restricted cash at end of period	331,638	335,519	384,054
Supplemental cash flow disclosures:
Interest paid	200,752	229,119	169,519
Income taxes paid	9,001	7,815	5,358
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Exchange of preferred equity investment for real estate or equity in joint venture	0	0	190,652
Exchange of debt investment for real estate or equity in joint venture	0	349,946	193,995
Assumption of mortgage and mezzanine loans	0	0	1,712,750
Tenant improvements and capital expenditures payable	0	0	18,518
Acquisition of subsidiary interest from noncontrolling interest	1,927	0	0
Consolidation of a subsidiary	50,377	0	0
Investment in joint venture	10,639	0	47,135
Deconsolidation of a subsidiary	0	101,351	0
Deconsolidation of subsidiary debt	0	1,712,750	0
Debt and preferred equity investments	1,133	0	302
Extinguishment of debt	46,835	0	0
Removal of fully depreciated commercial real estate properties	6,903	16,313	30,359
Contribution to consolidated joint venture by noncontrolling interest	72	8,134	0
Share repurchase or redemption payable	9,514	9,513	0
Recognition of right of use assets and related lease liabilities	0	0	57,938
Consolidation of securitization vehicle assets	600,521	0	0
Consolidation of securitization vehicle liabilities	600,521	0	0
Cash and cash equivalents	184,294	221,823	203,273
Restricted cash	147,344	113,696	180,781
Total cash, cash equivalents, and restricted cash	331,638	335,519	384,054
SL Green Operating Partnership
Operating Activities
Net income (loss)	30,222	(599,337)	(76,303)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	214,062	255,647	223,984
Equity in net loss from unconsolidated joint ventures	179,695	76,509	57,958
Distributions of cumulative earnings from unconsolidated joint ventures	12,992	9,897	780
Equity in net (gain) loss on sale of interest in unconsolidated joint venture/real estate	(208,144)	13,368	131
Purchase price and other fair value adjustments	(88,966)	17,260	8,118
Depreciable real estate reserves and impairments	104,071	382,374	6,313
(Gain) loss on sale of real estate, net	(3,025)	32,370	84,485
Loan loss and other investment reserves, net of recoveries	0	6,890	0
(Gain) loss on early extinguishment of debt	(43,762)	870	0
Deferred rents receivable	(1,535)	(17,903)	(5,749)
Non-cash lease expense	20,290	20,435	22,403
Other non-cash adjustments	46,219	28,174	(5,676)
Changes in operating assets and liabilities:
Tenant and other receivables	(11,804)	(1,725)	14,370
Related party receivables	(11,414)	15,788	6,666
Deferred lease costs	(29,271)	(17,427)	(21,792)
Other assets	15,968	(1,922)	(28,204)
Accounts payable, accrued expenses, other liabilities and security deposits	(74,501)	11,974	(30,839)
Deferred revenue	(4,799)	8,057	18,332
Lease liability - operating leases	(16,703)	(11,796)	1,111
Net cash provided by operating activities	129,595	229,503	276,088
Investing Activities
Acquisitions of real estate property	0	0	(64,491)
Additions to land, buildings and improvements	(211,869)	(259,663)	(300,770)
Acquisition deposits and deferred purchase price	(23,050)	0	0
Investments in unconsolidated joint ventures	(451,233)	(184,481)	(184,518)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	161,474	140,569	141,742
Net proceeds from disposition of real estate/joint venture interest	729,025	557,611	626,364
Cash and restricted cash assumed from acquisition and consolidation of real estate investment	19,017	0	60,494
Proceeds from sale or redemption of marketable securities	0	0	15,626
Investments in marketable securities	(12,368)	0	0
Investments in real estate loans held by consolidated securitization vehicles	(117,894)	0	0
Other investments	(21,535)	(17,334)	1,432
Origination of debt and preferred equity investments	(16,310)	(65,357)	(51,367)
Repayments or redemption of debt and preferred equity investments	63,496	0	181,293
Net cash provided by investing activities	118,753	171,345	425,805
Financing Activities
Proceeds from mortgages and other loans payable	4,450	0	381,980
Repayments of mortgages and other loans payable	(68,977)	(25,826)	(292,364)
Proceeds from revolving credit facility, term loans and senior unsecured notes	1,170,000	538,000	1,524,000
Repayments of revolving credit facility, term loans and senior unsecured notes	(1,510,000)	(828,000)	(1,864,000)
Proceeds from stock options exercised and DRSPP issuance	52,308	525	525
Repurchase of common units	0	0	(151,197)
Redemption of preferred units	(2,503)	(11,700)	(17,967)
Redemption of OP units	(38,177)	(9,076)	(40,901)
Distributions to noncontrolling interests in other partnerships	(11,053)	(2,777)	(4,699)
Contributions from noncontrolling interests in other partnerships	6,584	6,932	52,164
Acquisition of subsidiary interest from noncontrolling interest	(7,289)	0	(29,817)
Distributions paid on common and preferred units	(232,738)	(245,710)	(278,408)
Other obligation related to secured borrowing	0	129,656	77,874
Tax withholdings related to restricted share awards	(182)	0	(3,915)
Deferred loan costs	(1,442)	(1,407)	(8,098)
Net cash used in financing activities	(252,229)	(449,383)	(654,823)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(3,881)	(48,535)	47,070
Cash, cash equivalents, and restricted cash at beginning of year	335,519	384,054	336,984
Cash, cash equivalents, and restricted cash at end of period	331,638	335,519	384,054
Supplemental cash flow disclosures:
Interest paid	200,752	229,119	169,519
Income taxes paid	9,001	7,815	5,358
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Exchange of preferred equity investment for real estate or equity in joint venture	0	0	190,652
Exchange of debt investment for real estate or equity in joint venture	0	349,946	193,995
Assumption of mortgage and mezzanine loans	0	0	1,712,750
Issuance of special distribution paid in units	0	0	160,620
Tenant improvements and capital expenditures payable	0	0	18,518
Measurement adjustment for redeemable noncontrolling interest	107,632	15,486	39,974
Investment in joint venture	10,639	0	47,135
Deconsolidation of a subsidiary	0	101,351	0
Deconsolidation of subsidiary debt	0	1,712,750	0
Debt and preferred equity investments	1,133	0	302
Extinguishment of debt	46,835	0	0
Removal of fully depreciated commercial real estate properties	6,903	16,313	30,359
Contribution to consolidated joint venture by noncontrolling interest	72	8,134	0
Share repurchase or redemption payable	9,514	9,513	0
Recognition of right of use assets and related lease liabilities	0	0	57,938
Consolidation of securitization vehicle assets	600,521	0	0
Consolidation of securitization vehicle liabilities	600,521	0	0
Cash and cash equivalents	184,294	221,823	203,273
Restricted cash	147,344	113,696	180,781
Total cash, cash equivalents, and restricted cash	$ 331,638	$ 335,519	$ 384,054

Consolidated Statements of Ca_5

Consolidated Statements of Cash Flows (Partnership) (Parenthetical) - $ / shares	3 Months Ended			12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Cash Flows [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.2575	$ 0.2500	$ 0.2708	$ 3.0075	$ 3.2288	$ 3.6896

Organization and Basis of Prese

Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation SL Green Realty Corp., which is referred to as the Company or SL Green, a Maryland corporation, and SL Green Operating Partnership, L.P., which is referred to as SLGOP or the Operating Partnership, a Delaware limited partnership, were formed in June 1997 for the purpose of combining the commercial real estate business of S.L. Green Properties, Inc. and its affiliated partnerships and entities. The Operating Partnership received a contribution of interest in the real estate properties, as well as 95% of the economic interest in the management, leasing and construction companies which are referred to as S.L. Green Management Corp, or the Service Corporation. All of the management, leasing and construction services that are provided to the properties that are wholly owned by us and that are provided to certain joint ventures are conducted through SL Green Management LLC and S.L. Green Management Corp., respectively, which are 100% owned by the Operating Partnership. The Company has qualified, and expects to qualify in the current fiscal year, as a real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code, and operates as a self-administered, self-managed REIT. A REIT is a legal entity that holds real estate interests and, through payments of dividends to stockholders, is permitted to minimize the payment of Federal income taxes at the corporate level. Unless the context requires otherwise, all references to "we," "our" and "us" means the Company and all entities owned or controlled by the Company, including the Operating Partnership. Substantially all of our assets are held by, and all of our operations are conducted through, the Operating Partnership. The Company is the sole managing general partner of the Operating Partnership. As of December 31, 2024, noncontrolling investors held, in the aggregate, a 5.97% limited partnership interest in the Operating Partnership. We refer to these interests as the noncontrolling interests in the Operating Partnership. The Operating Partnership is considered a variable interest entity, or VIE, in which we are the primary beneficiary. See Note 11, "Noncontrolling Interests on the Company's Consolidated Financial Statements." On December 31, 2024, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties: Consolidated Unconsolidated Total Location Property Number of Buildings Approximate Square Feet (unaudited) Number of Buildings Approximate Square Feet (unaudited) Number of Buildings Approximate Square Feet (unaudited) Weighted Average Leased Occupancy (1) (unaudited) Commercial: Manhattan Office 15 9,587,441 9 12,175,149 24 21,762,590 92.5 % Retail 2 30,496 1 12,946 3 43,442 100.0 % Development/Redevelopment 2 (2) 880,771 1 1,385,484 3 2,266,255 N/A 19 10,498,708 11 13,573,579 30 24,072,287 92.5 % Suburban Office 7 862,800 — — 7 862,800 73.5 % Total commercial properties 26 11,361,508 11 13,573,579 37 24,935,087 91.8 % Residential: Manhattan Residential 1 (2) 140,382 1 221,884 2 362,266 99.1 % Total core portfolio 27 11,501,890 12 13,795,463 39 25,297,353 91.9 % Alternative Strategy Portfolio — — 7 2,567,025 7 2,567,025 63.0 % (1) The weighted average leased occupancy for commercial properties represents the total leased square feet divided by total square footage at acquisition. The weighted average leased occupancy for residential properties represents the total leased units divided by total available units. Properties under construction are not included in the calculation of weighted average leased occupancy. (2) As of December 31, 2024, we owned a building at 7 Dey Street / 185 Broadway that was comprised of approximately 140,382 square feet (unaudited) of residential space and approximately 50,206 square feet (unaudited) of office and retail space that is under development. For the purpose of this report, we have included this building in the number of residential properties we own. However, we have included only the residential square footage in the residential approximate square footage, and have listed the balance of the square footage as development square footage. As of December 31, 2024, we also managed one office building and one retail building owned by a third party encompassing approximately 0.4 million square feet (unaudited), and held debt and preferred equity investments with a book value of $303.7 million, excluding debt and preferred equity investments and other financing receivables totaling $9.7 million that are included in balance sheet line items other than the Debt and preferred equity investments line item. Partnership Agreement In accordance with the partnership agreement of the Operating Partnership, or the Operating Partnership Agreement, we allocate all distributions and profits and losses in proportion to the percentage of ownership interests of the respective partners, subject to the priority distributions with respect to preferred units and special provisions that apply to Long Term Incentive Plan ("LTIP") Units. As the managing general partner of the Operating Partnership, we are required to take such reasonable efforts, as determined by us in our sole discretion, to cause the Operating Partnership to distribute sufficient amounts to enable the payment of sufficient dividends by us to minimize any Federal income or excise tax at the Company level. Under the Operating Partnership Agreement, each limited partner has the right to redeem units of limited partnership interests for cash, or if we so elect, shares of SL Green's common stock on a one-for-one basis. Subsequent Events

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Principles of Consolidation The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly owned or controlled by us. Entities which we have significant influence, but do not control, through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated. We consolidate a VIE in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income (loss) attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine the rights provided to each party and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan. Investment in Commercial Real Estate Properties Real estate properties are presented at cost less accumulated depreciation and amortization. Costs directly related to the development or redevelopment of properties are capitalized. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity at their respective fair values on the acquisition date. When we acquire our partner's equity interest in an existing unconsolidated joint venture and gain control over the investment, we record the consolidated investment at fair value. The difference between the book value of our equity investment on the purchase date and our share of the fair value of the investment's purchase price is recorded as a purchase price fair value adjustment in our consolidated statements of operations. See Note 3, "Property Acquisitions." We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from 3 years to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from 1 year to 15 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from 1 year to 15 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. Origination costs are amortized as an expense over the remaining life of the lease and tenant improvements are amortized over the shorter of the remaining life of the lease or useful life of improvement (or charged against earnings if the lease is terminated prior to its contractual expiration date). When allocating the purchase price of real estate, we assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. As of December 31, 2024, the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 10.0 years, 12.1 years, and 8.9 years, respectively. The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if i) the lease transfers ownership of the asset at the end of the lease term, ii) the lease grants an option to purchase the asset that we are reasonably certain to exercise, iii) the lease term is for a major part of the remaining economic life of the asset, iv) the present value of the lease payments equals or exceeds substantially all of the fair value of the underlying asset, or v) the underlying asset is of such a specialized nature that it is expected to have no alternative use to the lessor at the end of the lease term. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company's collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset. We incur a variety of costs in the development and leasing of our properties. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and building under development include specifically identifiable costs. The capitalized costs include, but are not limited to, pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year after major construction activity ceases. We cease capitalization on the portions substantially completed and occupied or held available for occupancy, and capitalize only those costs associated with the portions under construction. Properties other than Right of use assets - operating leases are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Category Term Building (fee ownership) 40 years Building improvements shorter of remaining life of the building or useful life Building (leasehold interest) lesser of 40 years or remaining term of the lease Right of use assets - financing leases lesser of 40 years or remaining term of the lease Furniture and fixtures 4 to 7 years Tenant improvements shorter of remaining term of the lease or useful life Right of use assets - operating leases are amortized over the remaining lease term. The amortization is made up of the principal amortization under the lease liability plus or minus the straight-line adjustment of the operating lease rent under ASC 842. Depreciation expense (including amortization of right of use assets - financing leases) totaled $183.9 million, $221.0 million, and $190.1 million for the years ended December 31, 2024, 2023 and 2022, respectively. Properties are individually evaluated for impairment quarterly or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. A consolidated property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) and terminal value to be generated by the property is less than the carrying value of the property taking into account the appropriate capitalization rate in determining the future terminal value. To the extent impairment has occurred, the loss will be measured as the excess of the carrying amount of the property over the fair value of the property as calculated in accordance with Accounting Standards Codification, or ASC 820. We also evaluate our real estate consolidated properties for impairment when a property has been classified as held for sale. Real estate assets held for sale are valued at the lower of their carrying value or fair value less costs to sell and depreciation expense is no longer recorded. In April 2024, the Company entered into an agreement to sell the property at 719 Seventh Avenue for $30.5 million. As a result of the pending sale, the Company recorded a $46.3 million charge to reduce the carrying value of its investment to the contracted purchase price for the three months ended March 31, 2024, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. The transaction closed during the second quarter of 2024. See Note 4, "Properties Held for Sale and Property Dispositions." During the year ended December 31, 2024, the Company recorded a $17.6 million charge, reflective of $15.1 million of capitalized interest, to reduce the carrying value of the residential condominium units at 760 Madison Avenue, based on the total of the sales contracts that the Company entered into for these units. This charge is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. The remaining transactions are expected to close during the first quarter of 2025. See Note 4, "Properties Held for Sale and Property Dispositions." During the year ended December 31, 2024, through a series of transactions, the Company reduced its ownership interest in 690 Madison Avenue to 90.0% and repaid the previous $60.9 million mortgage on the property for a net payment of $32.1 million. As a result of the transactions, the Company assessed the property for recoverability and recorded a $34.3 million charge to write down the carrying value of the investment, which is included in Depreciable real estate reserves and impairments in the consolidated statement of operations. For the year ended December 31, 2024, we recognized a reduction of rental revenue of ($2.6 million) for the amortization of aggregate above-market leases in excess of below-market leases resulting from the allocation of the purchase price of the applicable properties. For the years ended December 31, 2023 and 2022, we recognized $14.2 million and $5.7 million, respectively, of rental revenue for the amortization of aggregate below-market leases in excess of above-market leases. The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Identified intangible assets (included in other assets): Gross amount $ 378,277 $ 189,680 Accumulated amortization (197,211) (184,902) Net $ 181,066 $ 4,778 Identified intangible liabilities (included in deferred revenue): Gross amount $ 243,703 $ 205,394 Accumulated amortization (204,092) (202,089) Net $ 39,611 $ 3,305 The estimated annual amortization of acquired above-market leases, net of acquired (below-market) leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands): 2025 $ 5,828 2026 5,265 2027 4,754 2028 4,058 2029 3,719 The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (in thousands): 2025 $ 30,485 2026 26,943 2027 21,648 2028 16,492 2029 15,008 Cash and Cash Equivalents We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents. Restricted Cash Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements. Fair Value Measurements See Note 16, "Fair Value Measurements." Investment in Marketable Securities At acquisition, we designate a debt security as held-to-maturity, available-for-sale, or trading. As of December 31, 2024, we did not have any debt securities designated as trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. We account for our held-to-maturity securities at amortized cost basis. Credit losses for our debt securities are recognized in accordance with ASC 326. No allowance for loan losses were recognized for the years ended December 31, 2024, 2023 and 2022. We account for equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income. As of December 31, 2024 and 2023, we held the following marketable securities (in thousands): December 31, 2024 December 31, 2023 Commercial mortgage-backed securities - available-for-sale $ 17,323 $ 9,591 Commercial mortgage-backed securities - held-to-maturity 5,489 — Total investment in marketable securities $ 22,812 $ 9,591 The cost basis of the available-for-sale commercial mortgage-backed securities ("CMBS") was $18.3 million and $11.5 million as of December 31, 2024 and 2023, respectively. These securities mature at various times through 2030. As of December 31, 2024, one security was in an unrealized gain position of $0.2 million with a fair market value of $5.5 million, and two securities were in an unrealized loss position of $1.5 million and fair market value of $11.8 million with one of the securities being in a continuous unrealized loss position for more than 12 months. All securities were in an unrealized loss position as of December 31, 2023 with an unrealized loss of $1.9 million and a fair market value of $9.6 million and were in a continuous unrealized loss position for more than 12 months. We do not intend to sell our other securities, and it is more likely than not that we will not be required to sell the investment before the recovery of their amortized cost basis. The cost basis of the held-to-maturity CMBS was $5.5 million as of December 31, 2024, and was purchased at a $0.2 million discount. We had no held-to-maturity CMBS as of December 31, 2023. We did not dispose of any debt marketable securities during the years ended December 31, 2024 and December 31, 2023. During the year ended December 31, 2022, we received aggregate net proceeds of $7.8 million from the sale of one debt marketable security and $3.7 million from the repayment of one debt marketable security. We held no equity marketable securities as of December 31, 2024 and December 31, 2023. During the year ended December 31, 2022, we sold the one equity marketable security that was held as of December 31, 2021 for which we received aggregate net proceeds of $4.2 million. We recognized $6.5 million of realized losses for the year ended December 31, 2022. Investment in CMBS Securitization Trusts We may be contracted to provide special servicing activities for CMBS securitization trusts and, in certain cases, we may also acquire securities in these trusts. In certain cases, we may acquire the controlling class of the trust and we may have the right to designate, and remove, the special servicer for these trusts. These circumstances may result in our consolidating the securitization trusts on our financial statements. We evaluate all of our positions and special servicer appointments for consolidation, which are considered to be VIEs to the Company. As the special servicer, we provide services on defaulted loans within the trusts as permitted by the underlying contractual agreements. We receive a fee in exchange for these services. The rights provided to us as special servicer give us the ability to direct activities that could significantly impact the trust's economic performance, which requires consolidation of the securitization trust unless a third party has the right to unilaterally remove us as special servicer without cause. In such instances where we can be removed as special servicer without cause, we do not have the power to direct activities that most significantly impact the trust's economic performance and would not consolidate the securitization trust. For CMBS securitization trusts in which we are determined to be the primary beneficiary, we consolidate the securitization trusts on our consolidated balance sheets. The consolidation of such securitization trusts results in a gross presentation of the underlying collateral loans as assets as well as the senior CMBS positions owned by third parties, which are presented as liabilities on our consolidated balance sheets. The assets of the consolidated securitization trust can only be used to satisfy the liabilities of that securitization and are not available to the Company for any other purpose. Additionally, the senior CMBS securitization trust obligations can only be satisfied through repayment of the underlying collateral loans as they do not have any recourse to the Company or our assets. The Company has not provided any guarantees with respect to the performance or repayment of the senior CMBS obligations. While consolidation of the securitization trust increases the gross presentation of our consolidated balance sheets, it does not impact the economic exposure or performance of the Company as it is limited to that of the actual investment in the CMBS securitization trust, and not the consolidated senior obligations. As of December 31, 2024 and 2023, we consolidated the following CMBS securitization trusts (in thousands): December 31, 2024 December 31, 2023 Maturity Type Fair Value (1) Principal Value Fair Value Principal Value Real estate loans held by consolidated securitization vehicles $ 709,095 $ 894,000 $ — $ — 2023 - 2024 (2) Senior obligations of consolidated securitization vehicles 590,131 688,346 — — 2023 - 2024 (2) Real estate loans held by consolidated securitization vehicles in excess of senior obligations of consolidated securitization vehicles $ 118,964 $ 205,654 $ — $ — (1) Includes $134.8 million and $34.2 million of assets and liabilities, respectively, for a loan that is on non-accrual and is accounted for on an amortized cost basis. (2) The Company is in discussions with the respective borrowers on the resolution of the past maturities. We have elected to record the associated interest income and interest expense for these investments as separate line items on our consolidated statements of operations. The amounts recorded in Interest income from real estate loans held by consolidated securitization vehicles on our consolidated statements of operations include the Company's interest income as well as the interest income associated with CMBS positions owned by third parties, which is offset by the amounts recorded in Interest expense on senior obligations of consolidated securitization vehicles on our consolidated statements of operations. As a result, the net impact is limited to the interest income on the CMBS securities we own directly and not the gross consolidated interest income and interest expense. Investments in Unconsolidated Joint Ventures We account for our investments in unconsolidated joint ventures under the equity method of accounting in cases where we exercise significant influence over, but do not control, these entities and are not considered to be the primary beneficiary. We consolidate those joint ventures that we control or which are variable interest entities (each, a "VIE") and where we are considered to be the primary beneficiary. In all these joint ventures, the rights of the joint venture partner are both protective as well as participating. In scenarios where we are determined to be the primary beneficiary in a VIE, these substantive participating rights held by our joint venture partner preclude us from consolidating these VIE entities. These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for equity in net income (loss) and cash contributions and distributions. Equity in net income (loss) from unconsolidated joint ventures is allocated based on our ownership or economic interest in each joint venture and includes adjustments related to basis differences in accounting for the investment. When a capital event (as defined in each joint venture agreement) such as a refinancing occurs, if return thresholds are met, future equity income will be allocated at our increased economic interest. We recognize incentive income from unconsolidated real estate joint ventures as income to the extent it is earned and not subject to a clawback feature. Distributions we receive from unconsolidated real estate joint ventures in excess of our basis in the investment are recorded as offsets to our investment balance if we remain liable for future obligations of the joint venture or may otherwise be committed to provide future additional financial support. We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on each joint ventures' actual and projected cash flows. Aside from charges noted in Note 6, "Investment in Unconsolidated Joint Ventures," we do not believe that the values of any of our equity investments were impaired at December 31, 2024. We may originate loans for real estate acquisition, development and construction ("ADC loans"), where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with the accounting for our debt and preferred equity investments. Deferred Lease Costs Deferred lease costs consist of incremental fees and direct costs that would not have been incurred if the lease had not been obtained and are amortized on a straight-line basis over the related lease term. Certain of our employees provide leasing services to the wholly owned properties. For the years ended December 31, 2024, 2023 and 2022, $8.5 million, $6.8 million, and $6.6 million of their compensation, respectively, was capitalized and is amortized over an estimated average lease term of seven years. Deferred Financing Costs Deferred financing costs represent commitment fees, legal, title and other third party costs associated with obtaining commitments for financing which result in a closing of such financing. These costs are amortized over the terms of the respective agreements. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking financing transactions, which do not close, are expensed in the period in which it is determined that the financing will not close. Deferred financing costs related to a recognized debt liability are presented in the consolidated balance sheet as a direct deduction from the carrying amount of that debt liability. Lease Classification Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable. Revenue Recognition Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee. To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we or the tenant are the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date. The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842. We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired. Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt. Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related i

Property Acquisitions and Conso

Property Acquisitions and Consolidations	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Property Acquisitions and Consolidations	Property Acquisitions and Consolidations 2024 Acquisitions During the year ended December 31, 2024, we did not acquire any properties from a third party. 2024 Property Consolidations The following table summarizes the properties consolidated during the year ended December 31, 2024: Property Consolidation Date Property Type Approximate Square Feet Gross Asset Valuation 100 Park Avenue (1) December 2024 Fee Interest 834,000 $ 441.0 10 East 53rd Street (2) March 2024 Fee Interest 354,300 236.0 (1) In December 2024, the Company amended the joint venture agreement with its partner. As a result of the amended terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a positive fair value adjustment of $117.8 million, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to December 2024, the investment was accounted for under the equity method. See Note 16, "Fair Value Measurements." (2) In March 2024, the Company entered into an agreement to acquire its partner's 45.0% interest in the joint venture for cash consideration of $7.2 million, which is net of all outstanding debt obligations at contract signing. As a result of the contract terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a negative fair value adjustment of ($55.7 million), which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to March 2024, the investment was accounted for under the equity method. In December 2024, the Company closed on the acquisition of the partner's interest. See Note 16, "Fair Value Measurements." 2023 Acquisitions During the year ended December 31, 2023, we did not acquire any properties from a third party. 2022 Acquisitions The following table summarizes the properties acquired during the year ended December 31, 2022: Property Acquisition Date Property Type Approximate Square Feet Gross Asset Valuation 245 Park Avenue (1) September 2022 Fee Interest 1,782,793 $ 1,960.0 (1) On October 31, 2021, HNA, through an affiliated entity, filed for Chapter 11 bankruptcy protection on account of its investment in 245 Park Avenue, together with another asset in Chicago. On July 8, 2022, certain of the debtors and affiliates of SL Green entered into a Plan Sponsorship and Investment Agreement (the "Plan"). Since the debtors did not receive any qualifying bids for the property and the Plan was confirmed, SL Green acquired full ownership and control of the property in September 2022, at which time our outstanding preferred equity and accrued interest balance were credited to our equity investment in the property. We recorded the assets acquired and liabilities assumed at fair value.

Properties Held for Sale and Pr

Properties Held for Sale and Property Dispositions	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Properties Held for Sale and Property Dispositions	Properties Held for Sale and Property Dispositions Properties Held for Sale As of December 31, 2024 and 2023, no properties were classified as held for sale. Property Dispositions The following table summarizes the properties sold during the years ended December 31, 2024, 2023, and 2022: Property Disposition Date Property Type Unaudited Approximate Usable Square Feet Sales Price (1) (in millions) (Loss) Gain on Sale (2) (in millions) Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units) (3) December 2024 Fee Interest 13,590 $ 63.5 $ (1.5) Palisades Premier Conference Center July 2024 Fee Interest 450,000 26.3 7.3 719 Seventh Avenue June 2024 Fee Interest 10,040 30.5 (2.0) 245 Park Avenue (4) June 2023 Fee Interest 1,782,793 1,995.0 (28.3) 885 Third Avenue - Office Condominium Units (5) December 2022 Fee / Leasehold Interest 414,317 300.4 (24.0) 609 Fifth Avenue June 2022 Fee Interest 138,563 100.5 (80.2) 1591-1597 Broadway May 2022 Fee Interest 7,684 121.0 (4.5) 1080 Amsterdam Avenue April 2022 Leasehold Interest 85,250 42.7 17.9 707 Eleventh Avenue February 2022 Fee Interest 159,720 95.0 (0.8) (1) Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property. (2) The (losses) gains on sale are net of $5.1 million, $11.3 million, and $11.2 million of employee compensation accrued in connection with the realization of the investment dispositions during the years ended December 31, 2024, 2023, and 2022, respectively. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) The remaining condominium units at 760 Madison are under contract and expected to close once completed in the first quarter of 2025. (4) In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our retained investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) that is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Venture" and Note 16, " Fair Value Measurements." (5) In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building.

Debt and Preferred Equity Inves

Debt and Preferred Equity Investments	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Debt and Preferred Equity Investments	Debt and Preferred Equity Investments Below is a summary of the activity in our debt and preferred equity investments for the years ended December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Balance at beginning of year (1) $ 346,745 $ 623,280 Debt investment originations/fundings/accretion (2) 12,890 72,160 Preferred equity investment originations/accretion (2) (3) 8,720 8,142 Redemptions/sales/syndications/equity ownership/amortization (64,629) (349,947) Net change in loan loss reserves — (6,890) Balance at end of period (1) (4) $ 303,726 $ 346,745 (1) Net of unamortized fees, discounts, and premiums. (2) Accretion includes amortization of fees and discounts and paid-in-kind investment income. (3) Excludes a $214.7 million preferred equity investment that is included in Investment in unconsolidated joint ventures in our consolidated balance sheet. See Note 6, "Investments in Unconsolidated Joint Ventures." (4) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio. Below is a summary of our debt and preferred equity investments as of December 31, 2024 (dollars in thousands): Floating Rate Fixed Rate Total Carrying Value Senior Financing Maturity (2) Type Carrying Value Face Value Interest Rate (1) Carrying Value Face Value Interest Rate Mezzanine Debt $ 117,006 $ 117,160 S + 5.06 - 11.75% $ 50,000 $ 50,000 8.00 - 8.40% $ 167,006 (3) $ 812,021 2025 - 2029 Preferred Equity (4) — — — 136,720 136,720 6.5% 136,720 250,000 2027 Balance at end of period $ 117,006 $ 117,160 $ 186,720 $ 186,720 $ 303,726 $ 1,062,021 (1) Floating interest rates are presented with the stated spread over Term SOFR ("S"). (2) Excludes available extension options to the extent they have not been exercised as of the date of this filing. (3) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio. (4) Excludes a $214.7 million preferred equity investment that is included in Investment in unconsolidated joint ventures in our consolidated balance sheet. See Note 6, "Investments in Unconsolidated Joint Ventures." The following table is a roll forward of our total allowance for loan losses for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, 2024 2023 2022 Balance at beginning of year $ 13,520 $ 6,630 $ 6,630 Current period provision for loan loss — 6,890 — Balance at end of period $ 13,520 (1) $ 13,520 (1) $ 6,630 (1) As of December 31, 2024, all financing receivables on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $53.5 million, which is included in the Company's alternative strategy portfolio. As of December 31, 2024, one investment, which is fully reserved, was not performing in accordance with its respective terms. As of December 31, 2023, two investments with a carrying value, net of reserves, of $49.8 million were not performing in accordance with their respective terms. This is further discussed in the Debt Investments and Preferred Equity Investments tables below. No other financing receivables were 90 days past due as of December 31, 2024 and December 31, 2023. The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of December 31, 2024 and 2023 (dollars in thousands): Risk Rating December 31, 2024 December 31, 2023 1 - Low Risk Assets - Low probability of loss $ 156,720 $ 210,333 2 - Watch List Assets - Higher potential for loss (1) 147,006 136,412 3 - High Risk Assets - Loss more likely than not — — $ 303,726 $ 346,745 (1) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio. The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of December 31, 2024 (dollars in thousands): As of December 31, Risk Rating 2024 (1) 2023 (1) 2022 (1) Prior (1)(2) Total 1 - Low Risk Assets - Low probability of loss $ — $ — $ — $ 156,720 $ 156,720 2 - Watch List Assets - Higher potential for loss — — — 147,006 (3) 147,006 3 - High Risk Assets - Loss more likely than not — — — — — $ — $ — $ — $ 303,726 $ 303,726 (1) Year in which the investment was originated or acquired by us or in which a material modification occurred. (2) During the year ended December 31, 2023, we recognized a $6.9 million provision for loan loss related to an investment originated prior to 2021. (3) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio. We have determined that we have one portfolio segment of financing receivables as of December 31, 2024 and 2023 comprised of commercial real estate which is primarily recorded in debt and preferred equity investments. Included in Other assets is an additional amount of financing receivables representing loans to joint venture partners totaling $23.7 million and $8.8 million as of December 31, 2024 and 2023, respectively. The Company recorded no provisions for loan losses related to these financing receivables for the years ended December 31, 2024 and 2023, respectively. All of these loans have a risk rating of 2 and were performing in accordance with their respective terms. Debt Investments As of December 31, 2024 and 2023, we held the following debt investments with an aggregate weighted average current yield of 6.02% as of December 31, 2024 (dollars in thousands): December 31, 2024 December 31, 2023 Loan Type Future Funding Obligations Senior Financing Carrying Value (1) Carrying Value (1) Maturity Date (2) Fixed Rate Investments: Mezzanine Loan (3) (4) (5) $ — $ 105,000 $ 13,366 $ 13,366 January 2025 Mezzanine Loan (6) — 95,000 30,000 30,000 January 2025 Mezzanine Loan — 85,000 20,000 20,000 December 2029 Total fixed rate $ — $ 285,000 $ 63,366 $ 63,366 Floating Rate Investments: Mezzanine Loan $ — $ 54,000 $ 8,991 $ 8,243 July 2025 Mezzanine Loan (5) (7) — 283,000 53,687 50,000 December 2025 Mezzanine Loan 4,603 190,021 54,482 48,323 January 2026 Mezzanine Loan — — — 62,333 May 2024 Total floating rate $ 4,603 $ 527,021 $ 117,160 $ 168,899 Allowance for loan loss $ — $ — $ (13,520) $ (13,520) Total $ 4,603 $ 812,021 $ 167,006 $ 218,745 (1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees. (2) Represents contractual maturity, excluding any extension options to the extent they have not been exercised as of the date of this filing. (3) Carrying value is net of a $12.0 million participation that was sold and did not meet the conditions for sale accounting, which is included in Other assets and Other liabilities on the consolidated balance sheets. (4) This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of December 31, 2024. No investment income has been recognized subsequent to it being put on non-accrual. In the first quarter of 2023, the Company fully reserved the balance of the investment. Additionally, we determined the borrower entity to be a VIE in which we are not the primary beneficiary. (5) Included in the Company's alternative strategy portfolio. (6) The Company is in discussions with the borrower with respect to the loan. (7) This loan was put on non-accrual in January 2023 and remains on non-accrual as of December 31, 2024. No investment income has been recognized since it was put on non-accrual. In December 2024, the maturity date of the loan was extended to December 2025. Additionally, we determined the borrower entity to be a VIE in which we are not the primary beneficiary. Preferred Equity Investments As of December 31, 2024 and 2023, we held the following preferred equity investments with an aggregate weighted average current yield of 6.55% as of December 31, 2024 (dollars in thousands), excluding a $214.7 million preferred equity investment that is included in Investment in unconsolidated joint ventures in our consolidated balance sheet: December 31, 2024 December 31, 2023 Type Future Funding Senior Carrying Value (1) Carrying Value (1) Mandatory Redemption (2) Preferred Equity $ — $ 250,000 $ 136,720 $ 128,000 February 2027 Total $ — $ 250,000 $ 136,720 $ 128,000 (1) Carrying value is net of deferred origination fees. (2) Represents contractual redemption, excluding any unexercised extension options.

Investments in Unconsolidated J

Investments in Unconsolidated Joint Ventures	12 Months Ended
	Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures We have investments in several real estate joint ventures with various third-party partners. As of December 31, 2024, the book value of these investments was $2.7 billion, net of investments with negative book values totaling $150.5 million for which we have an implicit commitment to fund future capital needs. As of December 31, 2024, 800 Third Avenue and our preferred equity investment in 625 Madison Avenue are VIEs in which we are not the primary beneficiary. As of December 31, 2023, 800 Third Avenue and 625 Madison Avenue were VIEs in which we are not the primary beneficiary. Our net equity investment in these VIEs was $263.8 million as of December 31, 2024, and $437.9 million as of December 31, 2023. Our maximum loss is limited to the amount of our equity investment in these VIEs. See the "Principles of Consolidation" section of Note 2, "Significant Accounting Policies." All other investments below are voting interest entities. As we have the ability to exercise significant influence over, but do not control, the joint ventures listed below, we account for them under the equity method of accounting. The table below provides general information on each of our joint ventures as of December 31, 2024: Property Partner Economic Interest (1) Unaudited Approximate Square Feet 800 Third Avenue Private Investors 60.52% 526,000 919 Third Avenue New York State Teacher's Retirement System 51.00% 1,454,000 11 West 34th Street (2) Private Investor / Wharton Properties 30.00% 17,150 280 Park Avenue Vornado Realty Trust 50.00% 1,219,158 1552-1560 Broadway (2) (3) Wharton Properties 50.00% 57,718 650 Fifth Avenue (2) (4) Wharton Properties 50.00% 69,214 11 Madison Avenue PGIM Real Estate 60.00% 2,314,000 One Vanderbilt Avenue (5) National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd 60.01% 1,657,198 Worldwide Plaza (2) (6) RXR Realty / New York REIT 24.95% 2,048,725 1515 Broadway Allianz Real Estate of America 56.87% 1,750,000 2 Herald Square (2) (7) (8) Israeli Institutional Investor 95.00% 369,000 115 Spring Street (2) (9) Private Investor 51.00% 5,218 15 Beekman (10) A fund managed by Meritz Alternative Investment Management 20.00% 221,884 85 Fifth Avenue (11) Wells Fargo 36.27% 12,946 One Madison Avenue (12) National Pension Service of Korea / Hines Interest LP / International Investor 25.50% 1,048,700 220 East 42nd Street A fund managed by Meritz Alternative Investment Management 51.00% 1,135,000 450 Park Avenue (13) Korean Institutional Investor / Israeli Institutional Investor 25.10% 337,000 245 Park Avenue (14) U.S. Affiliate of Mori Trust Co., Ltd 50.10% 1,782,793 625 Madison Avenue (15) Private Investor 90.93% 563,000 (1) Economic interest represent the Company's interests in the joint venture as of December 31, 2024. Changes in economic interests within the current year are disclosed in the notes below. (2) Included in the Company's alternative strategy portfolio. (3) The joint venture owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. In December 2023, following an assessment of the investment for recoverability, the Company recorded a charge of $8.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. (4) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. (5) In November 2024, the Company sold an additional 11% interest in the joint venture. The Company retained a 60.01% ownership interest in the investment and recognized a $187.6 million gain in Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate. (6) In December 2024, following an assessment of the investment for recoverability, the Company recorded a charge of $72.6 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (7) In December 2023, following an assessment of the property and the investment for recoverability, the Company recorded a charge of $101.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, in February 2024, the joint venture settled the previously existing $182.5 million mortgage on the property for a net payment of $7.0 million. (8) In December 2024, following an assessment of the investment for recoverability, the Company recorded a charge of $20.4 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (9) In December 2024, following an assessment of the property for recoverability, the Company recognized a charge of $11.7 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (10) In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company. (11) In December 2024, following an assessment of the property and investment for recoverability, the Company recorded a charge of $12.0 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (12) In 2021, the Company admitted an additional partner to the development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets at December 31, 2024 and 2023. (13) The 25.1% economic interest reflected in this table excludes a 25.0% economic interest held by a third party. The third-party's economic interest is held in a joint venture that we consolidate as a 50.1% ownership interest. The third-party's 25.0% economic interest is recognized in Noncontrolling interests in other partnerships on our consolidated balance sheet. A separate third-party owns the remaining 49.9% economic interest in the property. (14) In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement. (15) In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest to a 90.43% ownership interest. See Note 5, "Debt and Preferred Equity Investments." In December 2023, together with its joint venture partner, the Company entered into a contract to sell the fee ownership in the property. In connection with this contract, the Company recorded a charge of $23.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. In connection with the sale, which closed in May 2024, the Company, together with its joint venture partner, originated a $235.4 million preferred equity investment in the property with a mandatory redemption date of December 2026. The Company's share, net of unamortized discounts, is $214.7 million with an aggregate weighted average current yield of 8.86% as of December 31, 2024. Disposition of Joint Venture Interests or Properties The following table summarizes the investments in unconsolidated joint ventures sold during the years ended December 31, 2024, 2023, and 2022: Property Ownership Interest Sold Disposition Date Gross Asset Valuation Gain (Loss) on Sale (in millions) (1) (2) One Vanderbilt Avenue 11.00% November 2024 $ 4,700.0 $ 187.6 625 Madison Avenue (3) 90.43% May 2024 634.6 (7.6) 717 Fifth Avenue 10.92% January 2024 963.0 26.9 21 East 66th Street 32.28% December 2023 40.6 (12.7) 121 Greene Street 50.00% February 2023 14.0 (0.3) Stonehenge Portfolio Various April 2022 1.0 — (1) Represents the Company's share of the gain or loss (2) For the years ended December 31, 2024 and December 31, 2023, the (losses) gains on sale are net of $16.8 million and $2.0 million, respectively, of employee compensation accrued in connection with the realization of the investment dispositions. There was no amount accrued for employee compensation in the year ended December 31, 2022. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) In connection with the sale of the fee ownership interest, the Company, together with its joint venture partner, originated a $235.4 million preferred equity investment in the property with a mandatory redemption date of December 2026. The Company's share, net of unamortized discounts, is $214.7 million with an aggregate weighted average current yield of 8.86% as of December 31, 2024. Prior to the completion of the sale, the Company recorded a charge of $5.9 million for capital contributions required during the three months ended March 31, 2024 while the investment was under contract, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations Joint Venture Mortgages and Other Loans Payable We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases as of December 31, 2024 and 2023, respectively, are as follows (dollars in thousands): Principal Outstanding Principal Outstanding Economic Current Maturity Final Maturity Interest December 31, 2024 December 31, 2023 Property Interest (1) Date Date (2) Rate (3) Gross SLG Share Gross SLG Share Fixed Rate Debt: 650 Fifth Avenue (4) 50.00 % February 2025 (5) July 2025 5.45% $ 65,000 $ 32,500 $ 65,000 $ 32,500 115 Spring Street (4) 51.00 % March 2025 March 2025 5.50% 65,550 33,431 65,550 33,431 450 Park Avenue 25.10 % June 2025 June 2027 6.10% 284,835 71,494 271,394 68,120 11 Madison Avenue 60.00 % September 2025 September 2025 3.84% 1,400,000 840,000 1,400,000 840,000 15 Beekman 20.00 % January 2026 January 2028 5.99% 120,000 24,000 — — 800 Third Avenue 60.52 % February 2026 February 2026 3.37% 177,000 107,120 177,000 107,120 1515 Broadway 56.87 % March 2026 March 2028 3.93% 740,947 421,369 762,002 433,344 919 Third Avenue 51.00 % April 2026 April 2028 6.11% 500,000 255,000 500,000 255,000 280 Park Avenue 50.00 % September 2026 September 2028 5.84% 1,075,000 537,500 — — 245 Park Avenue 50.10 % June 2027 June 2027 4.30% 1,768,000 885,768 1,768,000 885,768 One Madison Avenue (6) 25.50 % November 2027 November 2027 7.10% 658,357 167,881 733,103 186,941 Worldwide Plaza (4) 24.95 % November 2027 November 2027 3.98% 1,200,000 299,400 1,200,000 299,400 220 East 42nd Street 51.00 % December 2027 December 2027 6.77% 496,412 253,170 505,412 257,760 One Vanderbilt Avenue 60.01 % July 2031 July 2031 2.95% 3,000,000 1,800,300 3,000,000 2,130,300 5 Times Square (7) — — 477,783 150,740 625 Madison Avenue — — 199,987 180,848 10 East 53rd Street — — 220,000 121,000 717 Fifth Avenue — — 655,328 71,536 Total fixed rate debt $ 11,551,101 $ 5,728,933 $ 12,000,559 $ 6,053,808 Floating Rate Debt: 11 West 34th Street (4) 30.00 % February 2023 (8) February 2023 (8) L+ 1.45% $ 23,000 $ 6,900 $ 23,000 $ 6,900 1552 Broadway (4) 50.00 % February 2024 (9) February 2024 (9) S+ 2.75% 193,132 96,566 193,133 96,567 650 Fifth Avenue (4) 50.00 % February 2025 (5) July 2025 S+ 2.25% 210,000 105,000 210,000 105,000 One Madison Avenue (6) 25.50 % November 2027 November 2027 S+ 3.10% 354,757 90,463 — — 100 Park Avenue — — 360,000 179,640 5 Times Square (7) — — 610,010 192,458 280 Park Avenue — — 1,200,000 600,000 2 Herald Square — — 182,500 93,075 15 Beekman — — 124,137 24,827 Total floating rate debt $ 780,889 $ 298,929 $ 2,902,780 $ 1,298,467 Total joint venture mortgages and other loans payable $ 12,331,990 $ 6,027,862 $ 14,903,339 $ 7,352,275 Deferred financing costs, net (97,729) (49,058) (104,062) (54,865) Total joint venture mortgages and other loans payable, net $ 12,234,261 $ 5,978,804 $ 14,799,277 $ 7,297,410 (1) Economic interest represents the Company's interests in the joint venture as of December 31, 2024. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above. (2) Reflects exercise of all available extension options. The ability to exercise extension options may be subject to certain conditions, including the operating performance of the property. (3) Interest rates as of December 31, 2024, taking into account interest rate hedges at the joint venture. Corporate interest rate hedges are not taken into consideration. Floating rate debt is presented with the stated spread over Term SOFR ("S"). (4) Included in the Company's alternative strategy portfolio. (5) In February 2025, the maturity date of the loan was extended to July 2025. (6) The loan is a $1.25 billion construction facility, which was fully extended to November 2027. Advances under the loan are subject to costs incurred. In conjunction with the loan, the Company provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics. (7) In the fourth quarter of 2024, the Company recorded a $146.4 million charge, which is included in Equity in net loss from unconsolidated joint ventures. The Company no longer has an ownership interest in the property. (8) The Company's joint venture partner is in discussions with the lender on resolution of the past maturity. (9) The Company is in discussions with the lender on resolution of the past maturity. We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $21.9 million, $21.1 million and $24.0 million from these services, net of our ownership share of the joint ventures, for the years ended December 31, 2024, 2023, and 2022, respectively. In addition, we have the ability to earn incentive fees based on the ultimate financial performance of certain of the joint venture properties. The combined balance sheets for the unconsolidated joint ventures, as of December 31, 2024 and 2023, are as follows (in thousands): December 31, 2024 December 31, 2023 Assets (1) Commercial real estate property, net $ 15,327,542 $ 17,561,406 Cash and restricted cash 649,426 656,038 Tenant and other receivables, related party receivables, and deferred rents receivable 621,748 673,532 Debt and preferred equity investments, net 236,512 — Right-of-use assets 919,658 905,934 Other assets 1,739,549 2,584,765 Total assets $ 19,494,435 $ 22,381,675 Liabilities and equity (1) Mortgages and other loans payable, net $ 12,234,261 $ 14,799,277 Deferred revenue 956,217 1,108,180 Lease liabilities 1,008,085 990,276 Other liabilities 519,582 447,705 Equity 4,776,290 5,036,237 Total liabilities and equity $ 19,494,435 $ 22,381,675 Company's investments in unconsolidated joint ventures $ 2,690,138 $ 2,983,313 (1) As of December 31, 2024, $480.8 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences. The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the years ended December 31, 2024, 2023, and 2022 are as follows (unaudited, in thousands): Year Ended December 31, 2024 2023 2022 Total revenues $ 1,484,459 $ 1,525,044 $ 1,339,364 Operating expenses 259,558 253,630 240,002 Real estate taxes 297,520 287,462 252,806 Operating lease rent 33,207 29,048 26,152 Interest expense, net of interest income 573,148 574,032 431,865 Amortization of deferred financing costs 21,289 28,157 27,754 Depreciation and amortization 538,390 516,466 465,100 Total expenses $ 1,723,112 $ 1,688,795 $ 1,443,679 Gain (loss) on early extinguishment of debt 233,704 — (467) Depreciable real estate reserves and impairments (181,798) — — Net loss before gain (loss) on sale $ (186,747) $ (163,751) $ (104,782) Company's equity in net loss from unconsolidated joint ventures $ (179,695) $ (76,509) $ (57,958)

Deferred Costs

Deferred Costs	12 Months Ended
	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	Deferred Costs Deferred costs as of December 31, 2024 and 2023 consisted of the following (in thousands): December 31, 2024 December 31, 2023 Deferred leasing costs $ 426,055 $ 399,224 Less: accumulated amortization (308,923) (287,761) Deferred costs, net $ 117,132 $ 111,463

Mortgages and Other Loans Payab

Mortgages and Other Loans Payable	12 Months Ended
	Dec. 31, 2024
Mortgages and Other Loans Payable
Mortgages and Other Loans Payable	Mortgages and Other Loans Payable The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2024 and 2023, respectively, were as follows (dollars in thousands): Property Current Maturity Date Final Maturity Date (1) Interest Rate (2) December 31, 2024 December 31, 2023 Fixed Rate Debt: 10 East 53rd Street May 2025 May 2028 5.45% $ 205,000 $ — 100 Church Street June 2025 June 2027 5.89% 370,000 370,000 7 Dey / 185 Broadway November 2025 November 2026 6.65% 190,148 190,148 Landmark Square January 2027 January 2027 4.90% 100,000 100,000 485 Lexington Avenue February 2027 February 2027 4.25% 450,000 450,000 420 Lexington Avenue October 2040 October 2040 8.24% 272,326 277,238 Total fixed rate debt $ 1,587,474 $ 1,387,386 Floating Rate Debt: CMBS Repurchase Facility June 2025 June 2025 S+ 1.75% $ 3,550 $ — 100 Park Avenue June 2025 December 2027 S+ 2.25% 360,000 — 690 Madison Avenue — 60,000 719 Seventh Avenue — 50,000 Total floating rate debt $ 363,550 $ 110,000 Total mortgages and other loans payable $ 1,951,024 $ 1,497,386 Deferred financing costs, net of amortization (6,389) (6,067) Total mortgages and other loans payable, net $ 1,944,635 $ 1,491,319 (1) Reflects exercise of all available extension options. The ability to exercise extension options may be subject to certain conditions, including the operating performance of the property. (2) Interest rate as of December 31, 2024, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified. As of December 31, 2024 and 2023, the gross book value of the properties collateralizing the mortgages and other loans payable was approximately $2.2 billion and $1.9 billion, respectively. CMBS Securities Repurchase Facility In December 2024, the Company entered into a repurchase facility for CMBS securities (CMBS Repurchase Facility), which provides us with the ability to sell certain CMBS investments with a simultaneous agreement to repurchase the same at a certain date or on demand. We seek to mitigate risks associated with our repurchase facility by managing the credit quality of our assets, early repayments, interest rate volatility, liquidity, and market value. The margin call provisions under our repurchase facility permit valuation adjustments based on capital markets activity and are not limited to collateral-specific credit marks. To monitor credit risk associated with our CMBS investments, our asset management team regularly reviews our investment portfolio and is in contact with our borrowers in order to monitor the collateral and enforce our rights as necessary. The risk associated with potential margin calls is further mitigated by our ability to collateralize the facility with additional assets from our portfolio of investments, our ability to satisfy margin calls with cash or cash equivalents and our access to additional liquidity. As of December 31, 2024, there have been no margin calls on the CMBS Repurchase Facility. At December 31, 2024, the facility had an outstanding balance of $3.6 million. 2021 Credit Facility In December 2021, we entered into an amended and restated credit facility, referred to as the 2021 credit facility, that was previously amended by the Company in November 2017, and was originally entered into by the Company in November 2012. As of December 31, 2024, the 2021 credit facility consisted of a $1.25 billion revolving credit facility, a $1.05 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of May 15, 2026, May 15, 2027, and November 21, 2024, respectively. In November 2024, Term Loan B was paid down to $100 million and the maturity date was extended to November 19, 2025, with two additional six-month as-of-right extension options. The revolving credit facility has two six-month as-of-right extension options to May 15, 2027. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. As of December 31, 2024, the 2021 credit facility bore interest at a spread over adjusted Term SOFR plus 10 basis points with an interest period of one or three months, as we may elect, ranging from (i) 72.5 basis points to 140 basis points for loans under the revolving credit facility, (ii) 80 basis points to 160 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category. As of December 31, 2024, the applicable spread over adjusted Term SOFR plus 10 basis points for the 2021 credit facility was 140 basis points for the revolving credit facility, 160 basis points for Term Loan A, and 180 basis points for Term Loan B. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. As of December 31, 2024, the facility fee was 30 basis points. As of December 31, 2024, we had $7.5 million of outstanding letters of credit, $320.0 million drawn under the revolving credit facility and $1.15 billion of outstanding term loans, with total undrawn capacity of $922.5 million under the 2021 credit facility. As of December 31, 2024 and December 31, 2023, the revolving credit facility had a carrying value of $316.2 million and $554.8 million, respectively, net of deferred financing costs. As of December 31, 2024 and December 31, 2023, the term loans had a carrying value of $1.1 billion and $1.2 billion, respectively, net of deferred financing costs. The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility. The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below). Senior Unsecured Notes The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2024 and 2023, respectively, by scheduled maturity date (dollars in thousands): December 31, 2024 December 31, 2023 Issuance Unpaid Principal Balance Accreted Accreted Interest Rate (1) Initial Term Maturity Date December 17, 2015 (2) $ 100,000 $ 100,000 $ 100,000 4.27 % 10 December 2025 $ 100,000 $ 100,000 $ 100,000 Deferred financing costs, net — (103) (205) $ 100,000 $ 99,897 $ 99,795 (1) Interest rate as of December 31, 2024. (2) Issued by the Company and the Operating Partnership as co-obligors in a private placement. Restrictive Covenants The terms of the 2021 credit facility and our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of December 31, 2024 and 2023, we were in compliance with all such covenants. Junior Subordinated Deferrable Interest Debentures In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 26 basis points over the three-month Term SOFR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense. Principal Maturities Combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of December 31, 2024, including as-of-right extension options but excluding other extension options, were as follows (in thousands): Scheduled Principal Revolving Unsecured Term Loans Trust Senior Total Company's Share of Joint 2025 — 373,551 — — — 100,000 $ 473,551 1,198,400 2026 — 190,148 — 100,000 — — 290,148 936,639 2027 — 910,000 320,000 1,050,000 — — 2,280,000 1,710,229 2028 — 205,000 — — — — 205,000 382,294 2029 — — — — — — — — Thereafter — 272,325 — — 100,000 — 372,325 1,800,300 Total $ — $ 1,951,024 $ 320,000 $ 1,150,000 $ 100,000 $ 100,000 $ 3,621,024 $ 6,027,862 Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Year Ended December 31, 2024 2023 2022 Interest expense before capitalized interest $ 196,334 $ 228,840 $ 166,493 Interest on financing leases 4,502 4,446 4,555 Capitalized interest (50,148) (95,980) (82,444) Amortization of discount on assumed debt 494 2,842 1,855 Interest income (3,962) (3,034) (986) Interest expense, net $ 147,220 $ 137,114 $ 89,473

Corporate Indebtedness

Corporate Indebtedness	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Corporate Indebtedness	Mortgages and Other Loans Payable The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2024 and 2023, respectively, were as follows (dollars in thousands): Property Current Maturity Date Final Maturity Date (1) Interest Rate (2) December 31, 2024 December 31, 2023 Fixed Rate Debt: 10 East 53rd Street May 2025 May 2028 5.45% $ 205,000 $ — 100 Church Street June 2025 June 2027 5.89% 370,000 370,000 7 Dey / 185 Broadway November 2025 November 2026 6.65% 190,148 190,148 Landmark Square January 2027 January 2027 4.90% 100,000 100,000 485 Lexington Avenue February 2027 February 2027 4.25% 450,000 450,000 420 Lexington Avenue October 2040 October 2040 8.24% 272,326 277,238 Total fixed rate debt $ 1,587,474 $ 1,387,386 Floating Rate Debt: CMBS Repurchase Facility June 2025 June 2025 S+ 1.75% $ 3,550 $ — 100 Park Avenue June 2025 December 2027 S+ 2.25% 360,000 — 690 Madison Avenue — 60,000 719 Seventh Avenue — 50,000 Total floating rate debt $ 363,550 $ 110,000 Total mortgages and other loans payable $ 1,951,024 $ 1,497,386 Deferred financing costs, net of amortization (6,389) (6,067) Total mortgages and other loans payable, net $ 1,944,635 $ 1,491,319 (1) Reflects exercise of all available extension options. The ability to exercise extension options may be subject to certain conditions, including the operating performance of the property. (2) Interest rate as of December 31, 2024, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified. As of December 31, 2024 and 2023, the gross book value of the properties collateralizing the mortgages and other loans payable was approximately $2.2 billion and $1.9 billion, respectively. CMBS Securities Repurchase Facility In December 2024, the Company entered into a repurchase facility for CMBS securities (CMBS Repurchase Facility), which provides us with the ability to sell certain CMBS investments with a simultaneous agreement to repurchase the same at a certain date or on demand. We seek to mitigate risks associated with our repurchase facility by managing the credit quality of our assets, early repayments, interest rate volatility, liquidity, and market value. The margin call provisions under our repurchase facility permit valuation adjustments based on capital markets activity and are not limited to collateral-specific credit marks. To monitor credit risk associated with our CMBS investments, our asset management team regularly reviews our investment portfolio and is in contact with our borrowers in order to monitor the collateral and enforce our rights as necessary. The risk associated with potential margin calls is further mitigated by our ability to collateralize the facility with additional assets from our portfolio of investments, our ability to satisfy margin calls with cash or cash equivalents and our access to additional liquidity. As of December 31, 2024, there have been no margin calls on the CMBS Repurchase Facility. At December 31, 2024, the facility had an outstanding balance of $3.6 million. 2021 Credit Facility In December 2021, we entered into an amended and restated credit facility, referred to as the 2021 credit facility, that was previously amended by the Company in November 2017, and was originally entered into by the Company in November 2012. As of December 31, 2024, the 2021 credit facility consisted of a $1.25 billion revolving credit facility, a $1.05 billion term loan (or "Term Loan A"), and a $200.0 million term loan (or "Term Loan B") with maturity dates of May 15, 2026, May 15, 2027, and November 21, 2024, respectively. In November 2024, Term Loan B was paid down to $100 million and the maturity date was extended to November 19, 2025, with two additional six-month as-of-right extension options. The revolving credit facility has two six-month as-of-right extension options to May 15, 2027. We also have an option, subject to customary conditions, to increase the capacity of the credit facility to $4.5 billion at any time prior to the maturity dates for the revolving credit facility and term loans without the consent of existing lenders, by obtaining additional commitments from our existing lenders and other financial institutions. As of December 31, 2024, the 2021 credit facility bore interest at a spread over adjusted Term SOFR plus 10 basis points with an interest period of one or three months, as we may elect, ranging from (i) 72.5 basis points to 140 basis points for loans under the revolving credit facility, (ii) 80 basis points to 160 basis points for loans under Term Loan A, and (iii) 85 basis points to 165 basis points for loans under Term Loan B, in each case based on the credit rating assigned to the senior unsecured long term indebtedness of the Company. In instances where there are either only two ratings available or where there are more than two and the difference between them is one rating category, the applicable rating shall be the highest rating. In instances where there are more than two ratings and the difference between the highest and the lowest is two or more rating categories, then the applicable rating used is the average of the highest two, rounded down if the average is not a recognized category. As of December 31, 2024, the applicable spread over adjusted Term SOFR plus 10 basis points for the 2021 credit facility was 140 basis points for the revolving credit facility, 160 basis points for Term Loan A, and 180 basis points for Term Loan B. We are required to pay quarterly in arrears a 12.5 to 30 basis point facility fee on the total commitments under the revolving credit facility based on the credit rating assigned to the senior unsecured long-term indebtedness of the Company. As of December 31, 2024, the facility fee was 30 basis points. As of December 31, 2024, we had $7.5 million of outstanding letters of credit, $320.0 million drawn under the revolving credit facility and $1.15 billion of outstanding term loans, with total undrawn capacity of $922.5 million under the 2021 credit facility. As of December 31, 2024 and December 31, 2023, the revolving credit facility had a carrying value of $316.2 million and $554.8 million, respectively, net of deferred financing costs. As of December 31, 2024 and December 31, 2023, the term loans had a carrying value of $1.1 billion and $1.2 billion, respectively, net of deferred financing costs. The Company and the Operating Partnership are borrowers jointly and severally obligated under the 2021 credit facility. The 2021 credit facility includes certain restrictions and covenants (see Restrictive Covenants below). Senior Unsecured Notes The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2024 and 2023, respectively, by scheduled maturity date (dollars in thousands): December 31, 2024 December 31, 2023 Issuance Unpaid Principal Balance Accreted Accreted Interest Rate (1) Initial Term Maturity Date December 17, 2015 (2) $ 100,000 $ 100,000 $ 100,000 4.27 % 10 December 2025 $ 100,000 $ 100,000 $ 100,000 Deferred financing costs, net — (103) (205) $ 100,000 $ 99,897 $ 99,795 (1) Interest rate as of December 31, 2024. (2) Issued by the Company and the Operating Partnership as co-obligors in a private placement. Restrictive Covenants The terms of the 2021 credit facility and our senior unsecured notes include certain restrictions and covenants which may limit, among other things, our ability to pay dividends, make certain types of investments, incur additional indebtedness, incur liens and enter into negative pledge agreements and dispose of assets, and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value, a minimum ratio of EBITDA to fixed charges, a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value. The dividend restriction referred to above provides that, we will not during any time when a default is continuing, make distributions with respect to common stock or other equity interests, except to enable the Company to continue to qualify as a REIT for Federal income tax purposes. As of December 31, 2024 and 2023, we were in compliance with all such covenants. Junior Subordinated Deferrable Interest Debentures In June 2005, the Company and the Operating Partnership issued $100.0 million in unsecured trust preferred securities through a newly formed trust, SL Green Capital Trust I, or the Trust, which is a wholly owned subsidiary of the Operating Partnership. The securities mature in 2035 and bear interest at a floating rate of 26 basis points over the three-month Term SOFR. Interest payments may be deferred for a period of up to eight consecutive quarters if the Operating Partnership exercises its right to defer such payments. The Trust preferred securities are redeemable at the option of the Operating Partnership, in whole or in part, with no prepayment premium. We do not consolidate the Trust even though it is a variable interest entity as we are not the primary beneficiary. Because the Trust is not consolidated, we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense. Principal Maturities Combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of December 31, 2024, including as-of-right extension options but excluding other extension options, were as follows (in thousands): Scheduled Principal Revolving Unsecured Term Loans Trust Senior Total Company's Share of Joint 2025 — 373,551 — — — 100,000 $ 473,551 1,198,400 2026 — 190,148 — 100,000 — — 290,148 936,639 2027 — 910,000 320,000 1,050,000 — — 2,280,000 1,710,229 2028 — 205,000 — — — — 205,000 382,294 2029 — — — — — — — — Thereafter — 272,325 — — 100,000 — 372,325 1,800,300 Total $ — $ 1,951,024 $ 320,000 $ 1,150,000 $ 100,000 $ 100,000 $ 3,621,024 $ 6,027,862 Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Year Ended December 31, 2024 2023 2022 Interest expense before capitalized interest $ 196,334 $ 228,840 $ 166,493 Interest on financing leases 4,502 4,446 4,555 Capitalized interest (50,148) (95,980) (82,444) Amortization of discount on assumed debt 494 2,842 1,855 Interest income (3,962) (3,034) (986) Interest expense, net $ 147,220 $ 137,114 $ 89,473

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2024
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions One Vanderbilt Avenue Investment In December 2016, we entered into agreements with entities owned and controlled by our Chairman, Chief Executive Officer ("CEO") and Interim President, Marc Holliday, and our former President, Andrew Mathias, pursuant to which they agreed to make an investment in our One Vanderbilt project (inclusive of the property and SUMMIT One Vanderbilt) at the appraised fair market value for the interests acquired. This investment entitles these entities to receive a percentage of any profits realized by the Company from its One Vanderbilt project in excess of the Company's capital contributions, of approximately 1.27% and 0.85%, respectively, on account of the property and 1.92% and 1.28%, respectively, on account of SUMMIT One Vanderbilt. The entities had no right to any return of capital. Accordingly, subject to previously disclosed repurchase rights, these interests had no value and these entities were not entitled to any amounts (other than limited distributions to cover tax liabilities incurred) unless and until the Company received distributions from the One Vanderbilt project in excess of the Company's aggregate investment in the project. The entities owned and controlled by Messrs. Holliday and Mathias paid $1.4 million and $1.0 million, respectively, which equaled the fair market value of the interests acquired as of the date the investment agreements were entered into as determined by an independent third-party appraisal that we obtained. Messrs. Holliday and Mathias have the right to tender their interests in the project upon stabilization (50% within three years after stabilization and 100% three years or more after stabilization). In addition, the agreement calls for us to repurchase these interests in the event of a sale of One Vanderbilt or a transactional change of control of the Company. We also have the right to repurchase these interests on the seven-year anniversary of the stabilization of the project or upon the occurrence of certain separation events prior to the stabilization of the project relating to each of Messrs. Holliday's and Mathias's continued service with us. The price paid upon a tender of the interests will equal the liquidation value of the interests at the time, with the value based on the project's sale price, if applicable, or fair market value as determined by an independent third-party appraiser. In 2022, stabilization of the property (excluding SUMMIT One Vanderbilt) was achieved. Therefore, Messrs. Holiday and Mathias exercised their rights to tender 50% of their interests in the property (excluding SUMMIT One Vanderbilt) in July 2022. In 2023, stabilization of SUMMIT One Vanderbilt was achieved. As of December 31, 2024, Messrs. Holiday's and Mathias's remaining interests in the One Vanderbilt project are included in Preferred units and redeemable equity in the mezzanine equity section of the Company's consolidated financial statements. One Vanderbilt Avenue Leases In November 2018, we entered into a lease agreement with the One Vanderbilt Avenue joint venture covering certain floors at the property. In March 2021, the lease commenced and we relocated our corporate headquarters to the leased space. For the years ended December 31, 2024, 2023, and 2022 we recorded $3.0 million, $3.0 million, and $3.0 million, respectively, of rent expense under the lease. Additionally, in June 2021, we, through a consolidated subsidiary, entered into a lease agreement with the One Vanderbilt Avenue joint venture for SUMMIT One Vanderbilt, which commenced operations in October 2021. For the year ended December 31, 2024, we recorded $41.4 million of rent expense under the lease, including percentage rent, of which $27.7 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. For the year ended December 31, 2023, we recorded $38.9 million of rent expense under the lease, including percentage rent, of which $26.2 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. For the year ended December 31, 2022, we recorded $33.0 million of rent expense under the lease, including percentage rent, of which $22.8 million was recognized as income as a component of Equity in net loss from unconsolidated joint ventures in our consolidated statements of operations. See Note 20, "Commitments and Contingencies." 719 Seventh Avenue In April 2024, the Company entered into an arrangement to sell the property at 719 Seventh Avenue for $30.5 million to a special purpose entity ("SPE"), of which our former President and current director, Andrew Mathias, is a partner. No amounts from the transaction will be payable to Mr. Mathias. Mr. Mathias is initially expected to own up to 40% of the equity of the SPE, representing an investment by Mr. Mathias of up to approximately $7.0 million in the acquisition of the property. The transaction closed during the second quarter of 2024. See Note 4, "Properties Held for Sale and Property Dispositions." 760 Madison Avenue Condominium Unit In July 2024, the Company entered into an agreement to sell one of the condominium units located at 760 Madison Avenue to an entity owned by a trust of which the beneficiaries are the family members of our Chairman, CEO and Interim President, Marc Holliday, for $8.4 million. The transaction is expected to close in the first quarter of 2025. Other We receive fees for providing management, leasing, construction supervision, and asset management services to certain of our joint ventures as further described in Note 6, "Investments in Unconsolidated Joint Ventures." Amounts due from joint ventures, inclusive of our ownership share of the joint ventures, and related parties as of December 31, 2024 and 2023 consisted of the following (in thousands): December 31, 2024 December 31, 2023 Due from joint ventures $ 19,199 $ 10,603 Other 7,666 1,565 Related party receivables $ 26,865 $ 12,168

Noncontrolling Interests on the

Noncontrolling Interests on the Company's Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Noncontrolling Interests on the Company's Consolidated Financial Statements	Noncontrolling Interests on the Company's Consolidated Financial Statements Noncontrolling interests represent the common and preferred units of limited partnership interest in the Operating Partnership not held by the Company as well as third party equity interests in our other consolidated subsidiaries. Noncontrolling interests in the Operating Partnership are shown in the mezzanine equity while the noncontrolling interests in our other consolidated subsidiaries are shown in the equity section of the Company's consolidated financial statements. Common Units of Limited Partnership Interest in the Operating Partnership As of December 31, 2024 and 2023, the noncontrolling interest unit holders owned 5.97%, or 4,509,953 units, and 5.75%, or 3,949,448 units, of the Operating Partnership, respectively. As of December 31, 2024, 4,509,953 shares of our common stock were reserved for issuance upon the redemption of units of limited partnership interest of the Operating Partnership. Noncontrolling interests in the Operating Partnership is recorded at the greater of its cost basis or fair market value based on the closing stock price of our common stock at the end of the reporting period. Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the years ended December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Balance at beginning of period $ 238,051 $ 269,993 Distributions (13,915) (14,779) Issuance of common units 20,790 25,365 Redemption and conversion of common units (28,663) (18,589) Net income (loss) 497 (37,465) Accumulated other comprehensive income (loss) allocation 151 (1,960) Fair value adjustment 72,030 15,486 Balance at end of period $ 288,941 $ 238,051 Preferred Units of Limited Partnership Interest in the Operating Partnership Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of December 31, 2024: Issuance Stated Distribution Rate Number of Units Authorized Number of Units Issued Number of Units Outstanding Annual Dividend Per Unit (1) Liquidation Preference Per Unit (2) Conversion Price Per Unit (3) Date of Issuance Series A (4) 6.00 % 109,161 109,161 109,161 $ 60.0000 $ 1,000.00 $ — August 2015 Series F 7.00 % 60 60 60 70.0000 1,000.00 29.12 January 2007 Series K 3.50 % 700,000 563,954 341,677 0.8750 25.00 134.67 August 2014 Series L 4.00 % 500,000 378,634 272,783 1.0000 25.00 — August 2014 Series R 3.50 % 400,000 400,000 400,000 0.8750 25.00 154.89 August 2015 Series S 4.00 % 1,077,280 1,077,280 1,077,280 1.0000 25.00 — August 2015 Series V (5) 5.00 % 40,000 40,000 40,000 1.2500 25.00 — May 2019 Series W (6) (6) 1 1 1 (6) (6) (6) January 2020 (1) Dividends are cumulative, subject to certain provisions. (2) Units are redeemable at any time at par for cash at the option of the unit holder unless otherwise specified. (3) If applicable, units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) the amount shown in the table. (4) Issued through a consolidated subsidiary. The units are redeemable at any time after December 13, 2024 at par for cash at the option of the unit holder. (5) The Series V Preferred Units are redeemable at any time after January 1, 2025 at par for cash at the option of the unit holder. (6) The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event. Below is a summary of the activity relating to the preferred units in the Operating Partnership for the years ended December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Balance at beginning of period $ 166,501 $ 177,943 Issuance of preferred units — — Redemption of preferred 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

Stockholders' Equity of the Com

Stockholders' Equity of the Company	12 Months Ended
	Dec. 31, 2024
Stockholders' Equity Note [Abstract]
Stockholders' Equity of the Company	Stockholders' Equity of the Company Common Stock Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of December 31, 2024, 71,096,743 shares of common stock and no shares of excess stock were issued and outstanding. In November 2024, the Company completed an offering of 5,063,291 shares of its common stock, par value $0.01 per share, at a price of $79.00 per share. The Company received net proceeds of approximately $386.3 million, after deducting offering expenses. The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 5,063,291 common units of limited partnership interest and were used to repay debt, fund new investments and for other corporate purposes. Share Repurchase Program Our Board of Directors approved a $3.5 billion share repurchase program under which we can buy shares of our common stock. As of December 31, 2024, 36,107,719 shares have been repurchased under the program, excluding the redemption of OP units. We did not repurchase any shares under the program during the year ended December 31, 2024. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at any time, in whole or from time to time in part, at par for cash. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan ("DRSPP") In February 2024, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of our common stock under the DRSPP. The DRSPP commenced on September 24, 2001. The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2024, 2023, and 2022, respectively (dollars in thousands): Year Ended December 31, 2024 2023 2022 Shares of common stock issued 728,352 17,180 10,839 Dividend reinvestments/stock purchases under the DRSPP $ 52,308 $ 525 $ 525 Earnings per Share We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity. SL Green's earnings per share for the years ended December 31, 2024, 2023, and 2022 are computed as follows (in thousands): Year Ended December 31, Numerator 2024 2023 2022 Basic Earnings: Income (loss) attributable to SL Green common stockholders $ 7,060 $ (579,509) $ (93,024) Less: distributed earnings allocated to participating securities (1,835) (2,655) (2,219) Less: undistributed earnings allocated to participating securities (64) — — Net income (loss) attributable to SL Green common stockholders (numerator for basic earnings per share) $ 5,161 $ (582,164) $ (95,243) Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares — — — Add back: undistributed earnings allocated to participating securities — — — Add back: effect of dilutive securities (redemption of units to common shares) — (37,465) (5,794) Income (loss) attributable to SL Green common stockholders (numerator for diluted earnings per share) $ 5,161 $ (619,629) $ (101,037) Year Ended December 31, Denominator 2024 2023 2022 Basic Shares: Weighted average common stock outstanding 65,062 63,809 63,917 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares — 4,163 4,012 Stock-based compensation plans 626 — — Diluted weighted average common stock outstanding 65,688 67,972 67,929 The Company has excluded 4,717,759 common stock equivalents from the calculation of diluted shares outstanding for the year ended December 31, 2024. The Company has excluded 1,273,417 and 1,682,236 of common stock equivalents from the calculation of diluted shares outstanding for the years ended December 31, 2023 and 2022, respectively. The Company is the sole managing general partner of the Operating Partnership and as of December 31, 2024 owned 71,096,743 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units. Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions. Limited Partner Units As of December 31, 2024, limited partners other than SL Green owned 5.97%, or 4,509,953 common units, of the Operating Partnership. Preferred Units Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.” Earnings per Unit The Operating Partnership's earnings per unit for the years ended December 31, 2024, 2023, and 2022 respectively are computed as follows (in thousands): Year Ended December 31, Numerator 2024 2023 2022 Basic Earnings: Net Income (loss) attributable to SLGOP common unitholders (numerator for diluted earnings per unit) $ 7,557 $ (616,974) $ (98,818) Less: distributed earnings allocated to participating securities (4,665) (2,655) (2,219) Net income (loss) attributable to SLGOP common unitholders (numerator for basic earnings per unit) $ 2,892 $ (619,629) $ (101,037) Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 26 — — Income (loss) attributable to SLGOP common unitholders $ 2,918 $ (619,629) $ (101,037) Year Ended December 31, Denominator 2024 2023 2022 Basic units: Weighted average common units outstanding 68,736 67,972 67,929 Effect of Dilutive Securities: Stock-based compensation plans 757 — — Contingently issuable units 112 — — Diluted weighted average common units outstanding 69,605 67,972 67,929 The Operating Partnership has excluded 800,881 common unit equivalents from the diluted units outstanding for the years ended December 31, 2024. The Operating Partnership has excluded 1,273,417 and 1,682,236 common unit equivalents from the diluted units outstanding for the years ended December 31, 2023 and 2022, respectively.

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Partners' Capital of the Operating Partnership	Stockholders' Equity of the Company Common Stock Our authorized capital stock consists of 260,000,000 shares, $0.01 par value per share, consisting of 160,000,000 shares of common stock, $0.01 par value per share, 75,000,000 shares of excess stock, at $0.01 par value per share, and 25,000,000 shares of preferred stock, par value $0.01 per share. As of December 31, 2024, 71,096,743 shares of common stock and no shares of excess stock were issued and outstanding. In November 2024, the Company completed an offering of 5,063,291 shares of its common stock, par value $0.01 per share, at a price of $79.00 per share. The Company received net proceeds of approximately $386.3 million, after deducting offering expenses. The net proceeds from these offerings were contributed to the Operating Partnership in exchange for 5,063,291 common units of limited partnership interest and were used to repay debt, fund new investments and for other corporate purposes. Share Repurchase Program Our Board of Directors approved a $3.5 billion share repurchase program under which we can buy shares of our common stock. As of December 31, 2024, 36,107,719 shares have been repurchased under the program, excluding the redemption of OP units. We did not repurchase any shares under the program during the year ended December 31, 2024. Perpetual Preferred Stock We have 9,200,000 shares of our 6.50% Series I Cumulative Redeemable Preferred Stock, or the Series I Preferred Stock, outstanding with a mandatory liquidation preference of $25.00 per share. The Series I Preferred stockholders receive annual dividends of $1.625 per share paid on a quarterly basis and dividends are cumulative, subject to certain provisions. We are entitled to redeem the Series I Preferred Stock at any time, in whole or from time to time in part, at par for cash. In August 2012, we received $221.9 million in net proceeds from the issuance of the Series I Preferred Stock, which were recorded net of underwriters' discount and issuance costs, and contributed the net proceeds to the Operating Partnership in exchange for 9,200,000 units of 6.50% Series I Cumulative Redeemable Preferred Units of limited partnership interest, or the Series I Preferred Units. Dividend Reinvestment and Stock Purchase Plan ("DRSPP") In February 2024, the Company filed a registration statement with the SEC for our dividend reinvestment and stock purchase plan, or DRSPP, which automatically became effective upon filing. The Company registered 3,500,000 shares of our common stock under the DRSPP. The DRSPP commenced on September 24, 2001. The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2024, 2023, and 2022, respectively (dollars in thousands): Year Ended December 31, 2024 2023 2022 Shares of common stock issued 728,352 17,180 10,839 Dividend reinvestments/stock purchases under the DRSPP $ 52,308 $ 525 $ 525 Earnings per Share We use the two-class method of computing earnings per share (“EPS”), which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur from share equivalent activity. SL Green's earnings per share for the years ended December 31, 2024, 2023, and 2022 are computed as follows (in thousands): Year Ended December 31, Numerator 2024 2023 2022 Basic Earnings: Income (loss) attributable to SL Green common stockholders $ 7,060 $ (579,509) $ (93,024) Less: distributed earnings allocated to participating securities (1,835) (2,655) (2,219) Less: undistributed earnings allocated to participating securities (64) — — Net income (loss) attributable to SL Green common stockholders (numerator for basic earnings per share) $ 5,161 $ (582,164) $ (95,243) Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares — — — Add back: undistributed earnings allocated to participating securities — — — Add back: effect of dilutive securities (redemption of units to common shares) — (37,465) (5,794) Income (loss) attributable to SL Green common stockholders (numerator for diluted earnings per share) $ 5,161 $ (619,629) $ (101,037) Year Ended December 31, Denominator 2024 2023 2022 Basic Shares: Weighted average common stock outstanding 65,062 63,809 63,917 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares — 4,163 4,012 Stock-based compensation plans 626 — — Diluted weighted average common stock outstanding 65,688 67,972 67,929 The Company has excluded 4,717,759 common stock equivalents from the calculation of diluted shares outstanding for the year ended December 31, 2024. The Company has excluded 1,273,417 and 1,682,236 of common stock equivalents from the calculation of diluted shares outstanding for the years ended December 31, 2023 and 2022, respectively. The Company is the sole managing general partner of the Operating Partnership and as of December 31, 2024 owned 71,096,743 general and limited partnership interests in the Operating Partnership and 9,200,000 Series I Preferred Units. Partnership interests in the Operating Partnership are denominated as “common units of limited partnership interest” (also referred to as “OP Units”) or “preferred units of limited partnership interest” (also referred to as “Preferred Units”). All references to OP Units and Preferred Units outstanding exclude such units held by the Company. A holder of an OP Unit may present such OP Unit to the Operating Partnership for redemption at any time (subject to restrictions agreed upon at the issuance of OP Units to particular holders that may restrict such right for a period of time, generally one year from issuance). Upon presentation of an OP Unit for redemption, the Operating Partnership must redeem such OP Unit in exchange for the cash equal to the then value of a share of common stock of the Company, except that the Company may, at its election, in lieu of cash redemption, acquire such OP Unit for one share of common stock. Because the number of shares of common stock outstanding at all times equals the number of OP Units that the Company owns, one share of common stock is generally the economic equivalent of one OP Unit, and the quarterly distribution that may be paid to the holder of an OP Unit equals the quarterly dividend that may be paid to the holder of a share of common stock. Each series of Preferred Units makes a distribution that is set in accordance with an amendment to the partnership agreement of the Operating Partnership. Preferred Units may also be convertible into OP Units at the election of the holder thereof or the Company, subject to the terms of such Preferred Units. Net income (loss) allocated to the preferred unitholders and common unitholders reflects their pro rata share of net income (loss) and distributions. Limited Partner Units As of December 31, 2024, limited partners other than SL Green owned 5.97%, or 4,509,953 common units, of the Operating Partnership. Preferred Units Preferred units not owned by SL Green are further described in Note 11, “Noncontrolling Interests on the Company's Consolidated Financial Statements - Preferred Units of Limited Partnership Interest in the Operating Partnership.” Earnings per Unit The Operating Partnership's earnings per unit for the years ended December 31, 2024, 2023, and 2022 respectively are computed as follows (in thousands): Year Ended December 31, Numerator 2024 2023 2022 Basic Earnings: Net Income (loss) attributable to SLGOP common unitholders (numerator for diluted earnings per unit) $ 7,557 $ (616,974) $ (98,818) Less: distributed earnings allocated to participating securities (4,665) (2,655) (2,219) Net income (loss) attributable to SLGOP common unitholders (numerator for basic earnings per unit) $ 2,892 $ (619,629) $ (101,037) Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 26 — — Income (loss) attributable to SLGOP common unitholders $ 2,918 $ (619,629) $ (101,037) Year Ended December 31, Denominator 2024 2023 2022 Basic units: Weighted average common units outstanding 68,736 67,972 67,929 Effect of Dilutive Securities: Stock-based compensation plans 757 — — Contingently issuable units 112 — — Diluted weighted average common units outstanding 69,605 67,972 67,929 The Operating Partnership has excluded 800,881 common unit equivalents from the diluted units outstanding for the years ended December 31, 2024. The Operating Partnership has excluded 1,273,417 and 1,682,236 common unit equivalents from the diluted units outstanding for the years ended December 31, 2023 and 2022, respectively.

Share-based Compensation

Share-based Compensation	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Share-based Compensation	Share-based Compensation We have share-based employee and director compensation plans. Our employees are compensated through the Operating Partnership. Under each plan, whenever the Company issues common or preferred stock, the Operating Partnership issues an equivalent number of units of limited partnership interest of a corresponding class to the Company. The Fifth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's Board of Directors in April 2022 and its stockholders in June 2022 at the Company's annual meeting of stockholders. The 2005 Plan authorizes the issuance of stock options, stock appreciation rights, unrestricted and restricted stock, phantom shares, dividend equivalent rights, cash-based awards and other equity-based awards. Subject to adjustments upon certain corporate transactions or events, awards with respect to up to a maximum of 32,210,000 fungible units may be granted under the 2005 Plan. Currently, different types of awards count against the limit on the number of fungible units differently, with (1) full-value awards (i.e., those that deliver the full value of the award upon vesting, such as restricted stock) counting as 2.59 Fungible Units per share subject to such awards, (2) stock options, stock appreciation rights and other awards that do not deliver full value and expire five years from the date of grant counting as 0.84 fungible units per share subject to such awards, and (3) all other awards (e.g., 10-year stock options) counting as 1.0 fungible units per share subject to such awards. Awards granted under the 2005 Plan prior to the approval of the fifth amendment and restatement in June 2022 continue to count against the fungible unit limit based on the ratios that were in effect at the time such awards were granted, which may be different than the current ratios. As a result, depending on the types of awards issued, the 2005 Plan may result in the issuance of more or less than 32,210,000 shares. If a stock option or other award granted under the 2005 Plan expires or terminates, the common stock subject to any portion of the award that expires or terminates without having been exercised or paid, as the case may be, will again become available for the issuance of additional awards. Shares of our common stock distributed under the 2005 Plan may be treasury shares or authorized but unissued shares. Currently, unless the 2005 Plan has been previously terminated by the Company's Board of Directors, new awards may be granted under the 2005 Plan until June 1, 2032, which is the tenth anniversary of the date that the 2005 Plan was most recently approved by the Company's stockholders. As of December 31, 2024, 1.5 million fungible units were available for issuance under the 2005 Plan after reserving for shares underlying outstanding restricted stock units, phantom stock units granted pursuant to our Non-Employee Directors' Deferral Program and LTIP Units. Stock Options and Class O LTIP Units Options are granted with an exercise price at the fair market value of the Company's common stock on the date of grant and, subject to employment, generally expire five years or ten years from the date of grant, are not transferable other than on death, and generally vest in one year to five years commencing one year from the date of grant. We have also granted Class O LTIP Units, which are a class of LTIP Units in the Operating Partnership structured to provide economics similar to those of stock options. Class O LTIP Units, once vested, may be converted, at the election of the holder, into a number of common units of the Operating Partnership per Class O LTIP Unit determined by the increase in value of a share of the Company's common stock at the time of conversion over a participation threshold, which equals the fair market value of a share of the Company's common stock at the time of grant. Class O LTIP Units are entitled to distributions, subject to vesting, equal per unit to 10% of the per unit distributions paid with respect to the common units of the Operating Partnership. In December 2024, our Chairman, CEO and Interim President, Marc Holliday, received a grant of 217,917 Class O LTIP Units, in connection with his new employment agreement, that are subject to both time-based vesting conditions and performance-based vesting conditions. The performance-based vesting conditions are satisfied if the average share price of the Company's common stock equals or exceeds $100.00 as of any trailing twenty trading day period between the grant date and the fifth anniversary thereafter. Subject to achievement of the performance hurdle and continued employment, the Class O LTIP Units vest ratably on December 31, 2025, December 31, 2026, and December 31, 2027. The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the year ended December 31, 2024 (there were no options granted during the years ended December 31, 2023 and 2022). 2024 2023 2022 Dividend yield 5.5 % N/A N/A Expected life 7.5 years N/A N/A Risk-free interest rate 4.45 % N/A N/A Expected stock price volatility 45.0 % N/A N/A A summary of the status of the Company's stock options as of December 31, 2024, 2023, and 2022 and changes during the years ended December 31, 2024, 2023, and 2022 are as follows: Year Ended December 31, 2024 2023 2022 Options Outstanding Weighted Average Options Outstanding Weighted Average Options Weighted Balance at beginning of year 115,980 $ 103.52 313,480 $ 97.59 394,089 $ 100.56 Granted 217,917 68.07 — — — — Lapsed or canceled — — (197,500) 84.14 (80,609) 112.14 Balance at end of year 333,897 $ 81.63 115,980 $ 103.52 313,480 $ 97.59 Options exercisable at end of year 115,980 $ 103.52 115,980 $ 103.52 313,480 $ 97.59 The remaining weighted average contractual life of the options outstanding was 6.9 years and the remaining average contractual life of the options exercisable was 2.0 years. During the years ended December 31, 2024, 2023, and 2022, we recognized no compensation expense related to options. As of December 31, 2024, there was $4.5 million unrecognized compensation cost related to unvested stock options. Restricted Shares Shares may be granted to certain employees, including our executives, and vesting occurs upon the completion of a service period or our meeting established financial performance criteria. Vesting occurs at rates ranging from 15% to 35% once performance criteria are reached. A summary of the Company's restricted stock as of December 31, 2024, 2023, and 2022 and changes during the years ended December 31, 2024, 2023, and 2022 are as follows: Year Ended December 31, 2024 2023 2022 Balance at beginning of year 4,089,174 3,758,174 3,459,363 Granted 371,285 337,350 314,995 Canceled (10,750) (6,350) (16,184) Balance at end of year 4,449,709 4,089,174 3,758,174 Vested during the year 143,453 147,915 118,255 Compensation expense recorded $ 10,939,602 $ 7,766,055 $ 10,133,905 Total fair value of restricted stock granted during the year $ 24,676,422 $ 15,789,540 $ 16,804,931 The fair value of restricted stock that vested during the years ended December 31, 2024, 2023, and 2022 was $7.4 million, $10.2 million and $9.7 million, respectively. As of December 31, 2024, there was $33.3 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 2.3 years. We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $34.1 million and $38.1 million during the years ended December 31, 2024 and 2023, respectively. The grant date fair value of the LTIP Unit awards was calculated in accordance with ASC 718. A third-party consultant determined that the fair value of the LTIP Units has a discount to our common stock price. The discount was calculated by considering the inherent uncertainty that the LTIP Units will reach parity with other common partnership units and the illiquidity due to transfer restrictions. As of December 31, 2024, there was $31.0 million of total unrecognized compensation expense related to the time-based and performance-based awards, which is expected to be recognized over a weighted average period of 1.7 years. During the years ended December 31, 2024, 2023, and 2022, we recorded compensation expense related to bonus, time-based and performance-based awards of $30.5 million, $50.4 million, and $43.5 million, respectively. For the years ended December 31, 2024, 2023, and 2022, $1.7 million, $1.4 million, and $1.8 million, respectively, was capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options. Deferred Compensation Plan for Directors Under our Non-Employee Director's Deferral Program, which commenced July 2004, the Company's non-employee directors may elect to defer up to 100% of their annual retainer fee, chairman fees, meeting fees and annual stock grant. Unless otherwise elected by a participant, fees deferred under the program shall be credited in the form of phantom stock units. The program provides that a director's phantom stock units generally will be settled in an equal number of shares of common stock upon the earlier of (i) the January 1 coincident with or the next following such director's termination of service from the Board of Directors or (ii) a change in control by us, as defined by the program. Phantom stock units are credited to each non-employee director quarterly using the closing price of our common stock on the first business day of the respective quarter. Each participating non-employee director is also credited with dividend equivalents or phantom stock units based on the dividend rate for each quarter, which are either paid in cash currently or credited to the director's account as additional phantom stock units. During the year ended December 31, 2024, 15,945 phantom stock units and 25,590 shares of common stock were issued to our Board of Directors. We recorded compensation expense of $2.8 million during the year ended December 31, 2024 related to the Deferred Compensation Plan. As of December 31, 2024, there were 125,654 phantom stock units outstanding pursuant to our Non-Employee Director's Deferral Program. Employee Stock Purchase Plan In 2007, the Company's Board of Directors adopted the 2008 Employee Stock Purchase Plan, or ESPP, to provide equity-based incentives to eligible employees. The ESPP is intended to qualify as an "employee stock purchase plan" under Section 423 of the Code, and has been adopted by the board to enable our eligible employees to purchase the Company's shares of common stock through payroll deductions. The ESPP became effective on January 1, 2008 with a maximum of 500,000 shares of the common stock available for issuance, subject to adjustment upon a merger, reorganization, stock split or other similar corporate change. The Company filed a registration statement on Form S-8 with the SEC with respect to the ESPP. The common stock is offered for purchase through a series of successive offering periods. Each offering period will be three months in duration and will begin on the first day of each calendar quarter, with the first offering period having commenced on January 1, 2008. The ESPP provides for eligible employees to purchase the common stock at a purchase price equal to 85% of the lesser of (1) the market value of the common stock on the first day of the offering period or (2) the market value of the common stock on the last day of the offering period. The ESPP was approved by our stockholders at our 2008 annual meeting of stockholders. As of December 31, 2024, 245,445 shares of our common stock had been issued under the ESPP.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following tables set forth the changes in accumulated other comprehensive income by component as of December 31, 2024, 2023 and 2022 (in thousands): Net unrealized gain (loss) on derivative instruments ( 1 ) SL Green's share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Net unrealized (loss) gain on marketable securities Total Balance at December 31, 2021 $ (25,881) $ (21,994) $ 1,117 $ (46,758) Other comprehensive income (loss) before reclassifications 78,300 23,405 (1,359) 100,346 Amounts reclassified from accumulated other comprehensive income (4,619) 635 — (3,984) Balance at December 31, 2022 47,800 2,046 (242) 49,604 Other comprehensive (loss) income before reclassifications 17,269 6,950 (1,549) 22,670 Amounts reclassified from accumulated other comprehensive income (39,717) (15,080) — (54,797) Balance at December 31, 2023 25,352 (6,084) (1,791) 17,477 Other comprehensive income before reclassifications 39,049 6,515 525 46,089 Amounts reclassified from accumulated other comprehensive income (35,071) (10,299) — (45,370) Balance at December 31, 2024 $ 29,330 $ (9,868) $ (1,266) $ 18,196 (1) Amount reclassified from accumulated other comprehensive income is included in interest expense in the respective consolidated statements of operations. As of December 31, 2024 and 2023, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive income relating to net unrealized gain (loss) on derivative instruments, was ($0.2 million) and ($0.4 million), respectively. (2) Amount reclassified from accumulated other comprehensive income is included in equity in net loss from unconsolidated joint ventures in the respective consolidated statements of operations.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We are required to disclose fair value information with regard to certain of our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of certain financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity's own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy as of December 31, 2024 and 2023 (in thousands): December 31, 2024 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 17,323 $ — $ 17,323 $ — Interest rate cap and swap agreements (included in Other assets) $ 31,860 $ — $ 31,860 $ — Real estate loans held by consolidated securitization vehicles $ 584,134 $ 584,134 Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 6,469 $ — $ 6,469 $ — Senior obligations of consolidated securitization vehicles $ 567,487 $ 567,487 Secured borrowing (1) $ 251,096 $ 251,096 (1) The Company admitted an additional partner to the One Madison Avenue development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets. December 31, 2023 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 9,591 $ — $ 9,591 $ — Interest rate cap and swap agreements (included in Other assets) $ 33,456 $ — $ 33,456 $ — Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 17,108 $ — $ 17,108 $ — We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts, all of which are classified as Level 3 inputs. In December 2024, the Company amended the joint venture agreement with its partner in the 100 Park Avenue joint venture. As a result of the amended terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a positive fair value adjustment of $117.8 million, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to December 2024, the investment was accounted for under the equity method. This fair value was determined using a third-party valuation which primarily utilized cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as the sales comparison approach, which utilizes comparable sales, listings, and sales contracts. All of which are classified as Level 3 inputs. In March 2024, the Company entered into an agreement to acquire its partner's 45.0% interest in the 10 East 53rd Street joint venture. As a result of the contract terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a negative fair value adjustment of ($55.7 million), which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to March 2024, the investment was accounted for under the equity method. This fair value was determined using a third-party valuation which primarily utilized cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as the sales comparison approach, which utilizes comparable sales, listings, and sales contracts. All of which are classified as Level 3 inputs. In June 2023, the Company sold a 49.9% interest in its 245 Park Avenue investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement. Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The senior obligations of consolidated securitization vehicles represent CMBS that are not owned by the Company. A majority of these securities are either traded in the marketplace or are similar to other securities that are traded in the marketplace. As the valuation of these amounts are based upon quoted prices for similar instruments in active markets, we generally utilize third party pricing service providers to determine the fair value. The Company evaluates and assesses the third party pricing by referring to recent trades of similar securities, ratings, subordination levels, current market data and credit issues. The Company maximizes the use of observable inputs over unobservable inputs and uses the value of the senior obligations of consolidated securitization vehicles as an indicator of the fair value of the real estate loans held by consolidated securitization vehicles. Depending on the significance of the fair value inputs used in determining the fair value, these securities are classified in either Level 2 or Level 3 of the fair value hierarchy. As such, these investments may move between Level 2 and Level 3 of the fair value hierarchy if the significant fair value inputs used to price the CMBS become or cease to be observable. The fair value of our secured borrowing is determined by projecting future cash flows, which takes into consideration various factors including discount rate and exit capitalization rate, as well as related asset performance and local or macro real estate performance. The inputs used in determining the Company's secured borrowing are considered Level 3. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short-term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist. The following table provides the carrying value and fair value of these financial instruments as of December 31, 2024 and December 31, 2023 (in thousands): December 31, 2024 December 31, 2023 Carrying Value (1) Fair Value Carrying Value (1) Fair Value Debt and preferred equity investments $ 303,726 (2) $ 346,745 (2) Fixed rate debt $ 3,257,474 $ 3,225,767 $ 3,237,386 $ 3,184,338 Variable rate debt (3) 363,550 355,364 270,000 268,787 Total debt $ 3,621,024 $ 3,581,131 $ 3,507,386 $ 3,453,125 (1) Amounts exclude net deferred financing costs. (2) As of December 31, 2024, debt and preferred equity investments had an estimated fair value of approximately $0.3 billion. As of December 31, 2023, debt and preferred equity investments had an estimated fair value of approximately $0.3 billion. Disclosures regarding fair value of financial instruments was based on pertinent information available to us as of December 31, 2024 and 2023. Such amounts have not been comprehensively revalued for purposes of these financial statements since that date and current estimates of fair value may differ significantly from the amounts presented herein.

Financial Instruments_ Derivati

Financial Instruments: Derivatives and Hedging	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments: Derivatives and Hedging	Financial Instruments: Derivatives and Hedging In the normal course of business, we use a variety of commonly used derivative instruments, including, but not limited to, interest rate swaps, caps, collars and floors, to manage interest rate risk. We hedge our exposure to variability in future cash flows for forecasted transactions in addition to anticipated future interest payments on existing debt. We recognize all derivatives on the balance sheet at fair value. Derivatives that are not hedges are adjusted to fair value through earnings. If a derivative is a hedge, depending on the nature of the hedge, changes in the fair value of the derivative will either be offset against the change in fair value of the hedge asset, liability, or firm commitment through earnings, or recognized in other comprehensive income (loss) until the hedged item is recognized in earnings. Reported net income and equity may increase or decrease prospectively, depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items, but will have no effect on cash flows. Currently, all of our designated derivative instruments are effective hedging instruments. The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments as of December 31, 2024 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands). Notional Strike Effective Expiration Balance Sheet Location Fair Interest Rate Cap 205,000 4.000 % February 2024 February 2025 Other Assets $ 75 Interest Rate Cap 370,000 3.250 % June 2024 June 2025 Other Assets 1,653 Interest Rate Cap 370,000 3.250 % June 2024 June 2025 Other Liabilities (1,649) Interest Rate Cap 68,678 4.000 % August 2024 July 2025 Other Liabilities (102) Interest Rate Swap 150,000 2.621 % December 2021 January 2026 Other Assets 2,196 Interest Rate Swap 200,000 2.662 % December 2021 January 2026 Other Assets 2,849 Interest Rate Swap 125,000 3.667 % August 2024 December 2026 Other Assets 828 Interest Rate Swap 125,000 3.670 % August 2024 December 2026 Other Assets 820 Interest Rate Swap 100,000 2.903 % February 2023 February 2027 Other Assets 2,225 Interest Rate Swap 100,000 2.733 % February 2023 February 2027 Other Assets 2,568 Interest Rate Swap 50,000 2.463 % February 2023 February 2027 Other Assets 1,557 Interest Rate Swap 200,000 2.591 % February 2023 February 2027 Other Assets 5,711 Interest Rate Swap 300,000 2.866 % July 2023 May 2027 Other Assets 7,637 Interest Rate Swap 150,000 3.524 % January 2024 May 2027 Other Assets 1,618 Interest Rate Swap 370,000 3.888 % November 2022 June 2027 Other Assets 970 Interest Rate Swap 68,678 4.466 % August 2024 June 2027 Other Liabilities (765) Interest Rate Swap 300,000 4.487 % November 2024 November 2027 Other Liabilities (3,953) Interest Rate Swap 100,000 3.756 % January 2023 January 2028 Other Assets 722 Interest Rate Swap 204,963 3.915 % February 2025 May 2028 Other Assets 431 $ 25,391 During the year ended December 31, 2024, we recorded a gain of $5.5 million based on the changes in the fair value of forward-starting interest rate swaps, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. During the year ended December 31, 2023, we recorded a loss of $10.4 million based on the changes in the fair value of an interest rate cap we sold and a forward-starting interest rate swap. During the year ended December 31, 2022, we recorded a loss of $1.7 million based on the changes in the fair value of an interest rate cap we sold. During the year ended December 31, 2024, we recorded a gain of $0.1 million, on the changes in fair value, which is included in interest expenses in the consolidated statements of operations. During the years ended December 31, 2023 and 2022, we recorded losses of $0.2 million and $0.3 million, respectively, on the changes in the fair value, which is included in interest expense in the consolidated statements of operations. Certain agreements the Company has with each of its derivative counterparties contain a provision where if the Company defaults on any of its indebtedness, then the Company could also be declared in default on its derivative obligations. As of December 31, 2024, the fair value of derivatives in a net liability position, including accrued interest but excluding any adjustment for nonperformance risk related to these agreements was $6.7 million. As of December 31, 2024, the Company was not required to post any collateral related to these agreements and was not in breach of any agreement provisions. If the Company had breached any of these provisions, it could have been required to settle its obligations under the agreements at their aggregate termination value of $6.8 million as of December 31, 2024. Gains and losses on terminated hedges are included in accumulated other comprehensive income, and are recognized into earnings over the term of the related obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive income will be reclassified into earnings as an adjustment to interest expense in the same periods in which the hedged interest payments affect earnings. We estimate that ($18.4 million) of the current balance held in accumulated other comprehensive income will be reclassified into interest expense and ($1.7 million) of the portion related to our share of joint venture accumulated other comprehensive income will be reclassified into equity in net loss from unconsolidated joint ventures within the next 12 months. The following table presents the effects of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the years ended December 31, 2024, 2023, and 2022, respectively (in thousands): Amount of Gain (Loss) Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain (Loss) Reclassified from Year Ended December 31, Year Ended December 31, Derivative 2024 2023 2022 2024 2023 2022 Interest Rate Swaps/Caps $ 41,802 $ 18,484 $ 83,162 Interest expense $ 37,398 $ 42,270 $ 4,989 Share of unconsolidated joint ventures' derivative instruments 6,870 7,399 24,783 Equity in net loss from unconsolidated joint ventures 10,965 16,050 (673) $ 48,672 $ 25,883 $ 107,945 $ 48,363 $ 58,320 $ 4,316 The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of December 31, 2024 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands). Notional Value Strike Rate Effective Date Expiration Date Classification Fair Value Interest Rate Cap $ 658,357 4.000 % November 2024 May 2025 Asset $ 727 Interest Rate Cap 285,000 4.000 % August 2024 July 2025 Asset 423 Interest Rate Swap 250,000 3.608 % April 2023 February 2026 Asset 1,309 Interest Rate Swap 250,000 3.608 % April 2023 February 2026 Asset 1,309 Interest Rate Swap 177,000 1.555 % December 2022 February 2026 Asset 4,964 Interest Rate Swap 268,750 4.039 % July 2024 September 2028 Liability (534) Interest Rate Swap 268,750 4.058 % July 2024 September 2028 Liability (711) Interest Rate Swap 537,500 4.065 % July 2024 September 2028 Liability (1,628) $ 5,859

Lease Income

Lease Income	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Lease Income	Lease Income The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs. Future minimum rents to be received over the next five years and thereafter for operating leases in effect at December 31, 2024 are as follows (in thousands): 2025 $ 544,452 2026 507,298 2027 454,095 2028 390,475 2029 355,565 Thereafter 1,402,994 $ 3,654,879 The components of lease income from operating leases in our consolidated statements of operations for the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Fixed lease payments $ 545,573 $ 589,469 $ 583,107 Variable lease payments 63,004 79,641 82,676 Total lease payments (1) $ 608,577 $ 669,110 $ 665,783 Amortization of acquired above and below-market leases (2,578) 14,225 5,717 Total rental revenue $ 605,999 $ 683,335 $ 671,500 (1) Amounts include $188.5 million and $196.5 million of sublease income for the years ended December 31, 2024 and 2023, respectively. The table below summarizes our investment in sales-type leases as of December 31, 2024: Property Year of Current Expiration Year of Final Expiration (1) 15 Beekman (2) 2089 2089 (1) Reflects exercise of all available renewal options. (2) In August 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company for the building at 15 Beekman. See Note 6, "Investments in Unconsolidated Joint Ventures." Future minimum lease payments to be received over the next five years and thereafter for our sales-type leases with initial terms in excess of one year as of December 31, 2024 are as follows (in thousands): Sales-type leases 2025 $ 3,228 2026 3,276 2027 3,325 2028 3,375 2029 3,426 Thereafter 193,367 Total minimum lease payments $ 209,997 Amount representing interest (103,044) Investment in sales-type leases (1) $ 106,953 (1) This amount is included in Other assets in our consolidated balance sheets. The components of lease income from sales-type leases during the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Interest income (1) $ 4,500 $ 4,444 $ 4,389 (1) These amounts are included in Interest expense, net of interest income in our consolidated statements of operations.
Lease Income	Lease Income The Operating Partnership is the lessor and the sublessor to tenants under operating and sales-type leases. The minimum rental amounts due under the leases are generally subject to scheduled fixed increases or adjustments. The leases generally also require that the tenants reimburse us for increases in certain operating costs and real estate taxes above their base year costs. Future minimum rents to be received over the next five years and thereafter for operating leases in effect at December 31, 2024 are as follows (in thousands): 2025 $ 544,452 2026 507,298 2027 454,095 2028 390,475 2029 355,565 Thereafter 1,402,994 $ 3,654,879 The components of lease income from operating leases in our consolidated statements of operations for the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Fixed lease payments $ 545,573 $ 589,469 $ 583,107 Variable lease payments 63,004 79,641 82,676 Total lease payments (1) $ 608,577 $ 669,110 $ 665,783 Amortization of acquired above and below-market leases (2,578) 14,225 5,717 Total rental revenue $ 605,999 $ 683,335 $ 671,500 (1) Amounts include $188.5 million and $196.5 million of sublease income for the years ended December 31, 2024 and 2023, respectively. The table below summarizes our investment in sales-type leases as of December 31, 2024: Property Year of Current Expiration Year of Final Expiration (1) 15 Beekman (2) 2089 2089 (1) Reflects exercise of all available renewal options. (2) In August 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company for the building at 15 Beekman. See Note 6, "Investments in Unconsolidated Joint Ventures." Future minimum lease payments to be received over the next five years and thereafter for our sales-type leases with initial terms in excess of one year as of December 31, 2024 are as follows (in thousands): Sales-type leases 2025 $ 3,228 2026 3,276 2027 3,325 2028 3,375 2029 3,426 Thereafter 193,367 Total minimum lease payments $ 209,997 Amount representing interest (103,044) Investment in sales-type leases (1) $ 106,953 (1) This amount is included in Other assets in our consolidated balance sheets. The components of lease income from sales-type leases during the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Interest income (1) $ 4,500 $ 4,444 $ 4,389 (1) These amounts are included in Interest expense, net of interest income in our consolidated statements of operations.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Benefit Plans	Benefit Plans The building employees are covered by multi-employer defined benefit pension plans and post-retirement health and welfare plans. We participate in the Building Service 32BJ, or Union, Pension Plan and Health Plan. The Pension Plan is a multi-employer, non-contributory defined benefit pension plan that was established under the terms of collective bargaining agreements between the Service Employees International Union, Local 32BJ, the Realty Advisory Board on Labor Relations, Inc. and certain other employees. This Pension Plan is administered by a joint board of trustees consisting of union trustees and employer trustees and operates under employer identification number 13-1879376. The Pension Plan year runs from July 1 to June 30. Employers contribute to the Pension Plan at a fixed rate on behalf of each covered employee. Separate actuarial information regarding such pension plans is not made available to the contributing employers by the union administrators or trustees, since the plans do not maintain separate records for each reporting unit. However, on September 28, 2022, September 28, 2023 and September 12, 2024, the actuary certified that for the plan years beginning July 1, 2022, July 1, 2023 and July 1, 2024, the Pension Plan was in critical or endangered status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a rehabilitation plan consistent with this requirement. No surcharges have been paid to the Pension Plan as of December 31, 2024. For the Pension Plan years ended June 30, 2024, 2023 and 2022, the plan received contributions from employers totaling $530.3 million, $317.9 million and $305.7 million, respectively. Our contributions to the Pension Plan represent less than 5.0% of total contributions to the plan. The Health Plan was established under the terms of collective bargaining agreements between the Union, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. The Health Plan provides health and other benefits to eligible participants employed in the building service industry who are covered under collective bargaining agreements, or other written agreements, with the Union. The Health Plan is administered by a Board of Trustees with equal representation by the employers and the Union and operates under employer identification number 13-2928869. The Health Plan receives contributions in accordance with collective bargaining agreements or participation agreements. Generally, these agreements provide that the employers contribute to the Health Plan at a fixed rate on behalf of each covered employee. For the Health Plan years ended, June 30, 2024, 2023 and 2022, the plan received contributions from employers totaling $1.7 billion, $1.9 billion and $1.6 billion, respectively. Our contributions to the Health Plan represent less than 5.0% of total contributions to the plan. Contributions we made to the multi-employer plans for the years ended December 31, 2024, 2023 and 2022 are included in the table below (in thousands): Year Ended December 31, Benefit Plan 2024 2023 2022 Pension Plan $ 2,157 $ 2,111 $ 1,952 Health Plan 6,256 7,191 6,386 Other plans 740 789 807 Total plan contributions $ 9,153 $ 10,091 $ 9,145 401(K) Plan In August 1997, we implemented a 401(K) Savings/Retirement Plan, or the 401(K) Plan, to cover eligible employees of ours, and any designated affiliate. The 401(K) Plan permits eligible employees to defer up to 15% of their annual compensation, subject to certain limitations imposed by the Code. The employees' elective deferrals are immediately vested and non-forfeitable upon contribution to the 401(K) Plan. During 2003, we amended our 401(K) Plan to provide for discretionary matching contributions only. For 2024, 2023 and 2022, a matching contribution equal to 100% of the first 4% of annual compensation was made. For the years ended December 31, 2024, 2023 and 2022, we made matching contributions of $2.3 million, $1.8 million, and $1.5 million, respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings As of December 31, 2024, the Company and the Operating Partnership were not involved in any material litigation nor, to management's knowledge, was any material litigation threatened against us or our portfolio which if adversely determined could have a material adverse impact on us. Environmental Matters Our management believes that the properties are in compliance in all material respects with applicable Federal, state and local ordinances and regulations regarding environmental issues. Management is not aware of any environmental liability that it believes would have a materially adverse impact on our financial position, results of operations or cash flows. Management is unaware of any instances in which it would incur significant environmental cost if any of our properties were sold. Employment Agreements We have entered into employment agreements with certain executives, which expire between January 2026 and July 2028. The minimum cash-based compensation associated with these employment agreements, which is comprised only of base salary, totals $2.6 million for 2025. Insurance We maintain “all-risk” property and rental value coverage (including coverage regarding the perils of flood, earthquake and terrorism, excluding nuclear, biological, chemical, and radiological terrorism ("NBCR")), within two property insurance programs and liability insurance. Separate property and liability coverage may be purchased on a stand-alone basis for certain assets, such as development projects. Additionally, one of our captive insurance companies, Belmont Insurance Company, or Belmont, provides coverage for NBCR terrorist acts above a specified trigger. Belmont's retention is reinsured by our other captive insurance company, Ticonderoga Insurance Company ("Ticonderoga"). If Belmont or Ticonderoga are required to pay a claim under our insurance policies, we would ultimately record the loss to the extent of required payments. However, there is no assurance that in the future we will be able to procure coverage at a reasonable cost. Further, if we experience losses that are uninsured or that exceed policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Additionally, our debt instruments contain customary covenants requiring us to maintain insurance and we could default under our debt instruments if the cost and/or availability of certain types of insurance make it impractical or impossible to comply with such covenants relating to insurance. Belmont and Ticonderoga provide coverage solely on properties owned by the Company or its affiliates. Furthermore, with respect to certain of our properties, including properties held by joint ventures or subject to triple net leases, insurance coverage is obtained by a third-party and we do not control the coverage. While we may have agreements with such third parties to maintain adequate coverage and we monitor these policies, such coverage ultimately may not be maintained or adequately cover our risk of loss. Belmont had loss reserves of $3.5 million and $3.3 million as of December 31, 2024 and 2023, respectively. Ticonderoga had no loss reserves as of December 31, 2024 and 2023. Lease Arrangements We are a tenant under leases for certain properties, including ground leases. These leases have expirations from 2033 to 2119, or 2043 to 2119 as fully extended. Certain leases offer extension options which we assess against relevant economic factors to determine whether we are reasonably certain of exercising or not exercising the option. Lease payments associated with renewal periods that we are reasonably certain will be exercised, if any, are included in the measurement of the corresponding lease liability and right of use asset. Certain of our leases are subject to rent resets, generally based on a percentage of the then fair market value, a fixed amount, or a percentage of the preceding rent at specified future dates. Rent resets will be recognized in the periods in which they are incurred. Additionally, certain of our leases are subject to percentage rent arrangements based on thresholds established in the lease agreement, such as percentage of sales at the property. Percentage rents will be recognized in the periods in which they are incurred. The table below summarizes our current lease arrangements as of December 31, 2024: Property (1) Year of Current Expiration Year of Final Expiration (2) 711 Third Avenue (3) 2033 2083 1185 Avenue of the Americas 2043 2043 SL Green Headquarters at One Vanderbilt Avenue (4) 2043 2048 420 Lexington Avenue 2050 2080 SUMMIT One Vanderbilt 2058 2070 15 Beekman (5)(6) 2119 2119 (1) All leases are classified as operating leases unless otherwise specified. (2) Reflects exercise of all available extension options. (3) The Company owns 50% of the fee interest. (4) In March 2021, the Company commenced its lease for its corporate headquarters at One Vanderbilt Avenue. See note 10, "Related Party Transactions." (5) The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease. (6) In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures." The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of December 31, 2024 (in thousands): Financing leases Operating leases 2025 $ 3,228 $ 53,595 2026 3,276 53,734 2027 3,325 53,746 2028 3,375 54,211 2029 3,426 54,443 Thereafter 193,368 1,154,422 Total minimum lease payments $ 209,998 $ 1,424,151 Amount representing interest (103,145) — Amount discounted using incremental borrowing rate — (613,162) Total lease liabilities $ 106,853 $ 810,989 The following table provides lease cost information for the Company's operating leases for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, Operating Lease Costs 2024 2023 2022 Operating lease costs before capitalized operating lease costs $ 24,423 $ 29,637 $ 33,773 Operating lease costs capitalized — (2,345) (6,830) Operating lease costs, net (1) $ 24,423 $ 27,292 $ 26,943 (1) This amount is included in Operating lease rent in our consolidated statements of operations. The following table provides lease cost information for the Company's financing leases for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, Financing Lease Costs 2024 2023 2022 Interest on financing leases before capitalized interest $ 4,502 $ 4,446 $ 4,555 Interest on financing leases, net (1) 4,502 4,446 4,555 Financing lease costs, net $ 4,502 $ 4,446 $ 4,555 (1) These amounts are included in Interest expense, net of interest income in our consolidated statements of operations. (2) These amounts are included in Depreciation and amortization in our consolidated statements of operations. As of December 31, 2024, the weighted-average discount rate used to calculate the lease liabilities was 4.46%. As of December 31, 2024, the weighted-average remaining lease term was 27 years, inclusive of purchase options expected to be exercised.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Segment Information	Segment Information The Company has three operating and reportable segments, real estate, debt and preferred equity investments, and SUMMIT. The results of these segments are provided to and reviewed by the CEO, our chief operating decision maker (“CODM”), who uses this information to assess performance and inform key decisions regarding operations, resources and capital allocation. In 2024, our CODM revised the approach for reviewing results of the operating and reportable segments to be more specific to the respective businesses of each. Previously, the same profit or loss measure was utilized across all segments. With the continued growth and diversification of the Company's revenue sources, we determined that this approach needed to evolve accordingly. As a result, our CODM now evaluates real estate performance and allocates resources based on net operating income ("NOI"), which serves as the profit or loss measure for the operating segment. For our debt and preferred equity investments and SUMMIT operating segment performance, our CODM evaluates and allocates resources based on net income. The CODM does not review asset information as a measure to assess performance. The reportable segment profit or loss measures for the twelve months ended December 31, 2024, December 31, 2023, and December 31, 2022 are as follows (in thousands): December 31, 2024 Real Estate Segment SUMMIT Segment DPE Segment Total Total revenues $ 709,725 $ 133,214 $ 43,333 $ 886,272 Expenses: SUMMIT Operator expenses — 111,739 — SUMMIT Operator tax expense — 730 — Operating Expenses 189,598 — — Real Estate Taxes 128,187 — — Operating lease rent 24,423 — — Net operating income from unconsolidated joint ventures $ 363,113 Real Estate segment Net operating income $ 730,630 $ 730,630 Equity in net loss (income) from unconsolidated joint ventures — 11,513 Depreciation and amortization (2,436) — Interest expense, net of interest income — (28,142) Interest expense on senior obligations of consolidated securitization vehicles — (14,634) SUMMIT and DPE Net income $ 18,309 $ 12,070 $ 30,379 Non-operating net loss from unconsolidated joint ventures (291,131) Marketing, general and administrative expense (85,187) Transaction related costs (401) Gain on early extinguishment of debt 43,762 Depreciable real estate reserves (104,071) Depreciable real estate reserves in unconsolidated joint venture (263,190) Gain on sale of real estate, net 3,025 Purchase price and other fair value adjustments 88,966 Equity in net gain on sale of interest in unconsolidated joint venture/real estate 208,144 Depreciation and amortization (205,007) Amortization of deferred financing costs (6,619) Interest expense, net of interest income (119,078) Net Income $ 30,222 December 31, 2023 Real Estate Segment SUMMIT Segment DPE Segment Total Total revenues $ 760,745 $ 118,260 $ 34,705 $ 913,710 Expenses: SUMMIT Operator expenses — 101,211 — SUMMIT Operator tax expense — 9,201 — Operating Expenses 196,696 — — Real Estate Taxes 143,757 — — Operating lease rent 27,292 — — Net operating income from unconsolidated joint ventures 205,694 Real Estate segment Net operating income $ 598,694 $ 598,694 Loan loss and other investment reserves, net of recoveries — (6,890) Depreciation and amortization (1,747) — Interest expense, net of interest income — (34,149) SUMMIT and DPE Net income $ 6,101 $ (6,334) $ (233) Non-operating net loss from unconsolidated joint ventures (282,203) Marketing, general and administrative expense (111,389) Transaction related costs (1,099) Loss on early extinguishment of debt (870) Depreciable real estate reserves (382,374) Loss on sale of real estate, net (32,370) Purchase price and other fair value adjustments (17,260) Equity in net loss on sale of interest in unconsolidated joint venture/real estate (13,368) Depreciation and amortization (246,063) Amortization of deferred financing costs (7,837) Interest expense, net of interest income (102,965) Net Loss $ (599,337) December 31, 2022 Real Estate Segment SUMMIT Segment DPE Segment Total Total revenues $ 749,293 $ 89,048 $ 81,113 $ 919,454 Expenses: SUMMIT Operator expenses — 89,207 — SUMMIT Operator tax expense — 2,647 — Operating Expenses 174,063 — — Real Estate Taxes 26,943 — — Operating lease rent 138,228 — — Net operating income from unconsolidated joint ventures $ 195,508 Real Estate segment Net operating income $ 605,567 $ 605,567 Depreciation and amortization (862) — Interest expense, net of interest income — (25,133) SUMMIT and DPE Net income $ (3,668) $ 55,980 $ 52,312 Non-operating net loss from unconsolidated joint ventures (253,466) Marketing, general and administrative expense (93,798) Transaction related costs (409) Depreciable real estate reserves (6,313) Loss on sale of real estate, net (84,485) Purchase price and other fair value adjustments (8,118) Equity in net loss on sale of interest in unconsolidated joint venture/real estate (131) Depreciation and amortization (215,305) Amortization of deferred financing costs (7,817) Interest expense, net of interest income (64,340) Net Loss $ (76,303) For the real estate segment, the primary sources of revenue are tenant rents and escalations and reimbursement revenue. See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments. We allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. SUMMIT currently operates one location at One Vanderbilt Avenue in midtown Manhattan with the primary source of revenue generated from ticket sales. There were no transactions between the above three segments other than the SUMMIT lease with our One Vanderbilt Avenue joint venture, which is part of the real estate segment. See Note 10, "Related Party Transactions."

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2024
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	Column A Column B Column C Column D Cost Capitalized Subsequent To Acquisition (1) Column E Gross Amount at Which Column F Column G Column H Column I Description (2) Encumbrances Land Building & Land Building & Land Building & Total Accumulated Depreciation Date of Date Life on 420 Lexington Ave $ 272,326 $ — $ 333,499 $ — $ 79,607 $ — $ 413,106 $ 413,106 $ 233,848 1927 3/1998 Various 711 Third Avenue — 19,844 115,769 — 16,578 19,844 132,347 152,191 84,768 1955 5/1998 Various 555 W. 57th Street — 18,846 140,946 — 21,526 18,846 162,472 181,318 103,967 1971 1/1999 Various 461 Fifth Avenue — — 88,276 28,873 15,200 28,873 103,476 132,349 49,460 1988 10/2003 Various 750 Third Avenue — 51,093 251,523 — 114,773 51,093 366,296 417,389 115,992 1958 7/2004 Various 485 Lexington Avenue 450,000 78,282 452,631 — (4,635) 78,282 447,996 526,278 217,606 1956 12/2004 Various 810 Seventh Avenue — 114,077 550,819 — 13,809 114,077 564,628 678,705 252,324 1970 1/2007 Various 1185 Avenue of the Americas — — 791,106 — 46,785 — 837,891 837,891 418,159 1969 1/2007 Various 1350 Avenue of the Americas — 90,941 431,517 — 26,318 90,941 457,835 548,776 211,252 1966 1/2007 Various 1-6 Landmark Square (3) 100,000 27,852 161,343 (6,939) (13,804) 20,913 147,539 168,452 51,883 1973-1984 1/2007 Various 7 Landmark Square (3) — 1,721 8,417 (1,338) (6,235) 383 2,182 2,565 783 2007 1/2007 Various 100 Church Street 370,000 34,994 183,932 — 16,674 34,994 200,606 235,600 84,431 1959 1/2010 Various 125 Park Avenue — 120,900 270,598 — 30,032 120,900 300,630 421,530 139,949 1923 10/2010 Various 19 East 65th Street — 8,603 2,074 — 4,990 8,603 7,064 15,667 10 1929 1/2012 Various 304 Park Avenue — 54,489 90,643 — 12,056 54,489 102,699 157,188 36,859 1930 6/2012 Various 760 Madison Avenue — 284,286 8,314 (2,748) 165,708 281,538 174,022 455,560 5,315 1996/2012 7/2014 Various 110 Greene Street — 45,120 228,393 — 4,741 45,120 233,134 278,254 64,093 1910 7/2015 Various 7 Dey / 185 Broadway 190,148 45,540 27,865 — 209,670 45,540 237,535 283,075 21,860 1921 8/2015 Various 885 Third Avenue (4) — 138,444 244,040 (138,444) (119,024) — 125,016 125,016 15,506 1986 7/2020 Various 690 Madison — 13,820 51,732 (7,985) (27,336) 5,835 24,396 30,231 5,132 1879 9/2021 Various 100 Park Avenue (5) 360,000 230,891 133,269 — — 230,891 133,269 364,160 — 1950 2/2000 Various 10 East 53rd Street (5) 205,000 104,143 62,470 — — 104,143 62,470 166,613 4,710 1971 2/2012 Various Other (6) — 20,637 16,224 (18,901) (2,133) 1,736 14,091 15,827 8,174 Total $ 1,947,474 $ 1,504,523 $ 4,645,400 $ (147,482) $ 605,300 $ 1,357,041 $ 5,250,700 $ 6,607,741 $ 2,126,081 (1) Includes depreciable real estate reserves and impairments recorded subsequent to acquisition. (2) All properties located in New York, New York, unless otherwise noted. (3) Property located in Connecticut. (4) In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building. (5) Initial cost is the fair value that was determined upon consolidation of these investments in 2024. (6) Other includes tenant improvements of eEmerge, capitalized interest and corporate improvements. The changes in real estate for the years ended December 31, 2024, 2023 and 2022 are as follows (in thousands): Year Ended December 31, 2024 2023 2022 Balance at beginning of year $ 6,102,864 $ 9,198,799 $ 7,650,907 Property acquisitions — — 1,900,042 Improvements 199,416 241,213 335,413 Retirements/disposals/deconsolidation 305,461 (2,383,912) (687,563) Reclassification (1) — (953,236) — Balance at end of year $ 6,607,741 $ 6,102,864 $ 9,198,799 The aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes as of December 31, 2024 was $4.9 billion (unaudited). The changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures, for the years ended December 31, 2024, 2023 and 2022 are as follows (in thousands): Year Ended December 31, 2024 2023 2022 Balance at beginning of year $ 1,968,004 $ 2,039,554 $ 1,896,199 Depreciation for year 171,744 199,576 175,465 Retirements/disposals/deconsolidation (13,667) (203,819) (32,110) Reclassification (1) — (67,307) Balance at end of year $ 2,126,081 $ 1,968,004 $ 2,039,554 (1) Beginning in the second quarter of 2024, we reclassified amounts recorded for certain right-of-use assets classified as operating leases from a gross presentation above accumulated depreciation to a net presentation below accumulated depreciation in our consolidated balance sheets. This includes reclassifying the related amortization that was previously included in the accumulated depreciation balance. As such, we no longer present right-of-use assets and related amortization in Schedule III - Real Estate and Accumulated Depreciation. See the "Reclassification" section of Note 2, "Significant Accounting Policies" for more information regarding this reclassification.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net income (loss) attributable to SL Green/SLGOP	$ 22,010	$ (564,559)	$ (78,074)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	The Company's business and proprietary information, information technology and operational technology assets are important to its success. The Company's cybersecurity program is designed to protect its information assets and operations from external and internal cyber threats by seeking to mitigate and manage risks while helping to ensure business resilience. The program is applied across all levels of the Company. The Company takes a risk-based approach to cybersecurity and has implemented policies that are designed to address cybersecurity threats and incidents, including those related to third-party service providers. The Company assesses risks from cybersecurity threats, monitors its information systems for potential vulnerabilities and tests those systems pursuant to the Company's cybersecurity standards, processes and practices, as part of the Company's overall risk management system. The Company also leverages external resources and advisors as needed to reinforce its cybersecurity capacity. External consultants perform testing exercises to further assess the Company's cybersecurity program on an annual basis, or more frequently if circumstances warrant such testing. The Company's cybersecurity strategy is guided by prioritized risk, the National Institute for Standards and Technology (NIST) Cybersecurity Framework, and emerging business needs. The Company maintains a cybersecurity incident response plan, as well as a monitoring program, to support senior leadership and the Board. The Company's cybersecurity team manages its incident response plan and monitoring program. Company employees are provided cybersecurity awareness training, which includes topics on the Company's policies and procedures for reporting potential incidents. The Company's cybersecurity team is focused on evaluating emerging risks, regulations, and compliance matters and updating the policies and procedures accordingly. To date, cybersecurity risks, including as a result of any previous cybersecurity incidents, have not materially affected and we believe are not reasonably likely to affect the Company, including its business strategy, results of operations or financial condition. Refer to the risk factor captioned “Our business and operations would suffer in the event of system failures or cyber security attacks” in Part I, Item 1A. “Risk Factors” for additional description of cybersecurity risks and potential related impacts on the Company.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	The Company's business and proprietary information, information technology and operational technology assets are important to its success. The Company's cybersecurity program is designed to protect its information assets and operations from external and internal cyber threats by seeking to mitigate and manage risks while helping to ensure business resilience. The program is applied across all levels of the Company.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Board oversees the Company's risk management process directly and through its committees. Pursuant to the Audit Committee Charter, the Audit Committee of the Board provides compliance oversight to the Company's risk assessment and risk management policies and the steps management has taken to monitor and mitigate such exposures and risks.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Board oversees the Company's risk management process directly and through its committees. Pursuant to the Audit Committee Charter, the Audit Committee of the Board provides compliance oversight to the Company's risk assessment and risk management policies and the steps management has taken to monitor and mitigate such exposures and risks.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Senior Vice President, Information Technology reports to the Board, the Audit Committee and management on cybersecurity risk assessment, policies, incident prevention, detection, mitigation, and remediation of cybersecurity incidents on an as needed basis.
Cybersecurity Risk Role of Management [Text Block]	The Board oversees the Company's risk management process directly and through its committees. Pursuant to the Audit Committee Charter, the Audit Committee of the Board provides compliance oversight to the Company's risk assessment and risk management policies and the steps management has taken to monitor and mitigate such exposures and risks.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Company's Senior Director, Information Security & Network Systems, in coordination with the Senior Vice President, Information Technology, is responsible for leading the assessment and management of cybersecurity risks. The Senior Director, Information Security & Network Systems and Senior Vice President, Information Technology regularly review and assess cybersecurity initiatives and are informed about and monitor the prevention, detection, mitigation, and remediation of cybersecurity incidents through briefings with internal and external personnel as well as alerts from security measures deployed in the Company's IT environment. These individuals collectively have over 30 years of experience in information security. The Senior Vice President, Information Technology reports to the Board, the Audit Committee and management on cybersecurity risk assessment, policies, incident prevention, detection, mitigation, and remediation of cybersecurity incidents on an as needed basis.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	These individuals collectively have over 30 years of experience in information security.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Company's Senior Director, Information Security & Network Systems, in coordination with the Senior Vice President, Information Technology, is responsible for leading the assessment and management of cybersecurity risks. The Senior Director, Information Security & Network Systems and Senior Vice President, Information Technology regularly review and assess cybersecurity initiatives and are informed about and monitor the prevention, detection, mitigation, and remediation of cybersecurity incidents through briefings with internal and external personnel as well as alerts from security measures deployed in the Company's IT environment. These individuals collectively have over 30 years of experience in information security. The Senior Vice President, Information Technology reports to the Board, the Audit Committee and management on cybersecurity risk assessment, policies, incident prevention, detection, mitigation, and remediation of cybersecurity incidents on an as needed basis.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include our accounts and those of our subsidiaries, which are wholly owned or controlled by us. Entities which we have significant influence, but do not control, through our voting interest and entities which are variable interest entities, but where we are not the primary beneficiary, are accounted for under the equity method. See Note 5, "Debt and Preferred Equity Investments" and Note 6, "Investments in Unconsolidated Joint Ventures." All significant intercompany balances and transactions have been eliminated. We consolidate a VIE in which we are considered the primary beneficiary. The primary beneficiary is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. A noncontrolling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to us. Noncontrolling interests are required to be presented as a separate component of equity in the consolidated balance sheet and the presentation of net income is modified to present earnings and other comprehensive income (loss) attributed to controlling and noncontrolling interests. We assess the accounting treatment for each joint venture and debt and preferred equity investment. This assessment includes a review of each joint venture or limited liability company agreement to determine the rights provided to each party and whether those rights are protective or participating. For all VIEs, we review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity's economic performance. In situations where we and our partner approve, among other things, the annual budget, receive a detailed monthly reporting package, meet on a quarterly basis to review the results of the joint venture, review and approve the joint venture's tax return before filing, and approve all leases that cover more than a nominal amount of space relative to the total rentable space at each property, we do not consolidate the joint venture as we consider these to be substantive participation rights that result in shared power of the activities that most significantly impact the performance of the joint venture. Our joint venture agreements typically contain certain protective rights such as requiring partner approval to sell, finance or refinance the property and the payment of capital expenditures and operating expenditures outside of the approved budget or operating plan.
Investment in Commercial Real Estate Properties	Investment in Commercial Real Estate Properties Real estate properties are presented at cost less accumulated depreciation and amortization. Costs directly related to the development or redevelopment of properties are capitalized. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. We recognize the assets acquired, liabilities assumed (including contingencies) and any noncontrolling interests in an acquired entity at their respective fair values on the acquisition date. When we acquire our partner's equity interest in an existing unconsolidated joint venture and gain control over the investment, we record the consolidated investment at fair value. The difference between the book value of our equity investment on the purchase date and our share of the fair value of the investment's purchase price is recorded as a purchase price fair value adjustment in our consolidated statements of operations. See Note 3, "Property Acquisitions." We allocate the purchase price of real estate to land and building (inclusive of tenant improvements) and, if determined to be material, intangibles, such as the value of above- and below-market leases and origination costs associated with the in-place leases. We depreciate the amount allocated to building (inclusive of tenant improvements) over their estimated useful lives, which generally range from 3 years to 40 years. We amortize the amount allocated to the above- and below-market leases over the remaining term of the associated lease, which generally range from 1 year to 15 years, and record it as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental income. We amortize the amount allocated to the values associated with in-place leases over the expected term of the associated lease, which generally ranges from 1 year to 15 years. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. Origination costs are amortized as an expense over the remaining life of the lease and tenant improvements are amortized over the shorter of the remaining life of the lease or useful life of improvement (or charged against earnings if the lease is terminated prior to its contractual expiration date). When allocating the purchase price of real estate, we assess fair value of the leases based on estimated cash flow projections that utilize appropriate discount rates and available market information. Estimates of future cash flows are based on a number of factors including the historical operating results, known trends, and market/economic conditions that may affect the property. To the extent acquired leases contain fixed rate renewal options that are below-market and determined to be material, we amortize such below-market lease value into rental income over the renewal period. As of December 31, 2024, the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 10.0 years, 12.1 years, and 8.9 years, respectively. The Company classifies those leases under which the Company is the lessee at lease commencement as finance or operating leases. Leases qualify as finance leases if i) the lease transfers ownership of the asset at the end of the lease term, ii) the lease grants an option to purchase the asset that we are reasonably certain to exercise, iii) the lease term is for a major part of the remaining economic life of the asset, iv) the present value of the lease payments equals or exceeds substantially all of the fair value of the underlying asset, or v) the underlying asset is of such a specialized nature that it is expected to have no alternative use to the lessor at the end of the lease term. Leases that do not qualify as finance leases are deemed to be operating leases. At lease commencement the Company records a lease liability which is measured as the present value of the lease payments and a right of use asset which is measured as the amount of the lease liability and any initial direct costs incurred. The Company applies a discount rate to determine the present value of the lease payments. If the rate implicit in the lease is known, the Company uses that rate. If the rate implicit in the lease is not known, the Company uses a discount rate reflective of the Company's collateralized borrowing rate given the term of the lease. To determine the discount rate, the Company employs a third party specialist to develop an analysis based primarily on the observable borrowing rates of the Company, other REITs, and other corporate borrowers with long-term borrowings. On the consolidated statements of operations, operating leases are expensed through operating lease rent while financing leases are expensed through amortization and interest expense. When applicable, the Company combines the consideration for lease and non-lease components in the calculation of the value of the lease obligation and right-of-use asset. We incur a variety of costs in the development and leasing of our properties. After the determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and building under development include specifically identifiable costs. The capitalized costs include, but are not limited to, pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy upon the completion of tenant improvements, but no later than one year after major construction activity ceases. We cease capitalization on the portions substantially completed and occupied or held available for occupancy, and capitalize only those costs associated with the portions under construction.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with maturity of three months or less when purchased to be cash equivalents.
Restricted Cash	Restricted Cash Restricted cash primarily consists of security deposits held on behalf of our tenants, interest reserves, as well as capital improvement and real estate tax escrows required under certain loan agreements.
Investment in Marketable Securities	Investment in Marketable Securities At acquisition, we designate a debt security as held-to-maturity, available-for-sale, or trading. As of December 31, 2024, we did not have any debt securities designated as trading. We account for our available-for-sale securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported as a component of accumulated other comprehensive income or loss. The cost of marketable securities sold and the amount reclassified out of accumulated other comprehensive income into earnings is determined using the specific identification method. We account for our held-to-maturity securities at amortized cost basis. Credit losses for our debt securities are recognized in accordance with ASC 326. No allowance for loan losses were recognized for the years ended December 31, 2024, 2023 and 2022. We account for equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income.
Investment in CMBS Securitization Trusts	Investment in CMBS Securitization Trusts We may be contracted to provide special servicing activities for CMBS securitization trusts and, in certain cases, we may also acquire securities in these trusts. In certain cases, we may acquire the controlling class of the trust and we may have the right to designate, and remove, the special servicer for these trusts. These circumstances may result in our consolidating the securitization trusts on our financial statements. We evaluate all of our positions and special servicer appointments for consolidation, which are considered to be VIEs to the Company. As the special servicer, we provide services on defaulted loans within the trusts as permitted by the underlying contractual agreements. We receive a fee in exchange for these services. The rights provided to us as special servicer give us the ability to direct activities that could significantly impact the trust's economic performance, which requires consolidation of the securitization trust unless a third party has the right to unilaterally remove us as special servicer without cause. In such instances where we can be removed as special servicer without cause, we do not have the power to direct activities that most significantly impact the trust's economic performance and would not consolidate the securitization trust. For CMBS securitization trusts in which we are determined to be the primary beneficiary, we consolidate the securitization trusts on our consolidated balance sheets. The consolidation of such securitization trusts results in a gross presentation of the underlying collateral loans as assets as well as the senior CMBS positions owned by third parties, which are presented as liabilities on our consolidated balance sheets. The assets of the consolidated securitization trust can only be used to satisfy the liabilities of that securitization and are not available to the Company for any other purpose. Additionally, the senior CMBS securitization trust obligations can only be satisfied through repayment of the underlying collateral loans as they do not have any recourse to the Company or our assets. The Company has not provided any guarantees with respect to the performance or repayment of the senior CMBS obligations. While consolidation of the securitization trust increases the gross presentation of our consolidated balance sheets, it does not impact the economic exposure or performance of the Company as it is limited to that of the actual investment in the CMBS securitization trust, and not the consolidated senior obligations.
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures We account for our investments in unconsolidated joint ventures under the equity method of accounting in cases where we exercise significant influence over, but do not control, these entities and are not considered to be the primary beneficiary. We consolidate those joint ventures that we control or which are variable interest entities (each, a "VIE") and where we are considered to be the primary beneficiary. In all these joint ventures, the rights of the joint venture partner are both protective as well as participating. In scenarios where we are determined to be the primary beneficiary in a VIE, these substantive participating rights held by our joint venture partner preclude us from consolidating these VIE entities. These investments are recorded initially at cost, as investments in unconsolidated joint ventures, and subsequently adjusted for equity in net income (loss) and cash contributions and distributions. Equity in net income (loss) from unconsolidated joint ventures is allocated based on our ownership or economic interest in each joint venture and includes adjustments related to basis differences in accounting for the investment. When a capital event (as defined in each joint venture agreement) such as a refinancing occurs, if return thresholds are met, future equity income will be allocated at our increased economic interest. We recognize incentive income from unconsolidated real estate joint ventures as income to the extent it is earned and not subject to a clawback feature. Distributions we receive from unconsolidated real estate joint ventures in excess of our basis in the investment are recorded as offsets to our investment balance if we remain liable for future obligations of the joint venture or may otherwise be committed to provide future additional financial support. We generally finance our joint ventures with non-recourse debt. In certain cases we may provide guarantees or master leases, which terminate upon the satisfaction of specified circumstances or repayment of the underlying loans. We assess our investments in unconsolidated joint ventures for recoverability, and if it is determined that a loss in value of the investment is other than temporary, we write down the investment to its fair value. We evaluate our equity investments for impairment based on each joint ventures' actual and projected cash flows. Aside from charges noted in Note 6, "Investment in Unconsolidated Joint Ventures," we do not believe that the values of any of our equity investments were impaired at December 31, 2024. We may originate loans for real estate acquisition, development and construction ("ADC loans"), where we expect to receive some of the residual profit from such projects. When the risk and rewards of these arrangements are essentially the same as an investor or joint venture partner, we account for these arrangements as real estate investments under the equity method of accounting for investments. Otherwise, we account for these arrangements consistent with the accounting for our debt and preferred equity investments.
Deferred Lease Costs	Deferred Lease Costs
Deferred Financing Costs	Deferred Financing Costs Deferred financing costs represent commitment fees, legal, title and other third party costs associated with obtaining commitments for financing which result in a closing of such financing. These costs are amortized over the terms of the respective agreements. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking financing transactions, which do not close, are expensed in the period in which it is determined that the financing will not close. Deferred financing costs related to a recognized debt liability are presented in the consolidated balance sheet as a direct deduction from the carrying amount of that debt liability.
Lease Classification	Lease Classification Lease classification for leases under which the Company is the lessor is evaluated at lease commencement and leases not classified as sales-type leases or direct financing leases are classified as operating leases. Leases qualify as sales-type leases if the contract includes either transfer of ownership clauses, certain purchase options, a lease term representing a major part of the economic life of the asset, or the present value of the lease payments and residual guarantees provided by the lessee exceeds substantially all of the fair value of the asset. Additionally, leasing an asset so specialized that it is not deemed to have any value to the Company at the end of the lease term may also result in classification as a sales-type lease. Leases qualify as direct financing leases when the present value of the lease payments and residual value guarantees provided by the lessee and unrelated third parties exceeds substantially all of the fair value of the asset and collection of the payments is probable.
Revenue Recognition	Revenue Recognition Rental revenue for operating leases is recognized on a straight-line basis over the term of the lease. Rental revenue recognition commences when the leased space is available for its intended use by the lessee. To determine whether the leased space is available for its intended use by the lessee, management evaluates whether we or the tenant are the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space. The excess of rents recognized over amounts contractually due pursuant to the underlying leases are included in deferred rents receivable on the consolidated balance sheets. In addition to base rent, our tenants also generally will pay variable rent which represents their pro rata share of increases in real estate taxes and certain operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in certain building operating expenses, the tenant will pay additional rent based upon increases in the wage rate paid to porters over the porters' wage rate in effect during a base year or increases in the consumer price index over the index value in effect during a base year. In addition, many of our leases contain fixed percentage increases over the base rent to cover escalations. Electricity is most often supplied by the landlord either on a sub-metered basis, or rent inclusion basis (i.e., a fixed fee is included in the rent for electricity, which amount may increase based upon increases in electricity rates or increases in electrical usage by the tenant). Base building services other than electricity (such as heat, air conditioning and freight elevator service during business hours, and base building cleaning) are typically provided at no additional cost, with the tenant paying additional rent only for services which exceed base building services or for services which are provided outside normal business hours. These escalations are based on actual expenses incurred in the prior calendar year. If the expenses in the current year are different from those in the prior year, then during the current year, the escalations will be adjusted to reflect the actual expenses for the current year. Rental revenue is recognized if collectability is probable. If collectability of substantially all of the lease payments is assessed as not probable, any difference between the rental revenue recognized to date and the lease payments that have been collected is recognized as a current-period adjustment to rental revenue. A subsequent change in the assessment of collectability to probable may result in a current-period adjustment to rental revenue for any difference between the rental revenue that would have been recognized if collectability had always been assessed as probable and the rental revenue recognized to date. The Company provides its tenants with certain customary services for lease contracts such as common area maintenance and general security. We have elected to combine the non-lease components with the lease components of our operating lease agreements and account for them as a single lease component in accordance with ASC 842. We record a gain or loss on sale of real estate assets when we no longer have a controlling financial interest in the entity owning the real estate, a contract exists with a third party and that third party has control of the assets acquired. Investment income on debt and preferred equity investments is accrued based on the contractual terms of the instruments and when it is deemed collectible. Some debt and preferred equity investments provide for accrual of interest at specified rates, which differ from current payment terms. Interest is recognized on such loans at the accrual rate subject to management's determination that accrued interest is collectible. If management cannot make this determination, interest income above the current pay rate is recognized only upon actual receipt. Deferred origination fees, original issue discounts and loan origination costs, if any, are recognized as an adjustment to interest income over the terms of the related investments using the effective interest method. Fees received in connection with loan commitments are also deferred until the loan is funded and are then recognized over the term of the loan as an adjustment to yield. Discounts or premiums associated with the purchase of loans are amortized or accreted into interest income as a yield adjustment on the effective interest method based on expected cash flows through the expected maturity date of the related investment. If we purchase a debt or preferred equity investment at a discount, intend to hold it until maturity and expect to recover the full value of the investment, we accrete the discount into income as an adjustment to yield over the term of the investment. If we purchase a debt or preferred equity investment at a discount with the intention of foreclosing on the collateral, we do not accrete the discount. For debt investments acquired at a discount for credit quality, the difference between contractual cash flows and expected cash flows at acquisition is not accreted. Anticipated exit fees, the collection of which is expected, are also recognized over the term of the loan as an adjustment to yield. We consider a debt and preferred equity investment to be past due when amounts contractually due have not been paid. Debt and preferred equity investments are placed on a non-accrual status at the earlier of the date at which payments become 90 days past due or when, in the opinion of management, a full recovery of interest income becomes doubtful. Interest income recognition is resumed on any debt or preferred equity investment that is on non-accrual status when such debt or preferred equity investment becomes contractually current and performance is demonstrated to be resumed. We may syndicate a portion of the loans that we originate or sell the loans individually. When a transaction meets the criteria for sale accounting, we recognize gain or loss based on the difference between the sales price and the carrying value of the loan sold. Any related unamortized deferred origination fees, original issue discounts, loan origination costs, discounts or premiums at the time of sale are recognized as an adjustment to the gain or loss on sale, which is included in investment income on the consolidated statement of operations. Any fees received at the time of sale or syndication are recognized as part of investment income. Asset management fees are recognized on a straight-line basis over the term of the asset management agreement. Revenues from the sale of SUMMIT tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2024 and 2023 was $3.1 million and $2.6 million, respectively, and is included in Deferred revenue on the consolidated balance sheets.
Debt and Preferred Equity Investments	Debt and Preferred Equity Investments Debt and preferred equity investments are presented at the net amount expected to be collected in accordance with ASC 326. An allowance for loan losses is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected through the expected maturity date of such investments. The expense for loan loss and other investment reserves is the charge to earnings to adjust the allowance for loan losses to the appropriate level. Amounts are written off from the allowance when we de-recognize the related investment either as a result of a sale of the investment or acquisition of equity interests in the collateral. The Company evaluates the amount expected to be collected based on current market and economic conditions, historical loss information, and reasonable and supportable forecasts. The Company's assumptions are derived from both internal data and external data which may include, among others, governmental economic projections for the New York City Metropolitan area, public data on recent transactions and filings for securitized debt instruments. This information is aggregated by asset class and adjusted for duration. Based on these inputs, loans are evaluated at the individual asset level. In certain instances, we may also use a probability-weighted model that considers the likelihood of multiple outcomes and the amount expected to be collected for each outcome. The evaluation of the possible credit deterioration associated with the performance and/or value of the underlying collateral property as well as the financial and operating capability of the borrower/sponsor requires significant judgment, which include both asset level and market assumptions over the relevant time period. In addition, quarterly, the Company assigns each loan a risk rating. Based on a 3-point scale, loans are rated “1” through “3,” from lower risk to higher risk, which ratings are defined as follows: 1 - Low Risk Assets - Low probability of loss, 2 - Watch List Assets - Higher potential for loss, 3 - High Risk Assets - Loss more likely than not. Loans with risk ratings of 2 or above are evaluated to determine whether the expected risk of loss is appropriately captured through the combination of our expectations of current conditions, historical loss information and supportable forecasts described above or whether risk characteristics specific to the loan warrant the use of a probability-weighted model. Financing investments that are classified as held for sale are carried at the expected amount to be collected or fair market value using available market information obtained through consultation with dealers or other originators of such investments as well as discounted cash flow models based on Level 3 data pursuant to ASC 820-10. As circumstances change, management may conclude not to sell an investment designated as held for sale. In such situations, the investment will be reclassified at its expected amount to be collected. Other financing receivables that are included in balance sheet line items other than the Debt and preferred equity investments line are also measured at the net amount expected to be collected. Accrued interest receivable amounts related to these debt and preferred equity investment and other financing receivables are recorded at the net amount expected to be collected within Other assets in the consolidated balance sheets. Accrued interest receivables that are written off are recognized as an expense in loan loss and other investment reserves.
Rent Expense	Rent Expense Rent expense is recognized on a straight-line basis over the initial term of the lease. The excess of the rent expense recognized over the amounts contractually due pursuant to the underlying lease is included in the lease liability - operating leases on the consolidated balance sheets.
Underwriting Commissions and Costs	Underwriting Commissions and Costs Underwriting commissions and costs incurred in connection with our stock offerings are reflected as a reduction of additional paid-in-capital.
Transaction Costs	Transaction Costs Transaction costs for real estate asset acquisitions are capitalized to the investment basis, which is then subject to a purchase price allocation based on relative fair value. Transaction costs for business combinations or costs incurred on potential transactions that are not consummated are expensed as incurred.
Income Taxes	Income Taxes SL Green is taxed as a REIT under Section 856(c) of the Code. As a REIT, SL Green generally is not subject to Federal income tax. To maintain its qualification as a REIT, SL Green must distribute at least 90% of its REIT taxable income to its stockholders and meet certain other requirements. If SL Green fails to qualify as a REIT in any taxable year, SL Green will be subject to Federal income tax on its taxable income at regular corporate rates. SL Green may also be subject to certain state, local and franchise taxes. Under certain circumstances, Federal income and excise taxes may be due on its undistributed taxable income. The Operating Partnership is a partnership and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective income tax returns. The only provision for income taxes included in the consolidated statements of operations relates to the Operating Partnership's consolidated taxable REIT subsidiaries. The Operating Partnership may also be subject to certain state, local and franchise taxes. We have elected, and may elect in the future, to treat certain of our corporate subsidiaries as taxable REIT subsidiaries, or TRSs. In general, TRSs may perform non-customary services for the tenants of the Company, hold assets that we cannot hold directly and generally may engage in any real estate or non-real estate related business. The TRSs generate income, resulting in Federal, state and local corporate tax liability for these entities. During the years ended December 31, 2024, 2023 and 2022, we recorded Federal, state and local tax provisions of $4.9 million, $8.2 million, and $3.7 million, respectively. SUMMIT is held in a TRS and pays Federal, state, and local taxes. During the years ended December 31, 2024, 2023 and 2022, we recorded Federal, state and local tax expense for SUMMIT of $0.7 million, $9.2 million, and $2.6 million, respectively. For the year ended December 31, 2024, the Company paid distributions on its common stock of $3.16 per share which represented $0.23 per share of ordinary income and $2.93 per share of capital gains. For the year ended December 31, 2023, the Company paid distributions on its common stock of $3.25 per share which represented $0.00 per share of ordinary income, and $3.25 per share of capital gains. For the year ended December 31, 2022, the Company paid distributions on its common stock of $6.17 per share which represented $2.56 per share of ordinary income and $1.17 per share of capital gains. We follow a two-step approach for evaluating uncertain tax positions. Recognition (step one) occurs when an enterprise concludes that a tax position, based solely on its technical merits, is more-likely-than-not to be sustained upon examination. Measurement (step two) determines the amount of benefit that is more-likely-than-not to be realized upon settlement. Derecognition of a tax position that was previously recognized would occur when a company subsequently determines that a tax position no longer meets the more-likely-than-not threshold of being sustained. The use of a valuation allowance as a substitute for derecognition of tax positions is prohibited.
Stock Based Employee Compensation Plans	Stock Based Employee Compensation Plans We have a stock-based employee compensation plan, described more fully in Note 14, "Share-based Compensation." For share-based awards with a performance or market measure, we recognize compensation cost over the requisite service period, using the accelerated attribution expense method. The requisite service period begins on the date the compensation committee of our Board of Directors authorizes the award, adopts any relevant performance measures and communicates the award to the employees. For programs with awards that vest based on the achievement of a performance condition or market condition, we determine whether it is probable that the performance condition will be met, and estimate compensation cost based on the fair value of the award at the applicable award date estimated using a binomial model or market quotes. For share-based awards for which there is no pre-established performance measure, we recognize compensation cost over the service vesting period, which represents the requisite service period, on a straight-line basis. In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of the Company's common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period. Awards can also be made in the form of a separate series of units of limited partnership interest in the Operating Partnership called long-term incentive plan units, or LTIP units. LTIP units, which can be granted either as free-standing awards or in tandem with other awards under our stock incentive plan, are valued by reference to the value of the Company's common stock at the time of grant and are subject to such conditions and restrictions as the compensation committee of the Company's board of directors may determine, including continued employment or service, computation of financial metrics and/or achievement of pre-established performance goals and objectives. The Company's stock options are recorded at fair value at the time of issuance. Fair value of the stock options is determined using the Black-Scholes option pricing model. The Black-Scholes model was developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our plan has characteristics significantly different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in our opinion, the existing models do not necessarily provide a reliable single measure of the fair value of the employee stock options. Compensation cost for stock options, if any, is recognized over the vesting period of the award. Our policy is to grant options with an exercise price equal to the quoted closing market price of the Company's common stock on either the grant date or the date immediately preceding the grant date. Awards of stock or restricted stock are expensed as compensation over the benefit period based on the fair value of the stock on the grant date.
Derivative Instruments	Derivative Instruments In the normal course of business, we use a variety of commonly used derivative instruments, including, but not limited to, interest rate swaps, caps, collars and floors, to manage interest rate risk. Effectiveness is essential for those derivatives that we intend to qualify for hedge accounting. Some derivative instruments are associated with an anticipated transaction. In those cases, hedge effectiveness criteria also require that it be probable that the underlying transaction occurs. Instruments that meet these hedging criteria are formally designated as hedges at the inception of the derivative contract. To determine the fair values of derivative instruments, we use a variety of methods and assumptions that are based on market conditions and risks existing at each balance sheet date. For the majority of financial instruments including most derivatives, long-term investments and long-term debt, standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost, and termination cost are used to determine fair value. All methods of assessing fair value result in a general approximation of value, and such value may never actually be realized. In the normal course of business, we are exposed to the effect of interest rate changes and limit these risks by following established risk management policies and procedures including the use of derivatives. To address exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices and manage the cost of borrowing obligations. We use a variety of conventional derivative products. These derivatives include, but are not limited to, interest rate swaps, caps, collars and floors. We expressly prohibit the use of unconventional derivative instruments and using derivative instruments for trading or speculative purposes. Further, we have a policy of only entering into contracts with major financial institutions based upon their credit ratings and other factors. We may employ swaps, forwards or purchased options to hedge qualifying forecasted transactions. Gains and losses related to these transactions are deferred and recognized in net income as interest expense in the same period or periods that the underlying transaction occurs, expires or is otherwise terminated. Hedges that are reported at fair value and presented on the balance sheet could be characterized as cash flow hedges or fair value hedges. Interest rate caps and collars are examples of cash flow hedges. Cash flow hedges address the risk associated with future cash flows of interest payments. For all hedges held by us that meet the hedging objectives established by our corporate policy governing interest rate risk management, no net gains or losses were reported in earnings. The changes in fair value of derivative instruments designated as hedge instruments are reflected in accumulated other comprehensive income. For derivative instruments not designated as hedging instruments, the gain or loss, resulting from the change in the estimated fair value of the derivative instruments, is recognized in current earnings during the period of change.
Earnings per Share of the Company	Earnings per Share of the Company The Company presents both basic and diluted earnings per share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for common stock and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPS is computed by dividing the income available to common stockholders by the weighted-average number of common stock shares outstanding for the period. Basic EPS includes participating securities, consisting of unvested restricted stock that receive nonforfeitable dividends similar to shares of common stock. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS amount. Diluted EPS also includes units of limited partnership interest. The dilutive effect of stock options is reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method.
Earnings per Unit of the Operating Partnership	Earnings per Unit of the Operating Partnership The Operating Partnership presents both basic and diluted earnings per unit ("EPU") using the two-class method, which is an earnings allocation formula that determines EPU for common units and any participating securities according to dividends declared (whether paid or unpaid). Under the two-class method, basic EPU is computed by dividing the income available to common unitholders by the weighted-average number of common units outstanding for the period. Basic EPU includes participating securities, consisting of unvested restricted units that receive nonforfeitable dividends similar to shares of common units. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount. The dilutive effect of unit options is reflected in the weighted average diluted outstanding units calculation by application of the treasury stock method.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist primarily of cash investments, debt and preferred equity investments and accounts receivable. We place our cash investments with high quality financial institutions. The collateral securing our debt and preferred equity investments is located in New York City. See Note 5, "Debt and Preferred Equity Investments."
Reclassification	Reclassification Certain prior year balances have been reclassified to conform to our current year presentation. Beginning in the second quarter of 2024, we reclassified amounts recorded for certain right-of-use assets classified as operating leases from a gross presentation above accumulated depreciation to a net presentation below accumulated depreciation in our consolidated balance sheets. This includes reclassifying the related amortization that was previously included in the accumulated depreciation. We believe this presentation enhances the Company's financial statements.
Accounting Standards Updates	Accounting Standards Updates In November 2024, the FASB issued ASU No. 2024-03 Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40). The objective of this amendment is to help investors better understand a public entity's performance, better assess the entity's prospect for future cash flows, and compare the entity's performance over time and with that of other entities. The amendment will require public business entities to include a footnote disclosure about specific expenses by requiring them to disaggregate, in a tabular presentation, each relevant expense caption on the face of the income statement that includes purchases of inventory, employee compensation, depreciation, and intangible asset amortization. For any remaining items within each relevant expense caption, a qualitative disclosure is required for the amounts that are not separately disaggregated quantitatively. Additionally, the amendment provides guidance on the definition of selling expenses along with a requirement to disclose the total amount of selling expenses. The amendment does not change the requirements for the presentation of expenses on the face of the income statement. ASU 2024-03 is effective for annual periods beginning after December 15, 2026. Early adoption is permitted. We are currently evaluating the impact of ASU 2024-03 on our consolidated financial statements, but do not believe the adoption of this standard will have a material impact on our consolidated financial statements. In December 2023, the FASB issued ASU No. 2023-09 Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The objective of the amendments in ASU 2023-09 related to the rate reconciliation and income taxes paid disclosures are to improve transparency of income tax disclosures by requiring consistent categories and greater disaggregation of information in the rate reconciliation, and income taxes paid disaggregated by jurisdiction. The amendment will require that public entities on an annual basis disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. Additionally, the amendment will require that all entities disclose on an annual basis the amount of taxes paid (net of refunds received) disaggregated by federal, state and foreign taxes as well as disaggregated by individual jurisdictions that meet a quantitative threshold. ASU 2023-09 is effective prospectively for annual periods beginning after December 15, 2024. Early adoption and retrospective application is permitted. The Company adopted this guidance on January 1, 2025 and do not believe it will have a material impact on the Company's consolidated financial statements. In November 2023, the FASB issued ASU No. 2023-07 Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. ASU 2023-07 amends the reportable segment disclosure requirements to enhance disclosures about significant segment expenses. The objective of the amendment is to improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities to enable investors to develop more decision-useful financial analyses. The amendment will require that a public entity disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker ("CODM") and included within each reported measure of segment profit or loss (collectively referred to as the "significant expense principle"). Additionally, the amendment will require an entity to disclose an amount for "other segment items" by reportable segment and a description of its composition as well as require all the current annual disclosure requirements in ASC 280 on an interim basis, except for entity-wide disclsoures. Lastly, the amendment will require a public entity to disclose the title and position of the CODM and an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding to allocate resources. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted and should be applied retrospectively to all prior periods presented in the financial statements. The Company adopted this guidance on January 1, 2024 and it did not have a material impact on the Company's consolidated financial statements. In August 2023, the FASB issued ASU No. 2023-05 Business Combinations - Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement. ASU 2023-05 addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture's separate financial statements. The objectives of the amendments are to provide decision-useful information to investors and other allocators of capital in a joint venture's financial statements and reduce diversity in practice. The amendments require that a joint venture apply the following key adaptations from the business combinations guidance upon formation: (i) a joint venture is the formation of a new entity without an accounting acquirer, (ii) a joint venture measures its identifiable net assets and goodwill, if any, at the formation date, (iii) initial measurement of a joint venture's total net assets is equal to the fair value of 100 percent of the joint venture's equity, and (iv) a joint venture provides relevant disclosures. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, with early adoption permitted in any interim or annual period in which financial statements have not yet been issued, either prospectively or retrospectively. The Company adopted this guidance on January 1, 2025 and do not believe it will have a material impact on the Company's consolidated financial statements. In March 2022, the FASB issued ASU No. 2022-02 Financial Instruments - Credit Losses (Topic 326) Troubled Debt Restructurings and Vintage Disclosures. ASU 2022-02 eliminates the troubled debt restructuring recognition and measurement guidance and, instead, requires that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. The amendments enhance existing disclosure requirements and introduce new requirements related to certain modifications of receivables made to borrowers experiencing financial difficulties. Additionally, ASU 2022-02 requires an entity to disclose current-period gross write-offs by year of origination for financing receivables and net investment in leases within the scope of Subtopic 326-20. Gross write-off information must be included in the vintage disclosures required for entities in accordance with Subtopic 326-20, which requires that an entity disclose the amortized cost basis of financing receivables by credit-quality indicator and class of financing receivable by year of origination. ASU 2022-02 is effective for reporting periods beginning after December 15, 2022, including interim periods within those fiscal years, with early adoption permitted. The Company adopted this guidance on January 1, 2023 and it did not have a material impact on the Company's consolidated financial statements.
Fair Value Measurements	Fair Value Measurements We are required to disclose fair value information with regard to certain of our financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practical to estimate fair value. The FASB guidance defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. We measure and/or disclose the estimated fair value of certain financial assets and liabilities based on a hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity and the reporting entity's own assumptions about market participant assumptions. This hierarchy consists of three broad levels: Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date; Level 2 - inputs other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly; and Level 3 - unobservable inputs for the asset or liability that are used when little or no market data is available. We follow this hierarchy for our assets and liabilities measured at fair value on a recurring and nonrecurring basis. In instances in which the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level of input that is significant to the fair value measurement in its entirety. Our assessment of the significance of the particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. We evaluate real estate investments and debt and preferred equity investments, including intangibles, for potential impairment primarily utilizing cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as sales comparison approach, which utilizes comparable sales, listings and sales contracts, all of which are classified as Level 3 inputs. In December 2024, the Company amended the joint venture agreement with its partner in the 100 Park Avenue joint venture. As a result of the amended terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a positive fair value adjustment of $117.8 million, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to December 2024, the investment was accounted for under the equity method. This fair value was determined using a third-party valuation which primarily utilized cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as the sales comparison approach, which utilizes comparable sales, listings, and sales contracts. All of which are classified as Level 3 inputs. In March 2024, the Company entered into an agreement to acquire its partner's 45.0% interest in the 10 East 53rd Street joint venture. As a result of the contract terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a negative fair value adjustment of ($55.7 million), which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to March 2024, the investment was accounted for under the equity method. This fair value was determined using a third-party valuation which primarily utilized cash flow projections that apply, among other things, estimated revenue and expense growth rates, discount rates and capitalization rates, as well as the sales comparison approach, which utilizes comparable sales, listings, and sales contracts. All of which are classified as Level 3 inputs. In June 2023, the Company sold a 49.9% interest in its 245 Park Avenue investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement. Marketable securities classified as Level 1 are derived from quoted prices in active markets. The valuation technique used to measure the fair value of marketable securities classified as Level 2 were valued based on quoted market prices or model driven valuations using the significant inputs derived from or corroborated by observable market data. We do not intend to sell these securities and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The fair value of derivative instruments is based on current market data received from financial sources that trade such instruments and are based on prevailing market data and derived from third party proprietary models based on well-recognized financial principles and reasonable estimates about relevant future market conditions, which are classified as Level 2 inputs. The senior obligations of consolidated securitization vehicles represent CMBS that are not owned by the Company. A majority of these securities are either traded in the marketplace or are similar to other securities that are traded in the marketplace. As the valuation of these amounts are based upon quoted prices for similar instruments in active markets, we generally utilize third party pricing service providers to determine the fair value. The Company evaluates and assesses the third party pricing by referring to recent trades of similar securities, ratings, subordination levels, current market data and credit issues. The Company maximizes the use of observable inputs over unobservable inputs and uses the value of the senior obligations of consolidated securitization vehicles as an indicator of the fair value of the real estate loans held by consolidated securitization vehicles. Depending on the significance of the fair value inputs used in determining the fair value, these securities are classified in either Level 2 or Level 3 of the fair value hierarchy. As such, these investments may move between Level 2 and Level 3 of the fair value hierarchy if the significant fair value inputs used to price the CMBS become or cease to be observable. The fair value of our secured borrowing is determined by projecting future cash flows, which takes into consideration various factors including discount rate and exit capitalization rate, as well as related asset performance and local or macro real estate performance. The inputs used in determining the Company's secured borrowing are considered Level 3. The financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash and cash equivalents, restricted cash, accounts receivable, accounts payable and accrued expenses, debt and preferred equity investments, mortgages and other loans payable and other secured and unsecured debt. The carrying amount of cash and cash equivalents, restricted cash, accounts receivable, and accounts payable and accrued expenses reported in our consolidated balance sheets approximates fair value due to the short-term nature of these instruments. The fair value of debt and preferred equity investments, which is classified as Level 3, is estimated by discounting the future cash flows using current interest rates at which similar loans with the same maturities would be made to borrowers with similar credit ratings. The fair value of borrowings, which is classified as Level 3, is estimated by discounting the contractual cash flows of each debt instrument to their present value using adjusted market interest rates, which is provided by a third-party specialist.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Interests in Investment Properties	On December 31, 2024, we owned the following interests in properties in the New York metropolitan area, primarily in midtown Manhattan. Our investments located outside of Manhattan are referred to as the Suburban properties: Consolidated Unconsolidated Total Location Property Number of Buildings Approximate Square Feet (unaudited) Number of Buildings Approximate Square Feet (unaudited) Number of Buildings Approximate Square Feet (unaudited) Weighted Average Leased Occupancy (1) (unaudited) Commercial: Manhattan Office 15 9,587,441 9 12,175,149 24 21,762,590 92.5 % Retail 2 30,496 1 12,946 3 43,442 100.0 % Development/Redevelopment 2 (2) 880,771 1 1,385,484 3 2,266,255 N/A 19 10,498,708 11 13,573,579 30 24,072,287 92.5 % Suburban Office 7 862,800 — — 7 862,800 73.5 % Total commercial properties 26 11,361,508 11 13,573,579 37 24,935,087 91.8 % Residential: Manhattan Residential 1 (2) 140,382 1 221,884 2 362,266 99.1 % Total core portfolio 27 11,501,890 12 13,795,463 39 25,297,353 91.9 % Alternative Strategy Portfolio — — 7 2,567,025 7 2,567,025 63.0 % (1) The weighted average leased occupancy for commercial properties represents the total leased square feet divided by total square footage at acquisition. The weighted average leased occupancy for residential properties represents the total leased units divided by total available units. Properties under construction are not included in the calculation of weighted average leased occupancy. (2) As of December 31, 2024, we owned a building at 7 Dey Street / 185 Broadway that was comprised of approximately 140,382 square feet (unaudited) of residential space and approximately 50,206 square feet (unaudited) of office and retail space that is under development. For the purpose of this report, we have included this building in the number of residential properties we own. However, we have included only the residential square footage in the residential approximate square footage, and have listed the balance of the square footage as development square footage.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Schedule of Estimated Useful Lives	Properties other than Right of use assets - operating leases are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Category Term Building (fee ownership) 40 years Building improvements shorter of remaining life of the building or useful life Building (leasehold interest) lesser of 40 years or remaining term of the lease Right of use assets - financing leases lesser of 40 years or remaining term of the lease Furniture and fixtures 4 to 7 years Tenant improvements shorter of remaining term of the lease or useful life
Schedule of Identified Intangible Assets and Intangible Liabilities	The following summarizes our identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-market leases) as of December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Identified intangible assets (included in other assets): Gross amount $ 378,277 $ 189,680 Accumulated amortization (197,211) (184,902) Net $ 181,066 $ 4,778 Identified intangible liabilities (included in deferred revenue): Gross amount $ 243,703 $ 205,394 Accumulated amortization (204,092) (202,089) Net $ 39,611 $ 3,305
Schedule of Estimated Annual Amortization of Acquired Above-market Leases, Net of Acquired Below-market Leases	The estimated annual amortization of acquired above-market leases, net of acquired (below-market) leases (a component of rental revenue), for each of the five succeeding years is as follows (in thousands): 2025 $ 5,828 2026 5,265 2027 4,754 2028 4,058 2029 3,719
Schedule of Estimated Annual Amortization of all Other Identifiable Assets	The estimated annual amortization of all other identifiable assets (a component of depreciation and amortization expense) including tenant improvements for each of the five succeeding years is as follows (in thousands): 2025 $ 30,485 2026 26,943 2027 21,648 2028 16,492 2029 15,008
Schedule of Marketable Securities	As of December 31, 2024 and 2023, we held the following marketable securities (in thousands): December 31, 2024 December 31, 2023 Commercial mortgage-backed securities - available-for-sale $ 17,323 $ 9,591 Commercial mortgage-backed securities - held-to-maturity 5,489 — Total investment in marketable securities $ 22,812 $ 9,591
Schedule of Real Estate CMBS Securitization Trusts	As of December 31, 2024 and 2023, we consolidated the following CMBS securitization trusts (in thousands): December 31, 2024 December 31, 2023 Maturity Type Fair Value (1) Principal Value Fair Value Principal Value Real estate loans held by consolidated securitization vehicles $ 709,095 $ 894,000 $ — $ — 2023 - 2024 (2) Senior obligations of consolidated securitization vehicles 590,131 688,346 — — 2023 - 2024 (2) Real estate loans held by consolidated securitization vehicles in excess of senior obligations of consolidated securitization vehicles $ 118,964 $ 205,654 $ — $ — (1) Includes $134.8 million and $34.2 million of assets and liabilities, respectively, for a loan that is on non-accrual and is accounted for on an amortized cost basis. (2) The Company is in discussions with the respective borrowers on the resolution of the past maturities.
Schedule of Properties Contributed of Annualized Cash Rent	For the years ended December 31, 2024, 2023, and 2022, the following properties contributed more than 5.0% of our annualized cash rent from office properties, including our share of annualized cash rent from joint venture office properties: Property 2024 Property 2023 Property 2022 One Vanderbilt Avenue 14.7% One Vanderbilt Avenue 16.0% One Vanderbilt Avenue 14.1% 11 Madison Avenue 8.8% 11 Madison Avenue 8.3% 245 Park Avenue 10.0% 420 Lexington Avenue 7.0% 420 Lexington Avenue 6.7% 11 Madison Avenue 7.8% 1515 Broadway 6.7% 1515 Broadway 6.4% 420 Lexington Avenue 6.3% 245 Park Avenue 6.7% 1185 Avenue of the Americas 5.6% 1515 Broadway 5.8% 1185 Avenue of the Americas 5.9% 280 Park Avenue 5.5% 1185 Avenue of the Americas 5.1% 280 Park Avenue 5.2% 245 Park Avenue 5.5% 280 Park Avenue 5.1%

Property Acquisitions and Con_2

Property Acquisitions and Consolidations (Tables)	12 Months Ended
	Dec. 31, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Properties Acquired	The following table summarizes the properties consolidated during the year ended December 31, 2024: Property Consolidation Date Property Type Approximate Square Feet Gross Asset Valuation 100 Park Avenue (1) December 2024 Fee Interest 834,000 $ 441.0 10 East 53rd Street (2) March 2024 Fee Interest 354,300 236.0 (1) In December 2024, the Company amended the joint venture agreement with its partner. As a result of the amended terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a positive fair value adjustment of $117.8 million, which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to December 2024, the investment was accounted for under the equity method. See Note 16, "Fair Value Measurements." (2) In March 2024, the Company entered into an agreement to acquire its partner's 45.0% interest in the joint venture for cash consideration of $7.2 million, which is net of all outstanding debt obligations at contract signing. As a result of the contract terms, it was concluded that the joint venture is a VIE in which the Company is the primary beneficiary, and the investment was consolidated in our financial statements. Upon consolidating the entity, the assets and liabilities of the entity were recorded at fair value which resulted in the recognition of a negative fair value adjustment of ($55.7 million), which is included in Purchase price and other fair value adjustments in the consolidated statements of operations. Prior to March 2024, the investment was accounted for under the equity method. In December 2024, the Company closed on the acquisition of the partner's interest. See Note 16, "Fair Value Measurements." The following table summarizes the properties acquired during the year ended December 31, 2022: Property Acquisition Date Property Type Approximate Square Feet Gross Asset Valuation 245 Park Avenue (1) September 2022 Fee Interest 1,782,793 $ 1,960.0 (1) On October 31, 2021, HNA, through an affiliated entity, filed for Chapter 11 bankruptcy protection on account of its investment in 245 Park Avenue, together with another asset in Chicago. On July 8, 2022, certain of the debtors and affiliates of SL Green entered into a Plan Sponsorship and Investment Agreement (the "Plan"). Since the debtors did not receive any qualifying bids for the property and the Plan was confirmed, SL Green acquired full ownership and control of the property in September 2022, at which time our outstanding preferred equity and accrued interest balance were credited to our equity investment in the property. We recorded the assets acquired and liabilities assumed at fair value.

Properties Held for Sale and _2

Properties Held for Sale and Property Dispositions (Tables)	12 Months Ended
	Dec. 31, 2024
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Properties Sold	The following table summarizes the properties sold during the years ended December 31, 2024, 2023, and 2022: Property Disposition Date Property Type Unaudited Approximate Usable Square Feet Sales Price (1) (in millions) (Loss) Gain on Sale (2) (in millions) Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units) (3) December 2024 Fee Interest 13,590 $ 63.5 $ (1.5) Palisades Premier Conference Center July 2024 Fee Interest 450,000 26.3 7.3 719 Seventh Avenue June 2024 Fee Interest 10,040 30.5 (2.0) 245 Park Avenue (4) June 2023 Fee Interest 1,782,793 1,995.0 (28.3) 885 Third Avenue - Office Condominium Units (5) December 2022 Fee / Leasehold Interest 414,317 300.4 (24.0) 609 Fifth Avenue June 2022 Fee Interest 138,563 100.5 (80.2) 1591-1597 Broadway May 2022 Fee Interest 7,684 121.0 (4.5) 1080 Amsterdam Avenue April 2022 Leasehold Interest 85,250 42.7 17.9 707 Eleventh Avenue February 2022 Fee Interest 159,720 95.0 (0.8) (1) Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property. (2) The (losses) gains on sale are net of $5.1 million, $11.3 million, and $11.2 million of employee compensation accrued in connection with the realization of the investment dispositions during the years ended December 31, 2024, 2023, and 2022, respectively. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) The remaining condominium units at 760 Madison are under contract and expected to close once completed in the first quarter of 2025. (4) In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our retained investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) that is reflected in the Company's consolidated statements of operations within Purchase price and other fair value adjustments. See Note 6, "Investments in Unconsolidated Joint Venture" and Note 16, " Fair Value Measurements." (5) In December 2022, the Company sold 414,317 square feet of office leasehold condominium units at the property. The Company retained the remaining 218,796 square feet of the building.

Debt and Preferred Equity Inv_2

Debt and Preferred Equity Investments (Tables)	12 Months Ended
	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Activity in Debt and Preferred Equity Investments	Below is a summary of the activity in our debt and preferred equity investments for the years ended December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Balance at beginning of year (1) $ 346,745 $ 623,280 Debt investment originations/fundings/accretion (2) 12,890 72,160 Preferred equity investment originations/accretion (2) (3) 8,720 8,142 Redemptions/sales/syndications/equity ownership/amortization (64,629) (349,947) Net change in loan loss reserves — (6,890) Balance at end of period (1) (4) $ 303,726 $ 346,745 (1) Net of unamortized fees, discounts, and premiums. (2) Accretion includes amortization of fees and discounts and paid-in-kind investment income. (3) Excludes a $214.7 million preferred equity investment that is included in Investment in unconsolidated joint ventures in our consolidated balance sheet. See Note 6, "Investments in Unconsolidated Joint Ventures." (4) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio.
Schedule of Debt and Preferred Equity Investments	Below is a summary of our debt and preferred equity investments as of December 31, 2024 (dollars in thousands): Floating Rate Fixed Rate Total Carrying Value Senior Financing Maturity (2) Type Carrying Value Face Value Interest Rate (1) Carrying Value Face Value Interest Rate Mezzanine Debt $ 117,006 $ 117,160 S + 5.06 - 11.75% $ 50,000 $ 50,000 8.00 - 8.40% $ 167,006 (3) $ 812,021 2025 - 2029 Preferred Equity (4) — — — 136,720 136,720 6.5% 136,720 250,000 2027 Balance at end of period $ 117,006 $ 117,160 $ 186,720 $ 186,720 $ 303,726 $ 1,062,021 (1) Floating interest rates are presented with the stated spread over Term SOFR ("S"). (2) Excludes available extension options to the extent they have not been exercised as of the date of this filing. (3) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio. (4) Excludes a $214.7 million preferred equity investment that is included in Investment in unconsolidated joint ventures in our consolidated balance sheet. See Note 6, "Investments in Unconsolidated Joint Ventures."
Schedule of Roll Forward of our Total Allowance for Loan Losses	The following table is a roll forward of our total allowance for loan losses for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, 2024 2023 2022 Balance at beginning of year $ 13,520 $ 6,630 $ 6,630 Current period provision for loan loss — 6,890 — Balance at end of period $ 13,520 (1) $ 13,520 (1) $ 6,630 (1) As of December 31, 2024, all financing receivables on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $53.5 million, which is included in the Company's alternative strategy portfolio.
Schedule of Carrying Value of Debt and Preferred Equity Investment Portfolio by Year of Origination and Risk Rating	The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of December 31, 2024 and 2023 (dollars in thousands): Risk Rating December 31, 2024 December 31, 2023 1 - Low Risk Assets - Low probability of loss $ 156,720 $ 210,333 2 - Watch List Assets - Higher potential for loss (1) 147,006 136,412 3 - High Risk Assets - Loss more likely than not — — $ 303,726 $ 346,745 (1) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio. The following table sets forth the carrying value of our debt and preferred equity investment portfolio by year of origination and risk rating as of December 31, 2024 (dollars in thousands): As of December 31, Risk Rating 2024 (1) 2023 (1) 2022 (1) Prior (1)(2) Total 1 - Low Risk Assets - Low probability of loss $ — $ — $ — $ 156,720 $ 156,720 2 - Watch List Assets - Higher potential for loss — — — 147,006 (3) 147,006 3 - High Risk Assets - Loss more likely than not — — — — — $ — $ — $ — $ 303,726 $ 303,726 (1) Year in which the investment was originated or acquired by us or in which a material modification occurred. (2) During the year ended December 31, 2023, we recognized a $6.9 million provision for loan loss related to an investment originated prior to 2021. (3) Includes two investments with a total carrying value of $53.5 million that are included in the Company's alternative strategy portfolio.
Schedule of Debt Investments with an Aggregate Weighted Average Current Yield	As of December 31, 2024 and 2023, we held the following debt investments with an aggregate weighted average current yield of 6.02% as of December 31, 2024 (dollars in thousands): December 31, 2024 December 31, 2023 Loan Type Future Funding Obligations Senior Financing Carrying Value (1) Carrying Value (1) Maturity Date (2) Fixed Rate Investments: Mezzanine Loan (3) (4) (5) $ — $ 105,000 $ 13,366 $ 13,366 January 2025 Mezzanine Loan (6) — 95,000 30,000 30,000 January 2025 Mezzanine Loan — 85,000 20,000 20,000 December 2029 Total fixed rate $ — $ 285,000 $ 63,366 $ 63,366 Floating Rate Investments: Mezzanine Loan $ — $ 54,000 $ 8,991 $ 8,243 July 2025 Mezzanine Loan (5) (7) — 283,000 53,687 50,000 December 2025 Mezzanine Loan 4,603 190,021 54,482 48,323 January 2026 Mezzanine Loan — — — 62,333 May 2024 Total floating rate $ 4,603 $ 527,021 $ 117,160 $ 168,899 Allowance for loan loss $ — $ — $ (13,520) $ (13,520) Total $ 4,603 $ 812,021 $ 167,006 $ 218,745 (1) Carrying value is net of discounts, premiums, original issue discounts and deferred origination fees. (2) Represents contractual maturity, excluding any extension options to the extent they have not been exercised as of the date of this filing. (3) Carrying value is net of a $12.0 million participation that was sold and did not meet the conditions for sale accounting, which is included in Other assets and Other liabilities on the consolidated balance sheets. (4) This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of December 31, 2024. No investment income has been recognized subsequent to it being put on non-accrual. In the first quarter of 2023, the Company fully reserved the balance of the investment. Additionally, we determined the borrower entity to be a VIE in which we are not the primary beneficiary. (5) Included in the Company's alternative strategy portfolio. (6) The Company is in discussions with the borrower with respect to the loan. (7) This loan was put on non-accrual in January 2023 and remains on non-accrual as of December 31, 2024. No investment income has been recognized since it was put on non-accrual. In December 2024, the maturity date of the loan was extended to December 2025. Additionally, we determined the borrower entity to be a VIE in which we are not the primary beneficiary.
Schedule of Preferred Equity Investments with an Aggregate Weighted Average Current Yield	As of December 31, 2024 and 2023, we held the following preferred equity investments with an aggregate weighted average current yield of 6.55% as of December 31, 2024 (dollars in thousands), excluding a $214.7 million preferred equity investment that is included in Investment in unconsolidated joint ventures in our consolidated balance sheet: December 31, 2024 December 31, 2023 Type Future Funding Senior Carrying Value (1) Carrying Value (1) Mandatory Redemption (2) Preferred Equity $ — $ 250,000 $ 136,720 $ 128,000 February 2027 Total $ — $ 250,000 $ 136,720 $ 128,000 (1) Carrying value is net of deferred origination fees. (2) Represents contractual redemption, excluding any unexercised extension options.

Investments in Unconsolidated_2

Investments in Unconsolidated Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2024
Equity Method Investments and Joint Ventures [Abstract]
Schedule of General Information on Joint Ventures and Investments in Unconsolidated Joint Ventures Sold	The table below provides general information on each of our joint ventures as of December 31, 2024: Property Partner Economic Interest (1) Unaudited Approximate Square Feet 800 Third Avenue Private Investors 60.52% 526,000 919 Third Avenue New York State Teacher's Retirement System 51.00% 1,454,000 11 West 34th Street (2) Private Investor / Wharton Properties 30.00% 17,150 280 Park Avenue Vornado Realty Trust 50.00% 1,219,158 1552-1560 Broadway (2) (3) Wharton Properties 50.00% 57,718 650 Fifth Avenue (2) (4) Wharton Properties 50.00% 69,214 11 Madison Avenue PGIM Real Estate 60.00% 2,314,000 One Vanderbilt Avenue (5) National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd 60.01% 1,657,198 Worldwide Plaza (2) (6) RXR Realty / New York REIT 24.95% 2,048,725 1515 Broadway Allianz Real Estate of America 56.87% 1,750,000 2 Herald Square (2) (7) (8) Israeli Institutional Investor 95.00% 369,000 115 Spring Street (2) (9) Private Investor 51.00% 5,218 15 Beekman (10) A fund managed by Meritz Alternative Investment Management 20.00% 221,884 85 Fifth Avenue (11) Wells Fargo 36.27% 12,946 One Madison Avenue (12) National Pension Service of Korea / Hines Interest LP / International Investor 25.50% 1,048,700 220 East 42nd Street A fund managed by Meritz Alternative Investment Management 51.00% 1,135,000 450 Park Avenue (13) Korean Institutional Investor / Israeli Institutional Investor 25.10% 337,000 245 Park Avenue (14) U.S. Affiliate of Mori Trust Co., Ltd 50.10% 1,782,793 625 Madison Avenue (15) Private Investor 90.93% 563,000 (1) Economic interest represent the Company's interests in the joint venture as of December 31, 2024. Changes in economic interests within the current year are disclosed in the notes below. (2) Included in the Company's alternative strategy portfolio. (3) The joint venture owns a long-term leasehold interest in the retail space and certain other spaces at 1560 Broadway, which is adjacent to 1552 Broadway. In December 2023, following an assessment of the investment for recoverability, the Company recorded a charge of $8.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. (4) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. (5) In November 2024, the Company sold an additional 11% interest in the joint venture. The Company retained a 60.01% ownership interest in the investment and recognized a $187.6 million gain in Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate. (6) In December 2024, following an assessment of the investment for recoverability, the Company recorded a charge of $72.6 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (7) In December 2023, following an assessment of the property and the investment for recoverability, the Company recorded a charge of $101.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. In January 2024, the Company closed on the acquisition of interests in the joint venture that owns the leasehold interest for no consideration, which increases the Company's interest in the joint venture to 95.0%. In addition, in February 2024, the joint venture settled the previously existing $182.5 million mortgage on the property for a net payment of $7.0 million. (8) In December 2024, following an assessment of the investment for recoverability, the Company recorded a charge of $20.4 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (9) In December 2024, following an assessment of the property for recoverability, the Company recognized a charge of $11.7 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (10) In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company. (11) In December 2024, following an assessment of the property and investment for recoverability, the Company recorded a charge of $12.0 million, which is included in Equity in net loss from unconsolidated joint ventures in the consolidated statements of operations. (12) In 2021, the Company admitted an additional partner to the development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets at December 31, 2024 and 2023. (13) The 25.1% economic interest reflected in this table excludes a 25.0% economic interest held by a third party. The third-party's economic interest is held in a joint venture that we consolidate as a 50.1% ownership interest. The third-party's 25.0% economic interest is recognized in Noncontrolling interests in other partnerships on our consolidated balance sheet. A separate third-party owns the remaining 49.9% economic interest in the property. (14) In June 2023, the Company sold a 49.9% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and deconsolidation of the 50.1% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of ($17.0 million) during the year ended December 31, 2023. The fair value of our investment was determined by the terms of the joint venture agreement. (15) In September 2023, following a UCC foreclosure, the Company converted its previous mezzanine debt investments in the fee interest to a 90.43% ownership interest. See Note 5, "Debt and Preferred Equity Investments." In December 2023, together with its joint venture partner, the Company entered into a contract to sell the fee ownership in the property. In connection with this contract, the Company recorded a charge of $23.1 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. In connection with the sale, which closed in May 2024, the Company, together with its joint venture partner, originated a $235.4 million preferred equity investment in the property with a mandatory redemption date of December 2026. The Company's share, net of unamortized discounts, is $214.7 million with an aggregate weighted average current yield of 8.86% as of December 31, 2024. The following table summarizes the investments in unconsolidated joint ventures sold during the years ended December 31, 2024, 2023, and 2022: Property Ownership Interest Sold Disposition Date Gross Asset Valuation Gain (Loss) on Sale (in millions) (1) (2) One Vanderbilt Avenue 11.00% November 2024 $ 4,700.0 $ 187.6 625 Madison Avenue (3) 90.43% May 2024 634.6 (7.6) 717 Fifth Avenue 10.92% January 2024 963.0 26.9 21 East 66th Street 32.28% December 2023 40.6 (12.7) 121 Greene Street 50.00% February 2023 14.0 (0.3) Stonehenge Portfolio Various April 2022 1.0 — (1) Represents the Company's share of the gain or loss (2) For the years ended December 31, 2024 and December 31, 2023, the (losses) gains on sale are net of $16.8 million and $2.0 million, respectively, of employee compensation accrued in connection with the realization of the investment dispositions. There was no amount accrued for employee compensation in the year ended December 31, 2022. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) In connection with the sale of the fee ownership interest, the Company, together with its joint venture partner, originated a $235.4 million preferred equity investment in the property with a mandatory redemption date of December 2026. The Company's share, net of unamortized discounts, is $214.7 million with an aggregate weighted average current yield of 8.86% as of December 31, 2024. Prior to the completion of the sale, the Company recorded a charge of $5.9 million for capital contributions required during the three months ended March 31, 2024 while the investment was under contract, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations
Schedule of Mortgage Notes and Other Loans Payable Collateralized by the Respective Joint Venture Properties and Assignment of Leases	The mortgage notes and other loans payable collateralized by the respective joint venture properties and assignment of leases as of December 31, 2024 and 2023, respectively, are as follows (dollars in thousands): Principal Outstanding Principal Outstanding Economic Current Maturity Final Maturity Interest December 31, 2024 December 31, 2023 Property Interest (1) Date Date (2) Rate (3) Gross SLG Share Gross SLG Share Fixed Rate Debt: 650 Fifth Avenue (4) 50.00 % February 2025 (5) July 2025 5.45% $ 65,000 $ 32,500 $ 65,000 $ 32,500 115 Spring Street (4) 51.00 % March 2025 March 2025 5.50% 65,550 33,431 65,550 33,431 450 Park Avenue 25.10 % June 2025 June 2027 6.10% 284,835 71,494 271,394 68,120 11 Madison Avenue 60.00 % September 2025 September 2025 3.84% 1,400,000 840,000 1,400,000 840,000 15 Beekman 20.00 % January 2026 January 2028 5.99% 120,000 24,000 — — 800 Third Avenue 60.52 % February 2026 February 2026 3.37% 177,000 107,120 177,000 107,120 1515 Broadway 56.87 % March 2026 March 2028 3.93% 740,947 421,369 762,002 433,344 919 Third Avenue 51.00 % April 2026 April 2028 6.11% 500,000 255,000 500,000 255,000 280 Park Avenue 50.00 % September 2026 September 2028 5.84% 1,075,000 537,500 — — 245 Park Avenue 50.10 % June 2027 June 2027 4.30% 1,768,000 885,768 1,768,000 885,768 One Madison Avenue (6) 25.50 % November 2027 November 2027 7.10% 658,357 167,881 733,103 186,941 Worldwide Plaza (4) 24.95 % November 2027 November 2027 3.98% 1,200,000 299,400 1,200,000 299,400 220 East 42nd Street 51.00 % December 2027 December 2027 6.77% 496,412 253,170 505,412 257,760 One Vanderbilt Avenue 60.01 % July 2031 July 2031 2.95% 3,000,000 1,800,300 3,000,000 2,130,300 5 Times Square (7) — — 477,783 150,740 625 Madison Avenue — — 199,987 180,848 10 East 53rd Street — — 220,000 121,000 717 Fifth Avenue — — 655,328 71,536 Total fixed rate debt $ 11,551,101 $ 5,728,933 $ 12,000,559 $ 6,053,808 Floating Rate Debt: 11 West 34th Street (4) 30.00 % February 2023 (8) February 2023 (8) L+ 1.45% $ 23,000 $ 6,900 $ 23,000 $ 6,900 1552 Broadway (4) 50.00 % February 2024 (9) February 2024 (9) S+ 2.75% 193,132 96,566 193,133 96,567 650 Fifth Avenue (4) 50.00 % February 2025 (5) July 2025 S+ 2.25% 210,000 105,000 210,000 105,000 One Madison Avenue (6) 25.50 % November 2027 November 2027 S+ 3.10% 354,757 90,463 — — 100 Park Avenue — — 360,000 179,640 5 Times Square (7) — — 610,010 192,458 280 Park Avenue — — 1,200,000 600,000 2 Herald Square — — 182,500 93,075 15 Beekman — — 124,137 24,827 Total floating rate debt $ 780,889 $ 298,929 $ 2,902,780 $ 1,298,467 Total joint venture mortgages and other loans payable $ 12,331,990 $ 6,027,862 $ 14,903,339 $ 7,352,275 Deferred financing costs, net (97,729) (49,058) (104,062) (54,865) Total joint venture mortgages and other loans payable, net $ 12,234,261 $ 5,978,804 $ 14,799,277 $ 7,297,410 (1) Economic interest represents the Company's interests in the joint venture as of December 31, 2024. Changes in ownership or economic interests, if any, within the current year are disclosed in the notes to the investment in unconsolidated joint ventures table above. (2) Reflects exercise of all available extension options. The ability to exercise extension options may be subject to certain conditions, including the operating performance of the property. (3) Interest rates as of December 31, 2024, taking into account interest rate hedges at the joint venture. Corporate interest rate hedges are not taken into consideration. Floating rate debt is presented with the stated spread over Term SOFR ("S"). (4) Included in the Company's alternative strategy portfolio. (5) In February 2025, the maturity date of the loan was extended to July 2025. (6) The loan is a $1.25 billion construction facility, which was fully extended to November 2027. Advances under the loan are subject to costs incurred. In conjunction with the loan, the Company provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics. (7) In the fourth quarter of 2024, the Company recorded a $146.4 million charge, which is included in Equity in net loss from unconsolidated joint ventures. The Company no longer has an ownership interest in the property. (8) The Company's joint venture partner is in discussions with the lender on resolution of the past maturity. (9) The Company is in discussions with the lender on resolution of the past maturity.
Schedule of Combined Balance Sheets for the Unconsolidated Joint Ventures	The combined balance sheets for the unconsolidated joint ventures, as of December 31, 2024 and 2023, are as follows (in thousands): December 31, 2024 December 31, 2023 Assets (1) Commercial real estate property, net $ 15,327,542 $ 17,561,406 Cash and restricted cash 649,426 656,038 Tenant and other receivables, related party receivables, and deferred rents receivable 621,748 673,532 Debt and preferred equity investments, net 236,512 — Right-of-use assets 919,658 905,934 Other assets 1,739,549 2,584,765 Total assets $ 19,494,435 $ 22,381,675 Liabilities and equity (1) Mortgages and other loans payable, net $ 12,234,261 $ 14,799,277 Deferred revenue 956,217 1,108,180 Lease liabilities 1,008,085 990,276 Other liabilities 519,582 447,705 Equity 4,776,290 5,036,237 Total liabilities and equity $ 19,494,435 $ 22,381,675 Company's investments in unconsolidated joint ventures $ 2,690,138 $ 2,983,313 (1) As of December 31, 2024, $480.8 million of net unamortized basis differences between the amount at which our investments are carried and our share of equity in net assets of the underlying property will be amortized through equity in net income (loss) from unconsolidated joint ventures over the remaining life of the underlying items having given rise to the differences.
Schedule of Combined Statements of Income for the Unconsolidated Joint Ventures	The combined statements of operations for the unconsolidated joint ventures, from acquisition date through the years ended December 31, 2024, 2023, and 2022 are as follows (unaudited, in thousands): Year Ended December 31, 2024 2023 2022 Total revenues $ 1,484,459 $ 1,525,044 $ 1,339,364 Operating expenses 259,558 253,630 240,002 Real estate taxes 297,520 287,462 252,806 Operating lease rent 33,207 29,048 26,152 Interest expense, net of interest income 573,148 574,032 431,865 Amortization of deferred financing costs 21,289 28,157 27,754 Depreciation and amortization 538,390 516,466 465,100 Total expenses $ 1,723,112 $ 1,688,795 $ 1,443,679 Gain (loss) on early extinguishment of debt 233,704 — (467) Depreciable real estate reserves and impairments (181,798) — — Net loss before gain (loss) on sale $ (186,747) $ (163,751) $ (104,782) Company's equity in net loss from unconsolidated joint ventures $ (179,695) $ (76,509) $ (57,958)

Deferred Costs (Tables)

Deferred Costs (Tables)	12 Months Ended
	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Deferred Costs	Deferred costs as of December 31, 2024 and 2023 consisted of the following (in thousands): December 31, 2024 December 31, 2023 Deferred leasing costs $ 426,055 $ 399,224 Less: accumulated amortization (308,923) (287,761) Deferred costs, net $ 117,132 $ 111,463

Mortgages and Other Loans Pay_2

Mortgages and Other Loans Payable (Tables)	12 Months Ended
	Dec. 31, 2024
Mortgages and Other Loans Payable
Schedule of Mortgages and Other Loans Payable	The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2024 and 2023, respectively, were as follows (dollars in thousands): Property Current Maturity Date Final Maturity Date (1) Interest Rate (2) December 31, 2024 December 31, 2023 Fixed Rate Debt: 10 East 53rd Street May 2025 May 2028 5.45% $ 205,000 $ — 100 Church Street June 2025 June 2027 5.89% 370,000 370,000 7 Dey / 185 Broadway November 2025 November 2026 6.65% 190,148 190,148 Landmark Square January 2027 January 2027 4.90% 100,000 100,000 485 Lexington Avenue February 2027 February 2027 4.25% 450,000 450,000 420 Lexington Avenue October 2040 October 2040 8.24% 272,326 277,238 Total fixed rate debt $ 1,587,474 $ 1,387,386 Floating Rate Debt: CMBS Repurchase Facility June 2025 June 2025 S+ 1.75% $ 3,550 $ — 100 Park Avenue June 2025 December 2027 S+ 2.25% 360,000 — 690 Madison Avenue — 60,000 719 Seventh Avenue — 50,000 Total floating rate debt $ 363,550 $ 110,000 Total mortgages and other loans payable $ 1,951,024 $ 1,497,386 Deferred financing costs, net of amortization (6,389) (6,067) Total mortgages and other loans payable, net $ 1,944,635 $ 1,491,319 (1) Reflects exercise of all available extension options. The ability to exercise extension options may be subject to certain conditions, including the operating performance of the property. (2) Interest rate as of December 31, 2024, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over Term SOFR ("S"), unless otherwise specified.

Corporate Indebtedness (Tables)

Corporate Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of senior unsecured notes and other related disclosures by scheduled maturity date	The following table sets forth our senior unsecured notes and other related disclosures as of December 31, 2024 and 2023, respectively, by scheduled maturity date (dollars in thousands): December 31, 2024 December 31, 2023 Issuance Unpaid Principal Balance Accreted Accreted Interest Rate (1) Initial Term Maturity Date December 17, 2015 (2) $ 100,000 $ 100,000 $ 100,000 4.27 % 10 December 2025 $ 100,000 $ 100,000 $ 100,000 Deferred financing costs, net — (103) (205) $ 100,000 $ 99,897 $ 99,795 (1) Interest rate as of December 31, 2024. (2) Issued by the Company and the Operating Partnership as co-obligors in a private placement.
Schedule of combined aggregate principal maturities	Combined aggregate principal maturities of mortgages and other loans payable, the 2021 credit facility, trust preferred securities, senior unsecured notes and our share of joint venture debt as of December 31, 2024, including as-of-right extension options but excluding other extension options, were as follows (in thousands): Scheduled Principal Revolving Unsecured Term Loans Trust Senior Total Company's Share of Joint 2025 — 373,551 — — — 100,000 $ 473,551 1,198,400 2026 — 190,148 — 100,000 — — 290,148 936,639 2027 — 910,000 320,000 1,050,000 — — 2,280,000 1,710,229 2028 — 205,000 — — — — 205,000 382,294 2029 — — — — — — — — Thereafter — 272,325 — — 100,000 — 372,325 1,800,300 Total $ — $ 1,951,024 $ 320,000 $ 1,150,000 $ 100,000 $ 100,000 $ 3,621,024 $ 6,027,862
Schedule of consolidated interest expense, excluding capitalized interest	Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Year Ended December 31, 2024 2023 2022 Interest expense before capitalized interest $ 196,334 $ 228,840 $ 166,493 Interest on financing leases 4,502 4,446 4,555 Capitalized interest (50,148) (95,980) (82,444) Amortization of discount on assumed debt 494 2,842 1,855 Interest income (3,962) (3,034) (986) Interest expense, net $ 147,220 $ 137,114 $ 89,473

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2024
Related Party Transactions [Abstract]
Schedule of amounts due from/to related parties	Amounts due from joint ventures, inclusive of our ownership share of the joint ventures, and related parties as of December 31, 2024 and 2023 consisted of the following (in thousands): December 31, 2024 December 31, 2023 Due from joint ventures $ 19,199 $ 10,603 Other 7,666 1,565 Related party receivables $ 26,865 $ 12,168

Noncontrolling Interests on t_2

Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Schedule of noncontrolling interest	Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for the years ended December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Balance at beginning of period $ 238,051 $ 269,993 Distributions (13,915) (14,779) Issuance of common units 20,790 25,365 Redemption and conversion of common units (28,663) (18,589) Net income (loss) 497 (37,465) Accumulated other comprehensive income (loss) allocation 151 (1,960) Fair value adjustment 72,030 15,486 Balance at end of period $ 288,941 $ 238,051
Schedule of preferred unit activity	Below is a summary of the preferred units of limited partnership interest in the Operating Partnership as of December 31, 2024: Issuance Stated Distribution Rate Number of Units Authorized Number of Units Issued Number of Units Outstanding Annual Dividend Per Unit (1) Liquidation Preference Per Unit (2) Conversion Price Per Unit (3) Date of Issuance Series A (4) 6.00 % 109,161 109,161 109,161 $ 60.0000 $ 1,000.00 $ — August 2015 Series F 7.00 % 60 60 60 70.0000 1,000.00 29.12 January 2007 Series K 3.50 % 700,000 563,954 341,677 0.8750 25.00 134.67 August 2014 Series L 4.00 % 500,000 378,634 272,783 1.0000 25.00 — August 2014 Series R 3.50 % 400,000 400,000 400,000 0.8750 25.00 154.89 August 2015 Series S 4.00 % 1,077,280 1,077,280 1,077,280 1.0000 25.00 — August 2015 Series V (5) 5.00 % 40,000 40,000 40,000 1.2500 25.00 — May 2019 Series W (6) (6) 1 1 1 (6) (6) (6) January 2020 (1) Dividends are cumulative, subject to certain provisions. (2) Units are redeemable at any time at par for cash at the option of the unit holder unless otherwise specified. (3) If applicable, units are convertible into a number of common units of limited partnership interest in the Operating Partnership equal to (i) the liquidation preference plus accumulated and unpaid distributions on the conversion date divided by (ii) the amount shown in the table. (4) Issued through a consolidated subsidiary. The units are redeemable at any time after December 13, 2024 at par for cash at the option of the unit holder. (5) The Series V Preferred Units are redeemable at any time after January 1, 2025 at par for cash at the option of the unit holder. (6) The Series W preferred unit was issued in January 2020 in exchange for the then-outstanding Series O preferred unit. The holder of the Series W preferred unit is entitled to quarterly dividends in an amount calculated as (i) 1,350 multiplied by (ii) the current distribution per common unit of limited partnership in SL Green Operating Partnership. The holder has the right to require the Operating Partnership to repurchase the Series W unit for cash, or convert the Series W unit for Class B units, in each case at a price that is determined based on the closing price of the Company's common stock at the time such right is exercised. The unit's liquidation preference is the fair market value of the unit plus accrued distributions at the time of a liquidation event. Below is a summary of the activity relating to the preferred units in the Operating Partnership for the years ended December 31, 2024 and 2023 (in thousands): December 31, 2024 December 31, 2023 Balance at beginning of period $ 166,501 $ 177,943 Issuance of preferred units — — Redemption of preferred 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

Stockholders' Equity of the C_2

Stockholders' Equity of the Company (Tables)	12 Months Ended
	Dec. 31, 2024
Stockholders' Equity Note [Abstract]
Schedule of common stock issued and proceeds received dividend reinvestments	The following table summarizes SL Green common stock issued, and proceeds received from dividend reinvestments and/or stock purchases under the DRSPP for the years ended December 31, 2024, 2023, and 2022, respectively (dollars in thousands): Year Ended December 31, 2024 2023 2022 Shares of common stock issued 728,352 17,180 10,839 Dividend reinvestments/stock purchases under the DRSPP $ 52,308 $ 525 $ 525
Schedule of earnings per share	SL Green's earnings per share for the years ended December 31, 2024, 2023, and 2022 are computed as follows (in thousands): Year Ended December 31, Numerator 2024 2023 2022 Basic Earnings: Income (loss) attributable to SL Green common stockholders $ 7,060 $ (579,509) $ (93,024) Less: distributed earnings allocated to participating securities (1,835) (2,655) (2,219) Less: undistributed earnings allocated to participating securities (64) — — Net income (loss) attributable to SL Green common stockholders (numerator for basic earnings per share) $ 5,161 $ (582,164) $ (95,243) Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares — — — Add back: undistributed earnings allocated to participating securities — — — Add back: effect of dilutive securities (redemption of units to common shares) — (37,465) (5,794) Income (loss) attributable to SL Green common stockholders (numerator for diluted earnings per share) $ 5,161 $ (619,629) $ (101,037) Year Ended December 31, Denominator 2024 2023 2022 Basic Shares: Weighted average common stock outstanding 65,062 63,809 63,917 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares — 4,163 4,012 Stock-based compensation plans 626 — — Diluted weighted average common stock outstanding 65,688 67,972 67,929

Partners' Capital of the Oper_2

Partners' Capital of the Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Schedule of calculation of numerator and denominator in earnings per unit	The Operating Partnership's earnings per unit for the years ended December 31, 2024, 2023, and 2022 respectively are computed as follows (in thousands): Year Ended December 31, Numerator 2024 2023 2022 Basic Earnings: Net Income (loss) attributable to SLGOP common unitholders (numerator for diluted earnings per unit) $ 7,557 $ (616,974) $ (98,818) Less: distributed earnings allocated to participating securities (4,665) (2,655) (2,219) Net income (loss) attributable to SLGOP common unitholders (numerator for basic earnings per unit) $ 2,892 $ (619,629) $ (101,037) Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 26 — — Income (loss) attributable to SLGOP common unitholders $ 2,918 $ (619,629) $ (101,037) Year Ended December 31, Denominator 2024 2023 2022 Basic units: Weighted average common units outstanding 68,736 67,972 67,929 Effect of Dilutive Securities: Stock-based compensation plans 757 — — Contingently issuable units 112 — — Diluted weighted average common units outstanding 69,605 67,972 67,929

Share-based Compensation (Table

Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted	The fair value of each stock option or LTIP Unit granted is estimated on the date of grant using the Black-Scholes option pricing model based on historical information with the following weighted average assumptions for grants during the year ended December 31, 2024 (there were no options granted during the years ended December 31, 2023 and 2022). 2024 2023 2022 Dividend yield 5.5 % N/A N/A Expected life 7.5 years N/A N/A Risk-free interest rate 4.45 % N/A N/A Expected stock price volatility 45.0 % N/A N/A
Summary of the status of stock options and changes during the period	A summary of the status of the Company's stock options as of December 31, 2024, 2023, and 2022 and changes during the years ended December 31, 2024, 2023, and 2022 are as follows: Year Ended December 31, 2024 2023 2022 Options Outstanding Weighted Average Options Outstanding Weighted Average Options Weighted Balance at beginning of year 115,980 $ 103.52 313,480 $ 97.59 394,089 $ 100.56 Granted 217,917 68.07 — — — — Lapsed or canceled — — (197,500) 84.14 (80,609) 112.14 Balance at end of year 333,897 $ 81.63 115,980 $ 103.52 313,480 $ 97.59 Options exercisable at end of year 115,980 $ 103.52 115,980 $ 103.52 313,480 $ 97.59
Schedule of other share-based compensation, activity	A summary of the Company's restricted stock as of December 31, 2024, 2023, and 2022 and changes during the years ended December 31, 2024, 2023, and 2022 are as follows: Year Ended December 31, 2024 2023 2022 Balance at beginning of year 4,089,174 3,758,174 3,459,363 Granted 371,285 337,350 314,995 Canceled (10,750) (6,350) (16,184) Balance at end of year 4,449,709 4,089,174 3,758,174 Vested during the year 143,453 147,915 118,255 Compensation expense recorded $ 10,939,602 $ 7,766,055 $ 10,133,905 Total fair value of restricted stock granted during the year $ 24,676,422 $ 15,789,540 $ 16,804,931

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Schedule of accumulated other comprehensive income	The following tables set forth the changes in accumulated other comprehensive income by component as of December 31, 2024, 2023 and 2022 (in thousands): Net unrealized gain (loss) on derivative instruments ( 1 ) SL Green's share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Net unrealized (loss) gain on marketable securities Total Balance at December 31, 2021 $ (25,881) $ (21,994) $ 1,117 $ (46,758) Other comprehensive income (loss) before reclassifications 78,300 23,405 (1,359) 100,346 Amounts reclassified from accumulated other comprehensive income (4,619) 635 — (3,984) Balance at December 31, 2022 47,800 2,046 (242) 49,604 Other comprehensive (loss) income before reclassifications 17,269 6,950 (1,549) 22,670 Amounts reclassified from accumulated other comprehensive income (39,717) (15,080) — (54,797) Balance at December 31, 2023 25,352 (6,084) (1,791) 17,477 Other comprehensive income before reclassifications 39,049 6,515 525 46,089 Amounts reclassified from accumulated other comprehensive income (35,071) (10,299) — (45,370) Balance at December 31, 2024 $ 29,330 $ (9,868) $ (1,266) $ 18,196 (1) Amount reclassified from accumulated other comprehensive income is included in interest expense in the respective consolidated statements of operations. As of December 31, 2024 and 2023, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive income relating to net unrealized gain (loss) on derivative instruments, was ($0.2 million) and ($0.4 million), respectively. (2) Amount reclassified from accumulated other comprehensive income is included in equity in net loss from unconsolidated joint ventures in the respective consolidated statements of operations.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair value measurements, recurring and nonrecurring	The following tables set forth the assets and liabilities that we measure at fair value on a recurring and non-recurring basis by their levels in the fair value hierarchy as of December 31, 2024 and 2023 (in thousands): December 31, 2024 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 17,323 $ — $ 17,323 $ — Interest rate cap and swap agreements (included in Other assets) $ 31,860 $ — $ 31,860 $ — Real estate loans held by consolidated securitization vehicles $ 584,134 $ 584,134 Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 6,469 $ — $ 6,469 $ — Senior obligations of consolidated securitization vehicles $ 567,487 $ 567,487 Secured borrowing (1) $ 251,096 $ 251,096 (1) The Company admitted an additional partner to the One Madison Avenue development project with the partner's indirect ownership in the joint venture totaling 25.0%. The transaction did not meet sale accounting under ASC 860 and, as a result, was treated as a secured borrowing for accounting purposes and is included in Other liabilities in our consolidated balance sheets. December 31, 2023 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 9,591 $ — $ 9,591 $ — Interest rate cap and swap agreements (included in Other assets) $ 33,456 $ — $ 33,456 $ — Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 17,108 $ — $ 17,108 $ —
Fair value, by balance sheet grouping	The following table provides the carrying value and fair value of these financial instruments as of December 31, 2024 and December 31, 2023 (in thousands): December 31, 2024 December 31, 2023 Carrying Value (1) Fair Value Carrying Value (1) Fair Value Debt and preferred equity investments $ 303,726 (2) $ 346,745 (2) Fixed rate debt $ 3,257,474 $ 3,225,767 $ 3,237,386 $ 3,184,338 Variable rate debt (3) 363,550 355,364 270,000 268,787 Total debt $ 3,621,024 $ 3,581,131 $ 3,507,386 $ 3,453,125 (1) Amounts exclude net deferred financing costs. (2) As of December 31, 2024, debt and preferred equity investments had an estimated fair value of approximately $0.3 billion. As of December 31, 2023, debt and preferred equity investments had an estimated fair value of approximately $0.3 billion.

Financial Instruments_ Deriva_2

Financial Instruments: Derivatives and Hedging (Tables)	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional and Fair Value of Derivative Financial Instruments and Foreign Currency Hedges	The following table summarizes the notional value at inception and fair value of our consolidated derivative financial instruments as of December 31, 2024 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands). Notional Strike Effective Expiration Balance Sheet Location Fair Interest Rate Cap 205,000 4.000 % February 2024 February 2025 Other Assets $ 75 Interest Rate Cap 370,000 3.250 % June 2024 June 2025 Other Assets 1,653 Interest Rate Cap 370,000 3.250 % June 2024 June 2025 Other Liabilities (1,649) Interest Rate Cap 68,678 4.000 % August 2024 July 2025 Other Liabilities (102) Interest Rate Swap 150,000 2.621 % December 2021 January 2026 Other Assets 2,196 Interest Rate Swap 200,000 2.662 % December 2021 January 2026 Other Assets 2,849 Interest Rate Swap 125,000 3.667 % August 2024 December 2026 Other Assets 828 Interest Rate Swap 125,000 3.670 % August 2024 December 2026 Other Assets 820 Interest Rate Swap 100,000 2.903 % February 2023 February 2027 Other Assets 2,225 Interest Rate Swap 100,000 2.733 % February 2023 February 2027 Other Assets 2,568 Interest Rate Swap 50,000 2.463 % February 2023 February 2027 Other Assets 1,557 Interest Rate Swap 200,000 2.591 % February 2023 February 2027 Other Assets 5,711 Interest Rate Swap 300,000 2.866 % July 2023 May 2027 Other Assets 7,637 Interest Rate Swap 150,000 3.524 % January 2024 May 2027 Other Assets 1,618 Interest Rate Swap 370,000 3.888 % November 2022 June 2027 Other Assets 970 Interest Rate Swap 68,678 4.466 % August 2024 June 2027 Other Liabilities (765) Interest Rate Swap 300,000 4.487 % November 2024 November 2027 Other Liabilities (3,953) Interest Rate Swap 100,000 3.756 % January 2023 January 2028 Other Assets 722 Interest Rate Swap 204,963 3.915 % February 2025 May 2028 Other Assets 431 $ 25,391 The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of December 31, 2024 based on Level 2 information. The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks (dollars in thousands). Notional Value Strike Rate Effective Date Expiration Date Classification Fair Value Interest Rate Cap $ 658,357 4.000 % November 2024 May 2025 Asset $ 727 Interest Rate Cap 285,000 4.000 % August 2024 July 2025 Asset 423 Interest Rate Swap 250,000 3.608 % April 2023 February 2026 Asset 1,309 Interest Rate Swap 250,000 3.608 % April 2023 February 2026 Asset 1,309 Interest Rate Swap 177,000 1.555 % December 2022 February 2026 Asset 4,964 Interest Rate Swap 268,750 4.039 % July 2024 September 2028 Liability (534) Interest Rate Swap 268,750 4.058 % July 2024 September 2028 Liability (711) Interest Rate Swap 537,500 4.065 % July 2024 September 2028 Liability (1,628) $ 5,859
Schedule of Effect of Derivative Financial Instruments on Consolidated Statements of Income	The following table presents the effects of our derivative financial instruments and our share of our joint ventures' derivative financial instruments that are designated and qualify as hedging instruments on the consolidated statements of operations for the years ended December 31, 2024, 2023, and 2022, respectively (in thousands): Amount of Gain (Loss) Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain (Loss) Reclassified from Year Ended December 31, Year Ended December 31, Derivative 2024 2023 2022 2024 2023 2022 Interest Rate Swaps/Caps $ 41,802 $ 18,484 $ 83,162 Interest expense $ 37,398 $ 42,270 $ 4,989 Share of unconsolidated joint ventures' derivative instruments 6,870 7,399 24,783 Equity in net loss from unconsolidated joint ventures 10,965 16,050 (673) $ 48,672 $ 25,883 $ 107,945 $ 48,363 $ 58,320 $ 4,316

Lease Income (Tables)

Lease Income (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Lessor, operating lease, payments to be received, maturity	Future minimum rents to be received over the next five years and thereafter for operating leases in effect at December 31, 2024 are as follows (in thousands): 2025 $ 544,452 2026 507,298 2027 454,095 2028 390,475 2029 355,565 Thereafter 1,402,994 $ 3,654,879
Operating lease, lease income	The components of lease income from operating leases in our consolidated statements of operations for the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Fixed lease payments $ 545,573 $ 589,469 $ 583,107 Variable lease payments 63,004 79,641 82,676 Total lease payments (1) $ 608,577 $ 669,110 $ 665,783 Amortization of acquired above and below-market leases (2,578) 14,225 5,717 Total rental revenue $ 605,999 $ 683,335 $ 671,500 (1) Amounts include $188.5 million and $196.5 million of sublease income for the years ended December 31, 2024 and 2023, respectively.
Schedule of sales type leases	The table below summarizes our investment in sales-type leases as of December 31, 2024: Property Year of Current Expiration Year of Final Expiration (1) 15 Beekman (2) 2089 2089 (1) Reflects exercise of all available renewal options. (2) In August 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company for the building at 15 Beekman. See Note 6, "Investments in Unconsolidated Joint Ventures."
Sales-type and direct financing leases, lease receivable, maturity	Future minimum lease payments to be received over the next five years and thereafter for our sales-type leases with initial terms in excess of one year as of December 31, 2024 are as follows (in thousands): Sales-type leases 2025 $ 3,228 2026 3,276 2027 3,325 2028 3,375 2029 3,426 Thereafter 193,367 Total minimum lease payments $ 209,997 Amount representing interest (103,044) Investment in sales-type leases (1) $ 106,953 (1) This amount is included in Other assets in our consolidated balance sheets.
Sales-type lease, lease income	The components of lease income from sales-type leases during the years ended December 31, 2024, 2023 and 2022 were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Interest income (1) $ 4,500 $ 4,444 $ 4,389 (1) These amounts are included in Interest expense, net of interest income in our consolidated statements of operations.

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Schedule of contributions made to multi-employer plans	Contributions we made to the multi-employer plans for the years ended December 31, 2024, 2023 and 2022 are included in the table below (in thousands): Year Ended December 31, Benefit Plan 2024 2023 2022 Pension Plan $ 2,157 $ 2,111 $ 1,952 Health Plan 6,256 7,191 6,386 Other plans 740 789 807 Total plan contributions $ 9,153 $ 10,091 $ 9,145

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of ground lease arrangements	The table below summarizes our current lease arrangements as of December 31, 2024: Property (1) Year of Current Expiration Year of Final Expiration (2) 711 Third Avenue (3) 2033 2083 1185 Avenue of the Americas 2043 2043 SL Green Headquarters at One Vanderbilt Avenue (4) 2043 2048 420 Lexington Avenue 2050 2080 SUMMIT One Vanderbilt 2058 2070 15 Beekman (5)(6) 2119 2119 (1) All leases are classified as operating leases unless otherwise specified. (2) Reflects exercise of all available extension options. (3) The Company owns 50% of the fee interest. (4) In March 2021, the Company commenced its lease for its corporate headquarters at One Vanderbilt Avenue. See note 10, "Related Party Transactions." (5) The Company has an option to purchase the ground lease for a fixed price on a specific date. The lease is classified as a financing lease. (6) In August 2020, the Company entered into a long-term sublease with an unconsolidated joint venture as part of the capitalization of the 15 Beekman development project. See Note 6, "Investments in Unconsolidated Joint Ventures."
Finance lease, liability, maturity	The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of December 31, 2024 (in thousands): Financing leases Operating leases 2025 $ 3,228 $ 53,595 2026 3,276 53,734 2027 3,325 53,746 2028 3,375 54,211 2029 3,426 54,443 Thereafter 193,368 1,154,422 Total minimum lease payments $ 209,998 $ 1,424,151 Amount representing interest (103,145) — Amount discounted using incremental borrowing rate — (613,162) Total lease liabilities $ 106,853 $ 810,989
Schedule of future minimum rental payments for operating leases	The following is a schedule of future minimum lease payments as evaluated in accordance with ASC 842 for our financing leases and operating leases with initial terms in excess of one year as of December 31, 2024 (in thousands): Financing leases Operating leases 2025 $ 3,228 $ 53,595 2026 3,276 53,734 2027 3,325 53,746 2028 3,375 54,211 2029 3,426 54,443 Thereafter 193,368 1,154,422 Total minimum lease payments $ 209,998 $ 1,424,151 Amount representing interest (103,145) — Amount discounted using incremental borrowing rate — (613,162) Total lease liabilities $ 106,853 $ 810,989
Lease, cost	The following table provides lease cost information for the Company's operating leases for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, Operating Lease Costs 2024 2023 2022 Operating lease costs before capitalized operating lease costs $ 24,423 $ 29,637 $ 33,773 Operating lease costs capitalized — (2,345) (6,830) Operating lease costs, net (1) $ 24,423 $ 27,292 $ 26,943 (1) This amount is included in Operating lease rent in our consolidated statements of operations. The following table provides lease cost information for the Company's financing leases for the years ended December 31, 2024, 2023 and 2022 (in thousands): Year Ended December 31, Financing Lease Costs 2024 2023 2022 Interest on financing leases before capitalized interest $ 4,502 $ 4,446 $ 4,555 Interest on financing leases, net (1) 4,502 4,446 4,555 Financing lease costs, net $ 4,502 $ 4,446 $ 4,555 (1) These amounts are included in Interest expense, net of interest income in our consolidated statements of operations. (2) These amounts are included in Depreciation and amortization in our consolidated statements of operations.

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of selected results of operations and selected asset information	The reportable segment profit or loss measures for the twelve months ended December 31, 2024, December 31, 2023, and December 31, 2022 are as follows (in thousands): December 31, 2024 Real Estate Segment SUMMIT Segment DPE Segment Total Total revenues $ 709,725 $ 133,214 $ 43,333 $ 886,272 Expenses: SUMMIT Operator expenses — 111,739 — SUMMIT Operator tax expense — 730 — Operating Expenses 189,598 — — Real Estate Taxes 128,187 — — Operating lease rent 24,423 — — Net operating income from unconsolidated joint ventures $ 363,113 Real Estate segment Net operating income $ 730,630 $ 730,630 Equity in net loss (income) from unconsolidated joint ventures — 11,513 Depreciation and amortization (2,436) — Interest expense, net of interest income — (28,142) Interest expense on senior obligations of consolidated securitization vehicles — (14,634) SUMMIT and DPE Net income $ 18,309 $ 12,070 $ 30,379 Non-operating net loss from unconsolidated joint ventures (291,131) Marketing, general and administrative expense (85,187) Transaction related costs (401) Gain on early extinguishment of debt 43,762 Depreciable real estate reserves (104,071) Depreciable real estate reserves in unconsolidated joint venture (263,190) Gain on sale of real estate, net 3,025 Purchase price and other fair value adjustments 88,966 Equity in net gain on sale of interest in unconsolidated joint venture/real estate 208,144 Depreciation and amortization (205,007) Amortization of deferred financing costs (6,619) Interest expense, net of interest income (119,078) Net Income $ 30,222 December 31, 2023 Real Estate Segment SUMMIT Segment DPE Segment Total Total revenues $ 760,745 $ 118,260 $ 34,705 $ 913,710 Expenses: SUMMIT Operator expenses — 101,211 — SUMMIT Operator tax expense — 9,201 — Operating Expenses 196,696 — — Real Estate Taxes 143,757 — — Operating lease rent 27,292 — — Net operating income from unconsolidated joint ventures 205,694 Real Estate segment Net operating income $ 598,694 $ 598,694 Loan loss and other investment reserves, net of recoveries — (6,890) Depreciation and amortization (1,747) — Interest expense, net of interest income — (34,149) SUMMIT and DPE Net income $ 6,101 $ (6,334) $ (233) Non-operating net loss from unconsolidated joint ventures (282,203) Marketing, general and administrative expense (111,389) Transaction related costs (1,099) Loss on early extinguishment of debt (870) Depreciable real estate reserves (382,374) Loss on sale of real estate, net (32,370) Purchase price and other fair value adjustments (17,260) Equity in net loss on sale of interest in unconsolidated joint venture/real estate (13,368) Depreciation and amortization (246,063) Amortization of deferred financing costs (7,837) Interest expense, net of interest income (102,965) Net Loss $ (599,337) December 31, 2022 Real Estate Segment SUMMIT Segment DPE Segment Total Total revenues $ 749,293 $ 89,048 $ 81,113 $ 919,454 Expenses: SUMMIT Operator expenses — 89,207 — SUMMIT Operator tax expense — 2,647 — Operating Expenses 174,063 — — Real Estate Taxes 26,943 — — Operating lease rent 138,228 — — Net operating income from unconsolidated joint ventures $ 195,508 Real Estate segment Net operating income $ 605,567 $ 605,567 Depreciation and amortization (862) — Interest expense, net of interest income — (25,133) SUMMIT and DPE Net income $ (3,668) $ 55,980 $ 52,312 Non-operating net loss from unconsolidated joint ventures (253,466) Marketing, general and administrative expense (93,798) Transaction related costs (409) Depreciable real estate reserves (6,313) Loss on sale of real estate, net (84,485) Purchase price and other fair value adjustments (8,118) Equity in net loss on sale of interest in unconsolidated joint venture/real estate (131) Depreciation and amortization (215,305) Amortization of deferred financing costs (7,817) Interest expense, net of interest income (64,340) Net Loss $ (76,303)

Organization and Basis of Pre_3

Organization and Basis of Presentation - Narrative (Details) ft² in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) ft² building shares	Dec. 31, 2023
Organization
Number of shares to be received on redemption of one unit of limited partnership interests (shares) | shares		1
Subsequent Event | Mortgage To Finance Acquisition
Organization
Debt instrument, face amount	$ 80
Initial Term (in Years)	5 years
Interest rate added to base rate (as a percent)	2.40%
Interest rate, fixed rate debt (as a percent)	6.57%
Park Avenue 500 | Subsequent Event
Organization
Gross Asset Valuation (in millions)	$ 130
Managed Office Properties
Organization
Approximate square feet | ft²		0.4
Debt and preferred equity investments including investments held by unconsolidated joint ventures		$ 303.7
Debt and preferred equity investments and other financing receivables included in other balance sheet items		$ 9.7
Office
Organization
Number of Buildings | building		1
Retail building
Organization
Number of Buildings | building		1
Service Corporation
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)		95%
SLG Management LLC | SL Green Management
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)		100%
Operating Partnership | SL Green Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)		5.97%	5.75%

Organization and Basis of Pre_4

Organization and Basis of Presentation - Schedule of Interests in Investment Properties (Details)	Dec. 31, 2024 ft² building
Manhattan
Real estate properties
Number of Buildings | building	30
Approximate Square Feet	24,072,287
Weighted Average Occupancy (as a percent)	92.50%
Commercial Property
Real estate properties
Number of Buildings | building	37
Approximate Square Feet	24,935,087
Weighted Average Occupancy (as a percent)	91.80%
Office | Manhattan
Real estate properties
Number of Buildings | building	24
Approximate Square Feet	21,762,590
Weighted Average Occupancy (as a percent)	92.50%
Office | Suburban
Real estate properties
Number of Buildings | building	7
Approximate Square Feet	862,800
Weighted Average Occupancy (as a percent)	73.50%
Retail | Manhattan
Real estate properties
Number of Buildings | building	3
Approximate Square Feet	43,442
Weighted Average Occupancy (as a percent)	100%
Development/Redevelopment | Manhattan
Real estate properties
Number of Buildings | building	3
Approximate Square Feet	2,266,255
Residential | Manhattan
Real estate properties
Number of Buildings | building	2
Approximate Square Feet	362,266
Weighted Average Occupancy (as a percent)	99.10%
Core Portfolio
Real estate properties
Number of Buildings | building	39
Approximate Square Feet	25,297,353
Core Portfolio | Manhattan
Real estate properties
Weighted Average Occupancy (as a percent)	91.90%
Alternative strategy portfolio | Manhattan
Real estate properties
Number of Buildings | building	7
Approximate Square Feet	2,567,025
Weighted Average Occupancy (as a percent)	63%
Consolidated | Manhattan
Real estate properties
Number of Buildings | building	19
Approximate Square Feet	10,498,708
Consolidated | Commercial Property
Real estate properties
Number of Buildings | building	26
Approximate Square Feet	11,361,508
Consolidated | Office | Manhattan
Real estate properties
Number of Buildings | building	15
Approximate Square Feet	9,587,441
Consolidated | Office | Suburban
Real estate properties
Number of Buildings | building	7
Approximate Square Feet	862,800
Consolidated | Retail | Manhattan
Real estate properties
Number of Buildings | building	2
Approximate Square Feet	30,496
Consolidated | Retail | Manhattan | 7 Dey/185 Broadway
Real estate properties
Approximate Square Feet	140,382
Consolidated | Development/Redevelopment | Manhattan
Real estate properties
Number of Buildings | building	2
Approximate Square Feet	880,771
Consolidated | Residential | Manhattan
Real estate properties
Number of Buildings | building	1
Approximate Square Feet	140,382
Consolidated | Residential | Manhattan | 7 Dey/185 Broadway
Real estate properties
Approximate Square Feet	50,206
Consolidated | Core Portfolio
Real estate properties
Number of Buildings | building	27
Approximate Square Feet	11,501,890
Consolidated | Alternative strategy portfolio | Manhattan
Real estate properties
Number of Buildings | building	0
Approximate Square Feet	0
Unconsolidated | Manhattan
Real estate properties
Number of Buildings | building	11
Approximate Square Feet	13,573,579
Unconsolidated | Commercial Property
Real estate properties
Number of Buildings | building	11
Approximate Square Feet	13,573,579
Unconsolidated | Office | Manhattan
Real estate properties
Number of Buildings | building	9
Approximate Square Feet	12,175,149
Unconsolidated | Office | Suburban
Real estate properties
Number of Buildings | building	0
Approximate Square Feet	0
Unconsolidated | Retail | Manhattan
Real estate properties
Number of Buildings | building	1
Approximate Square Feet	12,946
Unconsolidated | Development/Redevelopment | Manhattan
Real estate properties
Number of Buildings | building	1
Approximate Square Feet	1,385,484
Unconsolidated | Residential | Manhattan
Real estate properties
Number of Buildings | building	1
Approximate Square Feet	221,884
Unconsolidated | Core Portfolio
Real estate properties
Number of Buildings | building	12
Approximate Square Feet	13,795,463
Unconsolidated | Alternative strategy portfolio | Manhattan
Real estate properties
Number of Buildings | building	7
Approximate Square Feet	2,567,025

Significant Accounting Polici_4

Significant Accounting Policies - Investment in Commercial Real Estate Properties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Weighted average amortization period, above-market lease costs	10 years
Weighted average amortization period, below-market lease costs	12 years 1 month 6 days
Weighted average amortization period, in-place lease costs	8 years 10 months 24 days
Period from cessation of major construction activity to completion of construction project, maximum	1 year
Minimum | Above Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | Below Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | In Place Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | Building
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Maximum | Above Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | Below Market Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | In Place Leases
Property, Plant and Equipment [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | Building
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	40 years

Significant Accounting Polici_5

Significant Accounting Policies - Schedule of Estimated Useful Lives (Details)	Dec. 31, 2024
Building (fee ownership)
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Building (leasehold interest) | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Right of use assets - financing leases | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years
Furniture and fixtures | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	7 years
Furniture and fixtures | Minimum
Real Estate [Line Items]
Estimated useful life (in years)	4 years

Significant Accounting Polici_6

Significant Accounting Policies - Depreciation and Amortization of Right of Use Assets (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2024	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Franchisor Disclosure [Line Items]
Depreciation expense (including amortization of the capital lease asset)			$ 183,900	$ 221,000	$ 190,100
Mortgages and other loans payable, net			1,944,635	1,491,319
Repayments of mortgages			68,977	25,826	292,364
Amortization of above and below Market Leases			2,600	14,200	$ 5,700
Due from joint ventures
Franchisor Disclosure [Line Items]
Mortgages and other loans payable, net			12,234,261	$ 14,799,277
719 Seventh Avenue
Franchisor Disclosure [Line Items]
Write down of value in leasehold interest		$ 46,300
719 Seventh Avenue | Andrew Mathias | Related party
Franchisor Disclosure [Line Items]
Proceeds from sale of property	$ 30,500
760 Madison Avenue
Franchisor Disclosure [Line Items]
Write down of value in leasehold interest			17,600
Capitalized interest			15,100
690 Madison Avenue
Franchisor Disclosure [Line Items]
Write down of value in leasehold interest			$ 34,300
690 Madison Avenue | Due from joint ventures
Franchisor Disclosure [Line Items]
Reduction of ownership percentage			90%
Mortgages and other loans payable, net			$ 60,900
Repayments of mortgages			$ 32,100

Significant Accounting Polici_7

Significant Accounting Policies - Schedule of Identified Intangible Assets and Intangible Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Identified intangible assets (included in other assets):
Gross amount	$ 378,277	$ 189,680
Accumulated amortization	(197,211)	(184,902)
Net	181,066	4,778
Identified intangible liabilities (included in deferred revenue):
Gross amount	243,703	205,394
Accumulated amortization	(204,092)	(202,089)
Net	$ 39,611	$ 3,305

Significant Accounting Polici_8

Significant Accounting Policies - Schedule of Estimated Annual Amortization of Acquired Above-market Leases, Net of Acquired Below-market Leases (Details) - Acquired Above-market Leases, Net of Acquired Below-market Leases $ in Thousands	Dec. 31, 2024 USD ($)
Real Estate [Line Items]
2025	$ 5,828
2026	5,265
2027	4,754
2028	4,058
2029	$ 3,719

Significant Accounting Polici_9

Significant Accounting Policies - Schedule of Estimated Annual Amortization of all Other Identifiable Assets (Details) - Other Identifiable Assets $ in Thousands	Dec. 31, 2024 USD ($)
Real Estate [Line Items]
2025	$ 30,485
2026	26,943
2027	21,648
2028	16,492
2029	$ 15,008

Significant Accounting Polic_10

Significant Accounting Policies - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment in Marketable Securities
Commercial mortgage-backed securities - available-for-sale	$ 17,323	$ 9,591
Total investment in marketable securities	22,812	9,591
Commercial mortgage-backed securities - available-for-sale
Investment in Marketable Securities
Commercial mortgage-backed securities - available-for-sale	17,323	9,591
Debt securities, held-to-maturity, amortized cost, after allowance for credit loss	5,489	0
Total investment in marketable securities	$ 22,812	$ 9,591

Significant Accounting Polic_11

Significant Accounting Policies - Investment in Marketable Securities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) marketableSecurity
Real Estate [Line Items]
Allowance for loan loss	$ 0	$ 0	$ 0
Proceeds from sale of marketable securities	0	0	$ 7,800,000
Number of marketable securities sold | security			1
Proceeds from the repayment of debt marketable securities			$ 3,700,000
Number of securities repaid | security			1
Equity marketable securities	0	0
Number of securities sold | marketableSecurity				1
Proceeds from sale of equity marketable securities				$ 4,200,000
Marketable securities, realized loss			$ 6,500,000
Commercial mortgage-backed securities - available-for-sale
Real Estate [Line Items]
Cost basis of commercial mortgage backed securities	$ 18,300,000	11,500,000
Number of securities in unrealized gain position | security	1
Unrealized gain	$ 200,000
Fair market value	$ 5,500,000
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, number of positions | security	2
Unrealized loss	$ 1,500,000	1,900,000
Fair value of security in a continuous unrealized loss position for less than 12 months	$ 11,800,000	9,600,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, number of positions | security	1
Debt securities, held-to-maturity, amortized cost, after allowance for credit loss	$ 5,489,000	$ 0
Debt securities, held-to-maturity, amortized cost, discount	$ 200,000

Significant Accounting Polic_12

Significant Accounting Policies - Investment in CMBS Securitization Trusts (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value [Abstract]
Real estate loans held by consolidated securitization vehicles	$ 584,134
Senior obligations of consolidated securitization vehicles	567,487
Principal Value
Servicing asset at amortized cost	134,800
Servicing liability at amortized cost, balance	34,200
Real estate loans held by consolidated securitization vehicles
Fair Value [Abstract]
Real estate loans held by consolidated securitization vehicles	709,095	$ 0
Principal Value
Real estate loans held by consolidated securitization vehicles	894,000	0
Senior obligations of consolidated securitization vehicles
Fair Value [Abstract]
Senior obligations of consolidated securitization vehicles	590,131	0
Principal Value
Senior obligations of consolidated securitization vehicles	688,346	0
Securitization Vehicles, Real Estate Loans In Excess Of Senior Obligations
Fair Value [Abstract]
Real estate loans held by consolidated securitization vehicles in excess of senior obligations of consolidated securitization vehicles	118,964	0
Principal Value
Real estate loans held by consolidated securitization vehicles in excess of senior obligations of consolidated securitization vehicles	$ 205,654	$ 0

Significant Accounting Polic_13

Significant Accounting Policies - Deferred Lease Costs (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Portion of compensation capitalized	$ 8.5	$ 6.8	$ 6.6
Estimated average lease term (in years)	7 years

Significant Accounting Polic_14

Significant Accounting Policies - Revenue Recognition (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Deferred Revenue Arrangement By Type Table [Line Items]
Days past due for income recognition on debt and preferred equity investments to be suspended	90 days
Deferred revenue	$ 164,887	$ 134,053
Unused and Unexpired Tickets
Deferred Revenue Arrangement By Type Table [Line Items]
Deferred revenue	$ 3,100	$ 2,600

Significant Accounting Polic_15

Significant Accounting Policies - Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Dividends Payable [Line Items]
SUMMIT Operator tax expense	$ 730	$ 9,201	$ 2,647
Federal, state and local tax provision	$ 700	$ 9,200	$ 2,600
Dividends per share paid (in dollars per share)	$ 3.16	$ 3.25	$ 6.17
Internal Revenue Service (IRS)
Dividends Payable [Line Items]
SUMMIT Operator tax expense	$ 4,900	$ 8,200	$ 3,700
O 2024 A Dividends
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)	$ 0.23
O 2023 A Dividends
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)		$ 0
O 2022 A Dividends
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)			$ 2.56
Capital Gains 2024 Dividend
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)	$ 2.93
Capital Gains 2023 Dividend
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)		$ 3.25
Capital Gains 2022 Dividend
Dividends Payable [Line Items]
Dividends per share paid (in dollars per share)			$ 1.17

Significant Accounting Polic_16

Significant Accounting Policies - Concentrations of Credit Risk (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024 tenant agreement
Annualized Rent | Customer Concentration
Concentration of Credit Risk
Number of tenants (tenants) | tenant	1
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)	5%
Annualized Rent | Customer Concentration | Tenant 1
Concentration of Credit Risk
Percentage of concentration (percent)	5.50%
Collective Bargaining Arrangements | Workforce Concentration
Concentration of Credit Risk
Percentage of concentration (percent)	57.20%
Number of collective bargaining agreements | agreement	5
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Workforce Concentration
Concentration of Credit Risk
Percentage of concentration (percent)	0%

Significant Accounting Polic_17

Significant Accounting Policies - Schedule of Properties Contributed of Annualized Cash Rent (Details) - Annualized Rent - Customer Concentration	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
One Vanderbilt Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	14.70%	16%	14.10%
11 Madison Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	8.80%	8.30%	7.80%
420 Lexington Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	7%	6.70%	6.30%
1515 Broadway
Concentration of Credit Risk
Percentage of concentration (percent)	6.70%	6.40%	5.80%
245 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	6.70%	5.50%	10%
1185 Avenue of the Americas
Concentration of Credit Risk
Percentage of concentration (percent)	5.90%	5.60%	5.10%
280 Park Avenue
Concentration of Credit Risk
Percentage of concentration (percent)	5.20%	5.50%	5.10%

Property Acquisitions and Con_3

Property Acquisitions and Consolidations - Schedule of Properties Acquired in 2024 (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2024 USD ($) ft²	Mar. 31, 2024 USD ($) ft²	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Investments in unconsolidated joint ventures	$ 2,690,138			$ 2,983,313
Investment fair value adjustment			$ 17,000	$ 17,000
10 East 53rd Street
Business Acquisition [Line Items]
Ownership Interest		45%
Investments in unconsolidated joint ventures		$ 7,200
Investment fair value adjustment	$ 117,800	$ 55,700
100 Park Avenue
Business Acquisition [Line Items]
Approximate Square Feet | ft²	834,000
Gross Asset Valuation (in millions)	$ 441,000
10 East 53rd Street
Business Acquisition [Line Items]
Approximate Square Feet | ft²		354,300
Gross Asset Valuation (in millions)		$ 236,000

Property Acquisitions and Con_4

Property Acquisitions and Consolidations - Schedule of Properties Acquired in 2022 (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 property	Dec. 31, 2023 property	Dec. 31, 2022 USD ($) ft²
Business Acquisition [Line Items]
Number of real estate properties acquired from third party | property	0	0
245 Park Avenue
Business Acquisition [Line Items]
Approximate Square Feet | ft²			1,782,793
Gross Asset Valuation (in millions) | $			$ 1,960

Properties Held for Sale and _3

Properties Held for Sale and Property Dispositions - Schedule of Properties Sold (Details)

1 Months Ended

12 Months Ended

Dec. 31, 2024 USD ($) ft²

Jul. 31, 2024 USD ($) ft²

Jun. 30, 2024 USD ($) ft²

Jun. 30, 2023 USD ($) ft²

Dec. 31, 2022 USD ($) ft²

Jun. 30, 2022 USD ($) ft²

May 31, 2022 USD ($) ft²

Apr. 30, 2022 USD ($) ft²

Feb. 28, 2022 USD ($) ft²

Dec. 31, 2024 USD ($) ft²

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($) ft²

Property Dispositions and Assets Held for Sale

Employee-related liabilities

$ 16,800,000

$ 0

$ 16,800,000

$ 2,000,000

$ 0

Discontinued Operation, Gain (Loss) On Disposal, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag

investment dispositions

investment dispositions

investment dispositions

Ownership percentage deconsolidated

50.10%

Investment fair value adjustment

$ 17,000,000

$ 17,000,000

885 Third Avenue

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

218,796

218,796

Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units) (3)

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

13,590

13,590

Sales price

$ 63,500,000

$ 63,500,000

(Loss) Gain on Sale

(1,500,000)

Palisades Premier Conference Center

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

450,000

Sales price

$ 26,300,000

(Loss) Gain on Sale

$ 7,300,000

719 Seventh Avenue

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

10,040

Sales price

$ 30,500,000

(Loss) Gain on Sale

$ (2,000,000)

245 Park Avenue

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

1,782,793

Sales price

$ 1,995,000,000

(Loss) Gain on Sale

$ (28,300,000)

Ownership interest disposed

49.90%

885 Third Avenue

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

414,317

414,317

Sales price

$ 300,400,000

$ 300,400,000

(Loss) Gain on Sale

(24,000,000)

609 Fifth Avenue

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

138,563

Sales price

$ 100,500,000

(Loss) Gain on Sale

$ (80,200,000)

1591-1597 Broadway

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

7,684

Sales price

$ 121,000,000

(Loss) Gain on Sale

$ (4,500,000)

1080 Amsterdam Avenue

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

85,250

Sales price

$ 42,700,000

(Loss) Gain on Sale

$ 17,900,000

707 Eleventh Avenue

Property Dispositions and Assets Held for Sale

Unaudited Approximate Usable Square Feet | ft²

159,720

Sales price

$ 95,000,000

(Loss) Gain on Sale

$ (800,000)

Properties Sold in 2023, 2022, and 2021

Property Dispositions and Assets Held for Sale

Employee-related liabilities

$ 5,100,000

$ 11,200,000

$ 5,100,000

$ 11,300,000

$ 11,200,000

Debt and Preferred Equity Inv_3

Debt and Preferred Equity Investments - Schedule of Activity in Debt and Preferred Equity Investments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) investment	Dec. 31, 2023 USD ($) investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 346,745	$ 623,280
Redemptions/sales/syndications/equity ownership/amortization	(64,629)	(349,947)
Net change in loan loss reserves	0	(6,890)
Balance at end of period	303,726	346,745
Carrying Value	$ 303,726	$ 346,745
Number of investments, nonperforming | investment	2	2
Total floating rate
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Carrying Value	$ 117,160	$ 168,899
Total floating rate | Alternative strategy portfolio
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Carrying Value	53,500
Debt Investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/fundings/accretion	12,890	72,160
Preferred Equity Investments
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/fundings/accretion	$ 8,720	$ 8,142

Debt and Preferred Equity Inv_4

Debt and Preferred Equity Investments - Schedule of Debt and Preferred Equity Investments (Details) $ in Thousands	Dec. 31, 2024 USD ($) investment	Dec. 31, 2023 USD ($) investment
Debt Instrument [Line Items]
Carrying Value	$ 303,726	$ 346,745
Senior Financing	$ 1,062,021
Number of investments, nonperforming | investment	2	2
Total floating rate
Debt Instrument [Line Items]
Carrying Value	$ 117,160	$ 168,899
Total floating rate | Alternative strategy portfolio
Debt Instrument [Line Items]
Carrying Value	53,500
Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	167,006
Senior Financing	812,021
Preferred Equity
Debt Instrument [Line Items]
Carrying Value	136,720
Senior Financing	250,000
Total floating rate
Debt Instrument [Line Items]
Carrying Value	117,006
Face Value	117,160
Total floating rate | Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	117,006
Face Value	117,160
Total floating rate | Preferred Equity
Debt Instrument [Line Items]
Carrying Value	0
Face Value	$ 0
Basis spread on variable rate	0%
Total floating rate | Minimum | Mezzanine Debt
Debt Instrument [Line Items]
Basis spread on variable rate	5.06%
Total floating rate | Maximum | Mezzanine Debt
Debt Instrument [Line Items]
Basis spread on variable rate	11.75%
Fixed Rate
Debt Instrument [Line Items]
Carrying Value	$ 186,720
Face Value	186,720
Fixed Rate | Mezzanine Debt
Debt Instrument [Line Items]
Carrying Value	50,000
Face Value	50,000
Fixed Rate | Preferred Equity
Debt Instrument [Line Items]
Carrying Value	136,720
Face Value	$ 136,720
Interest Rate	6.50%
Fixed Rate | Minimum | Mezzanine Debt
Debt Instrument [Line Items]
Interest Rate	8%
Fixed Rate | Maximum | Mezzanine Debt
Debt Instrument [Line Items]
Interest Rate	8.40%

Debt and Preferred Equity Inv_5

Debt and Preferred Equity Investments - Schedule of Roll Forward of our Total Allowance for Loan Losses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loan loss reserve activity
Balance at beginning of year	$ 13,520	$ 6,630	$ 6,630
Current period provision for loan loss	0	6,890	0
Balance at end of period	$ 13,520	$ 13,520	$ 6,630
Number of financing receivables on non-accrual without allowance for loan loss | loan	1
Alternative strategy portfolio | Total floating rate
Loan loss reserve activity
Financing receivable on non-accrual without allowance	$ 53,500

Debt and Preferred Equity Inv_6

Debt and Preferred Equity Investments - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) segment investment	Dec. 31, 2023 USD ($) investment segment	Dec. 31, 2022 USD ($)
Preferred equity investment
Number of investments, fully reserved | investment	1
Number of investments, nonperforming | investment	2	2
Debt and preferred equity investments	$ 303,726,000	$ 346,745,000
Recorded investment, past due	$ 303,726,000	$ 346,745,000
Number of portfolio segments of financial receivables (segment) | segment	1	1
Total after allowance for loan loss	$ 23,700,000	$ 8,800,000
Current period provision for loan loss	0	6,890,000	$ 0
2 - Watch List Assets - Higher potential for loss (1)
Preferred equity investment
Recorded investment, past due	147,006,000	136,412,000
Current period provision for loan loss	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0	0
Floating Rate
Preferred equity investment
Debt and preferred equity investments	117,160,000	168,899,000
Mortgage Investment One | Floating Rate
Preferred equity investment
Debt and preferred equity investments		49,800,000
Preferred Equity Investments
Preferred equity investment
Total after allowance for loan loss	$ 136,720,000	$ 128,000,000

Debt and Preferred Equity Inv_7

Debt and Preferred Equity Investments - Schedule of Carrying Value of Debt and Preferred Equity Investment Portfolio by Year of Origination and Risk Rating (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) investment	Dec. 31, 2024 USD ($) investment
Financing Receivable, Credit Quality Indicator [Line Items]
2023		$ 0
2022		0
2021		0
Prior		303,726
Total	$ 346,745	$ 303,726
Number of investments, nonperforming | investment	2	2
Carrying Value	$ 346,745	$ 303,726
Total floating rate
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	168,899	117,160
1 - Low Risk Assets - Low probability of loss
Financing Receivable, Credit Quality Indicator [Line Items]
2023		0
2022		0
2021		0
Prior		156,720
Total	210,333	156,720
2 - Watch List Assets - Higher potential for loss (1)
Financing Receivable, Credit Quality Indicator [Line Items]
2023		0
2022		0
2021		0
Prior		147,006
Total	136,412	147,006
Provision for loan loss recognized	6,900
3 - High Risk Assets - Loss more likely than not
Financing Receivable, Credit Quality Indicator [Line Items]
2023		0
2022		0
2021		0
Prior		0
Total	$ 0	$ 0

Debt and Preferred Equity Inv_8

Debt and Preferred Equity Investments - Schedule of Debt Investments with an Aggregate Weighted Average Current Yield (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate, interest rate	6.02%
Debt Investments Held [Abstract]
Carrying value at fixed rate	$ 303,726	$ 346,745
Carrying Value	303,726	346,745
Allowance for loan loss	(13,520)	(13,520)	$ (6,630)	$ (6,630)
Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Amount participated out	12,000
Debt Investment
Debt Investments Held [Abstract]
Future funding obligations	4,603
Senior financing	812,021
Carrying Value	167,006	218,745
Allowance for loan loss	(13,520)	(13,520)
Total fixed rate
Debt Investments Held [Abstract]
Future funding obligations	0
Senior financing	285,000
Carrying value at fixed rate	63,366	63,366
Total fixed rate | Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Future funding obligations	0
Senior financing	105,000
Carrying value at fixed rate	13,366	13,366
Total fixed rate | Mezzanine Loan Due January 2025
Debt Investments Held [Abstract]
Future funding obligations	0
Senior financing	95,000
Carrying value at fixed rate	30,000	30,000
Total fixed rate | Mezzanine Loan Due December 2029
Debt Investments Held [Abstract]
Future funding obligations	0
Senior financing	85,000
Carrying value at fixed rate	20,000	20,000
Total floating rate
Debt Investments Held [Abstract]
Future funding obligations	4,603
Senior financing	527,021
Carrying Value	117,160	168,899
Total floating rate | Mezzanine Loan Due July 2025
Debt Investments Held [Abstract]
Future funding obligations	0
Senior financing	54,000
Carrying Value	8,991	8,243
Total floating rate | Mezzanine Loan Due December 2025
Debt Investments Held [Abstract]
Future funding obligations	0
Senior financing	283,000
Carrying Value	53,687	50,000
Total floating rate | Mezzanine Loan Due January 2026
Debt Investments Held [Abstract]
Future funding obligations	4,603
Senior financing	190,021
Carrying Value	54,482	48,323
Total floating rate | Mezzanine Loan Due May 2024
Debt Investments Held [Abstract]
Future funding obligations	0
Senior financing	0
Carrying Value	$ 0	$ 62,333

Debt and Preferred Equity Inv_9

Debt and Preferred Equity Investments - Schedule of Preferred Equity Investments with an Aggregate Weighted Average Current Yield (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Preferred equity investment
Mortgage loans on real estate, interest rate	6.02%
Carrying Value	$ 303,726	$ 346,745
Allowance for loan loss	(13,520)	(13,520)	$ (6,630)	$ (6,630)
Total after allowance for loan loss	$ 23,700	8,800
Preferred Equity Investments
Preferred equity investment
Mortgage loans on real estate, interest rate	6.55%
Future funding obligations	$ 0
Senior financing	250,000
Total after allowance for loan loss	136,720	128,000
Preferred Equity, February 2027
Preferred equity investment
Future funding obligations	0
Senior financing	250,000
Carrying Value	$ 136,720	$ 128,000
Preferred Equity
Preferred equity investment
Aggregate weighted average current yield	6.55%
Carrying Value	$ 136,720

Investments in Unconsolidated_3

Investments in Unconsolidated Joint Ventures - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 2,690,138	$ 2,983,313
Net equity investment in VIEs in which the entity is not primary beneficiary	263,800	437,900
Revenues	886,272	913,710	$ 919,454
Due from joint ventures
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	2,690,138
Equity method investments with negative book value	150,500
Revenues	1,484,459	1,525,044	1,339,364
Due from joint ventures | Management Service, Base
Schedule of Equity Method Investments [Line Items]
Revenues	$ 21,900	$ 21,100	$ 24,000

Investments in Unconsolidated_4

Investments in Unconsolidated Joint Ventures - Schedule of General Information on Joint Ventures (Details)	1 Months Ended				3 Months Ended	12 Months Ended
	Nov. 30, 2024 USD ($)	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($) ft²	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) ft²	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2023	Dec. 31, 2021 USD ($)
General information on each joint venture
Depreciable real estate reserves and impairments						$ (104,071,000)	$ (382,374,000)	$ (6,313,000)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate						208,144,000	(13,368,000)	(131,000)
Mortgages and other loans payable, net			$ 1,491,319,000			1,944,635,000	1,491,319,000
Repayments of mortgages						68,977,000	25,826,000	292,364,000
Ownership percentage deconsolidated				50.10%
Investment fair value adjustment				$ 17,000,000			17,000,000
Carrying value of investment in leasehold interest			6,102,864,000			6,607,741,000	6,102,864,000	$ 9,198,799,000		$ 7,650,907,000
Carrying Value			346,745,000			303,726,000	346,745,000
Preferred Equity
General information on each joint venture
Carrying Value						136,720,000
245 Park Avenue
General information on each joint venture
Approximate Square Feet | ft²				1,782,793
Ownership interest disposed				49.90%
1552-1560 Broadway
General information on each joint venture
Depreciable real estate reserves and impairments			8,100,000
2 Herald Square
General information on each joint venture
Depreciable real estate reserves and impairments			101,700,000
625 Madison Avenue
General information on each joint venture
Depreciable real estate reserves and impairments					$ 5,900,000		23,100,000
625 Madison Avenue | Preferred Equity
General information on each joint venture
Carrying value of investment in leasehold interest						235,400,000
Carrying Value						$ 214,700,000
Average yield (as a percent)						8.86%
Due from joint ventures
General information on each joint venture
Mortgages and other loans payable, net			$ 14,799,277,000			$ 12,234,261,000	$ 14,799,277,000
Due from joint ventures | 2 Herald Square
General information on each joint venture
Consideration transferred		$ 0
Investment in joint venture, ownership percentage		95%
Mortgages and other loans payable, net		$ 182,500,000
Repayments of mortgages		$ 7,000,000
Private Investors | 115 Spring Street
General information on each joint venture
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate						$ 11,700,000
Private Investors | Due from joint ventures | 800 Third Avenue
General information on each joint venture
Economic Interest (as a percent)						60.52%
Approximate Square Feet | ft²						526,000
Private Investors | Due from joint ventures | 115 Spring Street
General information on each joint venture
Economic Interest (as a percent)						51%
Approximate Square Feet | ft²						5,218
Private Investors | Due from joint ventures | 625 Madison Avenue
General information on each joint venture
Economic Interest (as a percent)						90.93%
Approximate Square Feet | ft²						563,000
Ownership Interest									90.43%
New York State Teacher's Retirement System | Due from joint ventures | 919 Third Avenue
General information on each joint venture
Economic Interest (as a percent)						51%
Approximate Square Feet | ft²						1,454,000
Private Investor / Wharton Properties | Due from joint ventures | 11 West 34th Street
General information on each joint venture
Economic Interest (as a percent)						30%
Approximate Square Feet | ft²						17,150
Vornado Realty Trust | Due from joint ventures | 280 Park Avenue
General information on each joint venture
Economic Interest (as a percent)						50%
Approximate Square Feet | ft²						1,219,158
Wharton Properties | Due from joint ventures | 1552-1560 Broadway
General information on each joint venture
Economic Interest (as a percent)						50%
Approximate Square Feet | ft²						57,718
Wharton Properties | Due from joint ventures | 650 Fifth Avenue
General information on each joint venture
Economic Interest (as a percent)						50%
Approximate Square Feet | ft²						69,214
PGIM Real Estate | Due from joint ventures | 11 Madison Avenue
General information on each joint venture
Economic Interest (as a percent)						60%
Approximate Square Feet | ft²						2,314,000
National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd | One Vanderbilt Avenue
General information on each joint venture
Investment in joint venture aggregate maximum ownership percentage										11%
Investment In Joint Venture, Retained Ownership Percentage	60.01%
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	$ 72,600,000
National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd | Due from joint ventures | One Vanderbilt Avenue
General information on each joint venture
Economic Interest (as a percent)						60.01%
Approximate Square Feet | ft²						1,657,198
RXR Realty / New York REIT | Due from joint ventures | Worldwide Plaza
General information on each joint venture
Economic Interest (as a percent)						24.95%
Approximate Square Feet | ft²						2,048,725
Allianz Real Estate of America | Due from joint ventures | 1515 Broadway
General information on each joint venture
Economic Interest (as a percent)						56.87%
Approximate Square Feet | ft²						1,750,000
Israeli Institutional Investor | 2 Herald Square
General information on each joint venture
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	$ 20,400,000
Israeli Institutional Investor | Due from joint ventures | 2 Herald Square
General information on each joint venture
Economic Interest (as a percent)						95%
Approximate Square Feet | ft²						369,000
A fund managed by Meritz Alternative Investment Management | Due from joint ventures | 15 Beekman
General information on each joint venture
Economic Interest (as a percent)						20%
Approximate Square Feet | ft²						221,884
A fund managed by Meritz Alternative Investment Management | Due from joint ventures | 220 East 42nd Street
General information on each joint venture
Economic Interest (as a percent)						51%
Approximate Square Feet | ft²						1,135,000
Wells Fargo | 85 Fifth Avenue
General information on each joint venture
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate						$ 12,000,000
Wells Fargo | Due from joint ventures | 85 Fifth Avenue
General information on each joint venture
Economic Interest (as a percent)						36.27%
Approximate Square Feet | ft²						12,946
National Pension Service of Korea / Hines Interest LP / International Investor | One Madison Avenue
General information on each joint venture
Investment in joint venture aggregate maximum ownership percentage						25%				25%
National Pension Service of Korea / Hines Interest LP / International Investor | Due from joint ventures | One Madison Avenue
General information on each joint venture
Economic Interest (as a percent)						25.50%
Approximate Square Feet | ft²						1,048,700
Korean Institutional Investor / Israeli Institutional Investor | 450 Park Avenue | Third-Party
General information on each joint venture
Investment in joint venture, partners' ownership percentage						25%
Ownership Interest						49.90%
Korean Institutional Investor / Israeli Institutional Investor | Due from joint ventures | 450 Park Avenue
General information on each joint venture
Economic Interest (as a percent)						25.10%
Approximate Square Feet | ft²						337,000
Investment in joint venture, ownership percentage						25.10%
Ownership Interest						50.10%
U.S. Affiliate of Mori Trust Co., Ltd | Due from joint ventures | 245 Park Avenue
General information on each joint venture
Economic Interest (as a percent)						50.10%
Approximate Square Feet | ft²						1,782,793

Investments in Unconsolidated_5

Investments in Unconsolidated Joint Ventures - Schedule of Investments in Unconsolidated Joint Ventures Sold (Details) - USD ($)	1 Months Ended						3 Months Ended	12 Months Ended
	Nov. 30, 2024	May 31, 2024	Jan. 31, 2024	Dec. 31, 2023	Feb. 28, 2023	Apr. 30, 2022	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2024	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale								$ 208,144,000	$ (13,368,000)	$ (131,000)
Employee-related liabilities				$ 2,000,000				16,800,000	2,000,000	0
Carrying value of investment in leasehold interest				6,102,864,000				6,607,741,000	6,102,864,000	9,198,799,000		$ 7,650,907,000
Carrying Value				$ 346,745,000				303,726,000	346,745,000
Depreciable real estate reserves and impairments								(104,071,000)	(382,374,000)	$ (6,313,000)
625 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Depreciable real estate reserves and impairments							$ 5,900,000		$ 23,100,000
Preferred Equity
Schedule of Equity Method Investments [Line Items]
Carrying Value								136,720,000
Preferred Equity | 625 Madison Avenue
Schedule of Equity Method Investments [Line Items]
Carrying value of investment in leasehold interest								235,400,000
Carrying Value								$ 214,700,000
Average yield (as a percent)								8.86%
Due from joint ventures | One Vanderbilt Avenue | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold	11%
Gross Asset Valuation	$ 4,700,000,000
Gain (Loss) on Sale	$ 187,600,000
Due from joint ventures | 625 Madison Avenue | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold		90.43%
Gross Asset Valuation		$ 634,600,000
Gain (Loss) on Sale		$ (7,600,000)
Due from joint ventures | 717 Fifth Avenue | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold											10.92%
Gross Asset Valuation											$ 963,000,000
Gain (Loss) on Sale			$ 26,900,000
Due from joint ventures | 21 East 66th Street | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold				32.28%					32.28%
Gross Asset Valuation				$ 40,600,000					$ 40,600,000
Gain (Loss) on Sale				$ (12,700,000)
Due from joint ventures | 121 Greene Street | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold					50%
Gross Asset Valuation					$ 14,000,000
Gain (Loss) on Sale					$ (300,000)
Due from joint ventures | Stonehenge Portfolio | Wharton Properties
Schedule of Equity Method Investments [Line Items]
Gross Asset Valuation						$ 1,000,000
Gain (Loss) on Sale						$ 0

Investments in Unconsolidated_6

Investments in Unconsolidated Joint Ventures - Schedule of Mortgage Notes and Other Loans Payable Collateralized by the Respective Joint Venture Properties and Assignment of Leases (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total fixed rate debt		$ 1,587,474	$ 1,587,474	$ 1,387,386
Total floating rate debt		363,550	363,550	110,000
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate			208,144	(13,368)	$ (131)
115 Spring Street | Private Investors
Debt Instrument [Line Items]
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate			11,700
5 Times Square
Debt Instrument [Line Items]
Impairment charge		146,400
2 Herald Square | Israeli Institutional Investor
Debt Instrument [Line Items]
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	$ 20,400
100 Park Avenue
Debt Instrument [Line Items]
Total floating rate debt		360,000	360,000	0
Due from joint ventures
Debt Instrument [Line Items]
Total fixed rate debt		11,551,101	11,551,101	12,000,559
Total floating rate debt		780,889	780,889	2,902,780
Total joint venture mortgages and other loans payable		12,331,990	12,331,990	14,903,339
Deferred financing costs, net		(97,729)	(97,729)	(104,062)
Total joint venture mortgages and other loans payable, net		12,234,261	12,234,261	14,799,277
Due from joint ventures | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		5,728,933	5,728,933	6,053,808
Total floating rate debt		298,929	298,929	1,298,467
Total joint venture mortgages and other loans payable		6,027,862	6,027,862	7,352,275
Deferred financing costs, net		(49,058)	(49,058)	(54,865)
Total joint venture mortgages and other loans payable, net		$ 5,978,804	$ 5,978,804	7,297,410
Due from joint ventures | 650 Fifth Avenue | Wharton Properties
Debt Instrument [Line Items]
Economic Interest (as a percent)		50%	50%
Interest rate, floating rate debt (as a percent)		2.25%	2.25%
Total floating rate debt		$ 210,000	$ 210,000	210,000
Due from joint ventures | 650 Fifth Avenue | Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 105,000	$ 105,000	105,000
Due from joint ventures | 115 Spring Street | Private Investors
Debt Instrument [Line Items]
Economic Interest (as a percent)		51%	51%
Interest rate, fixed rate debt (as a percent)		5.50%	5.50%
Total fixed rate debt		$ 65,550	$ 65,550	65,550
Due from joint ventures | 115 Spring Street | Private Investors | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 33,431	$ 33,431	33,431
Due from joint ventures | 450 Park Avenue | Korean Institutional Investor / Israeli Institutional Investor
Debt Instrument [Line Items]
Economic Interest (as a percent)		25.10%	25.10%
Interest rate, fixed rate debt (as a percent)		6.10%	6.10%
Total fixed rate debt		$ 284,835	$ 284,835	271,394
Due from joint ventures | 450 Park Avenue | Korean Institutional Investor / Israeli Institutional Investor | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 71,494	$ 71,494	68,120
Due from joint ventures | 11 Madison Avenue | PGIM Real Estate
Debt Instrument [Line Items]
Economic Interest (as a percent)		60%	60%
Interest rate, fixed rate debt (as a percent)		3.84%	3.84%
Total fixed rate debt		$ 1,400,000	$ 1,400,000	1,400,000
Due from joint ventures | 11 Madison Avenue | PGIM Real Estate | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 840,000	$ 840,000	840,000
Due from joint ventures | 15 Beekman | A fund managed by Meritz Alternative Investment Management
Debt Instrument [Line Items]
Economic Interest (as a percent)		20%	20%
Interest rate, fixed rate debt (as a percent)		5.99%	5.99%
Total fixed rate debt		$ 120,000	$ 120,000	0
Total floating rate debt		0	0	124,137
Due from joint ventures | 15 Beekman | A fund managed by Meritz Alternative Investment Management | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		24,000	24,000	0
Total floating rate debt		$ 0	$ 0	24,827
Due from joint ventures | 800 Third Avenue | Private Investors
Debt Instrument [Line Items]
Economic Interest (as a percent)		60.52%	60.52%
Interest rate, fixed rate debt (as a percent)		3.37%	3.37%
Total fixed rate debt		$ 177,000	$ 177,000	177,000
Due from joint ventures | 800 Third Avenue | Private Investors | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 107,120	$ 107,120	107,120
Due from joint ventures | 1515 Broadway | Allianz Real Estate of America
Debt Instrument [Line Items]
Economic Interest (as a percent)		56.87%	56.87%
Due from joint ventures | 919 Third Avenue | New York State Teacher's Retirement System
Debt Instrument [Line Items]
Economic Interest (as a percent)		51%	51%
Interest rate, fixed rate debt (as a percent)		6.11%	6.11%
Total fixed rate debt		$ 500,000	$ 500,000	500,000
Due from joint ventures | 919 Third Avenue | New York State Teacher's Retirement System | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 255,000	$ 255,000	255,000
Due from joint ventures | 280 Park Avenue | Vornado Realty Trust
Debt Instrument [Line Items]
Economic Interest (as a percent)		50%	50%
Interest rate, fixed rate debt (as a percent)		5.84%	5.84%
Total fixed rate debt		$ 1,075,000	$ 1,075,000	0
Total floating rate debt		0	0	1,200,000
Due from joint ventures | 280 Park Avenue | Vornado Realty Trust | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		537,500	537,500	0
Total floating rate debt		$ 0	$ 0	600,000
Due from joint ventures | 245 Park Avenue | U.S. Affiliate of Mori Trust Co., Ltd
Debt Instrument [Line Items]
Economic Interest (as a percent)		50.10%	50.10%
Interest rate, fixed rate debt (as a percent)		4.30%	4.30%
Total fixed rate debt		$ 1,768,000	$ 1,768,000	1,768,000
Due from joint ventures | 245 Park Avenue | U.S. Affiliate of Mori Trust Co., Ltd | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 885,768	$ 885,768	885,768
Due from joint ventures | One Madison Avenue | National Pension Service of Korea / Hines Interest LP / International Investor
Debt Instrument [Line Items]
Economic Interest (as a percent)		25.50%	25.50%
Interest rate, fixed rate debt (as a percent)		7.10%	7.10%
Interest rate, floating rate debt (as a percent)		3.10%	3.10%
Total fixed rate debt		$ 658,357	$ 658,357	733,103
Total floating rate debt		354,757	354,757	0
Due from joint ventures | One Madison Avenue | National Pension Service of Korea / Hines Interest LP / International Investor | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		167,881	167,881	186,941
Total floating rate debt		$ 90,463	$ 90,463	0
Due from joint ventures | Worldwide Plaza | RXR Realty / New York REIT
Debt Instrument [Line Items]
Economic Interest (as a percent)		24.95%	24.95%
Interest rate, fixed rate debt (as a percent)		3.98%	3.98%
Total fixed rate debt		$ 1,200,000	$ 1,200,000	1,200,000
Due from joint ventures | Worldwide Plaza | RXR Realty / New York REIT | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 299,400	$ 299,400	299,400
Due from joint ventures | 220 East 42nd Street | A fund managed by Meritz Alternative Investment Management
Debt Instrument [Line Items]
Economic Interest (as a percent)		51%	51%
Interest rate, fixed rate debt (as a percent)		6.77%	6.77%
Total fixed rate debt		$ 496,412	$ 496,412	505,412
Due from joint ventures | 220 East 42nd Street | A fund managed by Meritz Alternative Investment Management | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 253,170	$ 253,170	257,760
Due from joint ventures | One Vanderbilt Avenue | National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		2.95%	2.95%
Total fixed rate debt		$ 3,000,000	$ 3,000,000	3,000,000
Due from joint ventures | One Vanderbilt Avenue | National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		1,800,300	1,800,300	2,130,300
Due from joint ventures | 5 Times Square | RXR Realty led investment group
Debt Instrument [Line Items]
Total fixed rate debt		0	0	477,783
Total floating rate debt		0	0	610,010
Due from joint ventures | 5 Times Square | RXR Realty led investment group | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		0	0	150,740
Total floating rate debt		$ 0	$ 0	192,458
Due from joint ventures | 625 Madison Avenue | Private Investors
Debt Instrument [Line Items]
Economic Interest (as a percent)		90.93%	90.93%
Total fixed rate debt		$ 0	$ 0	199,987
Due from joint ventures | 625 Madison Avenue | Private Investors | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		0	0	180,848
Due from joint ventures | 10 East 53rd Street | Canadian Pension Plan Investment Board
Debt Instrument [Line Items]
Total fixed rate debt		0	0	220,000
Due from joint ventures | 10 East 53rd Street | Canadian Pension Plan Investment Board | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		0	0	121,000
Due from joint ventures | 717 Fifth Avenue | Wharton Properties / Private Investor
Debt Instrument [Line Items]
Total fixed rate debt		0	0	655,328
Due from joint ventures | 717 Fifth Avenue | Wharton Properties / Private Investor | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 0	$ 0	71,536
Due from joint ventures | 11 West 34th Street | Private Investor / Wharton Properties
Debt Instrument [Line Items]
Economic Interest (as a percent)		30%	30%
Interest rate, floating rate debt (as a percent)		1.45%	1.45%
Total floating rate debt		$ 23,000	$ 23,000	23,000
Due from joint ventures | 11 West 34th Street | Private Investor / Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 6,900	$ 6,900	6,900
Due from joint ventures | 1552 Broadway | Wharton Properties
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.75%	2.75%
Total floating rate debt		$ 193,132	$ 193,132	193,133
Due from joint ventures | 1552 Broadway | Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 96,566	$ 96,566	96,567
Due from joint ventures | 2 Herald Square | Israeli Institutional Investor
Debt Instrument [Line Items]
Economic Interest (as a percent)		95%	95%
Total floating rate debt		$ 0	$ 0	182,500
Due from joint ventures | 2 Herald Square | Israeli Institutional Investor | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 0	$ 0	93,075
Due from joint ventures | 100 Park Avenue | Prudential Real Estate Investors
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)
Total floating rate debt		$ 0	$ 0	360,000
Due from joint ventures | 100 Park Avenue | Prudential Real Estate Investors | Common Stock
Debt Instrument [Line Items]
Total floating rate debt		$ 0	$ 0	179,640
Due from joint ventures | Mortgage loan | 650 Fifth Avenue | Wharton Properties
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		5.45%	5.45%
Total fixed rate debt		$ 65,000	$ 65,000	65,000
Due from joint ventures | Mortgage loan | 650 Fifth Avenue | Wharton Properties | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		$ 32,500	$ 32,500	32,500
Due from joint ventures | Mortgage loan | 1515 Broadway | Allianz Real Estate of America
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.93%	3.93%
Total fixed rate debt		$ 740,947	$ 740,947	762,002
Due from joint ventures | Mortgage loan | 1515 Broadway | Allianz Real Estate of America | Common Stock
Debt Instrument [Line Items]
Total fixed rate debt		421,369	421,369	$ 433,344
Due from joint ventures | Construction Loans | One Madison Avenue
Debt Instrument [Line Items]
Maximum facility capacity		$ 1,250,000	$ 1,250,000

Investments in Unconsolidated_7

Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Commercial real estate property, net		$ 4,481,660	$ 4,134,860
Cash and restricted cash		184,294	221,823	$ 203,273
Tenant and other receivables, related party receivables, and deferred rents receivable		44,055	33,270
Right of use asset - operating leases		865,639	885,929
Other assets		610,911	413,670
Total assets	[1]	10,470,099	9,531,181
Liabilities and equity
Mortgages and other loans payable, net		1,944,635	1,491,319
Lease liabilities		810,989	827,692
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)		414,153	471,401
Equity		4,069,951	3,855,925	4,646,922	$ 4,778,253
Total liabilities and equity/capital		10,470,099	9,531,181
Company's investments in unconsolidated joint ventures		2,690,138	2,983,313
Investments difference between carrying amount and underlying equity		480,800
Combined statements of income for the unconsolidated joint ventures
Revenues		886,272	913,710	919,454
Real estate taxes		128,187	143,757	138,228
Operating lease rent		24,423	27,292	26,943
Interest expense, net of interest income		147,220	137,114	89,473
Amortization of deferred financing costs		6,619	7,837	7,817
Depreciation and amortization		207,443	247,810	216,167
Total expenses		916,181	990,296	838,752
Gain (loss) on early extinguishment of debt		43,762	(870)	0
Depreciable real estate reserves and impairments		(181,798)	0	0
Net income (loss)		30,222	(599,337)	(76,303)
Company's equity in net (loss) income from unconsolidated joint ventures		(179,695)	(76,509)	(57,958)
Due from joint ventures
Assets
Commercial real estate property, net		15,327,542	17,561,406
Cash and restricted cash		649,426	656,038
Tenant and other receivables, related party receivables, and deferred rents receivable		621,748	673,532
Debt and preferred equity investments, net		236,512	0
Right of use asset - operating leases		919,658	905,934
Other assets		1,739,549	2,584,765
Total assets		19,494,435	22,381,675
Liabilities and equity
Mortgages and other loans payable, net		12,234,261	14,799,277
Deferred revenue		956,217	1,108,180
Lease liabilities		1,008,085	990,276
Other liabilities (includes $251,096 and $259,392 at fair value as of December 31, 2024 and December 31, 2023, respectively)		519,582	447,705
Equity		4,776,290	5,036,237
Total liabilities and equity/capital		19,494,435	22,381,675
Company's investments in unconsolidated joint ventures		2,690,138
Combined statements of income for the unconsolidated joint ventures
Revenues		1,484,459	1,525,044	1,339,364
Payments made for services		259,558	253,630	240,002
Real estate taxes		297,520	287,462	252,806
Operating lease rent		33,207	29,048	26,152
Interest expense, net of interest income		573,148	574,032	431,865
Amortization of deferred financing costs		21,289	28,157	27,754
Depreciation and amortization		538,390	516,466	465,100
Total expenses		1,723,112	1,688,795	1,443,679
Gain (loss) on early extinguishment of debt		233,704	0	(467)
Net income (loss)		(186,747)	(163,751)	(104,782)
Company's equity in net (loss) income from unconsolidated joint ventures		$ (179,695)	$ (76,509)	$ (57,958)
[1] (1) The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $236.7 million and $41.2 million of land, $159.1 million and $40.5 million of building and improvements, $— million and $— million of building and leasehold improvements, $— million and $— million of right of use assets, $4.1 million and $5.4 million of accumulated depreciation, 709.1 million and — million of real estate loans held by consolidated securitization vehicles, $830.3 million and $676.9 million of other assets included in other line items, $357.9 million and $50.0 million of real estate debt, net, $1.1 million and $0.9 million of accrued interest payable, $— million and $— million of lease liabilities, 590.1 million and — million of senior obligations of consolidated securitization vehicles and $324.8 million and $306.5 million of other liabilities included in other line items as of December 31, 2024 and December 31, 2023, respectively.

Deferred Costs (Details)

Deferred Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs	$ 426,055	$ 399,224
Less: accumulated amortization	(308,923)	(287,761)
Deferred costs, net	$ 117,132	$ 111,463

Mortgages and Other Loans Pay_3

Mortgages and Other Loans Payable - Schedule of Mortgages and Other Loans Payable (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total fixed rate debt	$ 1,587,474	$ 1,387,386
Total floating rate debt	363,550	110,000
Total mortgages and other loans payable	1,951,024	1,497,386
Deferred financing costs, net of amortization	(6,389)	(6,067)
Total mortgages and other loans payable, net	1,944,635	1,491,319
10 East 53rd Street
Debt Instrument [Line Items]
Total fixed rate debt	205,000	0
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt	370,000	370,000
7 Dey / 185 Broadway
Debt Instrument [Line Items]
Total fixed rate debt	190,148	190,148
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt	100,000	100,000
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	450,000	450,000
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt	272,326	277,238
CMBS Repurchase Facility
Debt Instrument [Line Items]
Total floating rate debt	3,550	0
100 Park Avenue
Debt Instrument [Line Items]
Total floating rate debt	360,000	0
690 Madison Avenue
Debt Instrument [Line Items]
Total floating rate debt	0	60,000
719 Seventh Avenue
Debt Instrument [Line Items]
Total floating rate debt	$ 0	$ 50,000
Weighted Average | 10 East 53rd Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.45%
Weighted Average | 100 Church Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.89%
Weighted Average | 7 Dey / 185 Broadway
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	6.65%
Weighted Average | Landmark Square
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.90%
Weighted Average | 485 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.25%
Weighted Average | 420 Lexington Avenue
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	8.24%
Weighted Average | CMBS Repurchase Facility
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	1.75%
Weighted Average | 100 Park Avenue
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)	2.25%

Mortgages and Other Loans Pay_4

Mortgages and Other Loans Payable - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Mortgages and Other Loans Payable [Line Items]
Book value of collateral	$ 2,200,000	$ 1,900,000
Revolving credit facility, net	316,240	554,752
Total floating rate debt	363,550	110,000
CMBS Repurchase Facility
Mortgages and Other Loans Payable [Line Items]
Total floating rate debt	$ 3,550	$ 0

Corporate Indebtedness - Additi

Corporate Indebtedness - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) extension	Nov. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Corporate Indebtedness
Outstanding under line of credit facility	$ 316,240,000		$ 554,752,000
2012 Credit Facility
Corporate Indebtedness
Credit facility, maximum borrowing capacity	1,150,000,000
Letters of credit	7,500,000
Ability to borrow under line of credit facility	$ 922,500,000
Revolving credit facility
Corporate Indebtedness
Facility fee (as a percent)	0.30%
Outstanding under line of credit facility	$ 320,000,000
Revolving credit facility | Minimum
Corporate Indebtedness
Facility fee (as a percent)	0.125%
Revolving credit facility | Maximum
Corporate Indebtedness
Facility fee (as a percent)	0.30%
Line of Credit | Term loan
Corporate Indebtedness
Long-term debt	$ 1,100,000,000		1,200,000,000
Line of Credit | 2012 Credit Facility
Corporate Indebtedness
Long-term debt	316,200,000		$ 554,800,000
Term loan | Term Loan A, Maturity March 31, 2023
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,050,000,000
Interest rate added to base rate (as a percent)	1.60%
Term loan | Term Loan A, Maturity March 31, 2023 | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.80%
Term loan | Term Loan A, Maturity March 31, 2023 | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.60%
Term loan | Term Loan B, Maturity November 21, 2024
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 200,000,000
Interest rate added to base rate (as a percent)	1.80%
Term loan | Term Loan B, Maturity November 21, 2024 | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.85%
Term loan | Term Loan B, Maturity November 21, 2024 | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.65%
Term loan | Term Loan B, Maturity November 19, 2025
Corporate Indebtedness
Gross long-term debt		$ 100,000,000
Revolving credit facility | Line of Credit
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.10%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,250,000,000
Number of extensions | extension	2
Term of extension	6 months
Maximum borrowing capacity, optional expansion	$ 4,500,000,000
Interest rate added to base rate (as a percent)	1.40%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	0.725%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	1.40%

Corporate Indebtedness - Senior

Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt disclosures by scheduled maturity date
Accreted Balance	$ 1,146,010	$ 1,244,881
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	100,000	100,000
Deferred financing costs, net	(103)	(205)
Senior notes, net of deferred finance costs	99,897	99,795
Senior unsecured notes | 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance	100,000
Accreted Balance	$ 100,000	$ 100,000
Coupon Rate (as a percent)	4.27%
Initial Term (in Years)	10 years

Corporate Indebtedness - Junior

Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2005 USD ($)	Dec. 31, 2024 USD ($) quarter
Principal Repayments and Joint Venture Debt
2025		$ 473,551
2026		290,148
2027		2,280,000
2028		205,000
2029		0
Thereafter		372,325
Repayments of principal		$ 3,621,024
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000
Interest rate added to base rate (as a percent)		0.26%
Interest payment deferment, number of consecutive quarters | quarter		8
Due from joint ventures
Principal Repayments and Joint Venture Debt
2025		$ 1,198,400
2026		936,639
2027		1,710,229
2028		382,294
2029		0
Thereafter		1,800,300
Repayments of principal		6,027,862
Due from joint ventures | Mortgages and other loans payable
Scheduled Amortization
2025		0
2026		0
2027		0
2028		0
2029		0
Thereafter		0
Future Amortization of Debt		0
Principal Repayments and Joint Venture Debt
2025		373,551
2026		190,148
2027		910,000
2028		205,000
2029		0
Thereafter		272,325
Repayments of principal		1,951,024
Due from joint ventures | Revolving Credit Facility
Principal Repayments and Joint Venture Debt
2025		0
2026		0
2027		320,000
2028		0
2029		0
Thereafter		0
Repayments of principal		320,000
Due from joint ventures | Unsecured Term Loans
Principal Repayments and Joint Venture Debt
2025		0
2026		100,000
2027		1,050,000
2028		0
2029		0
Thereafter		0
Repayments of principal		1,150,000
Due from joint ventures | Trust Preferred Securities
Principal Repayments and Joint Venture Debt
2025		0
2026		0
2027		0
2028		0
2029		0
Thereafter		100,000
Repayments of principal		100,000
Due from joint ventures | Senior Unsecured Notes
Principal Repayments and Joint Venture Debt
2025		100,000
2026		0
2027		0
2028		0
2029		0
Thereafter		0
Repayments of principal		$ 100,000

Corporate Indebtedness - Schedu

Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest expense
Interest expense before capitalized interest	$ 196,334	$ 228,840	$ 166,493
Interest on financing leases	4,502	4,446	4,555
Capitalized interest	(50,148)	(95,980)	(82,444)
Amortization of discount on assumed debt	494	2,842	1,855
Interest income	(3,962)	(3,034)	(986)
Interest expense, net	$ 147,220	$ 137,114	$ 89,473

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Jul. 31, 2024	Apr. 30, 2024	Dec. 31, 2016	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Profit participation from related party				$ 103,726	$ 77,410	$ 77,793
Operating lease rent				24,423	27,292	26,943
Total rental revenue				605,999	683,335	671,500
Related party receivables				26,865	12,168
One Vanderbilt Avenue
Related Party Transaction [Line Items]
Operating lease rent				3,000	3,000	3,000
SUMMIT One Vanderbilt
Related Party Transaction [Line Items]
Operating lease rent				41,400	38,900	33,000
Total rental revenue				27,700	26,200	22,800
Due from joint ventures
Related Party Transaction [Line Items]
Operating lease rent				33,207	29,048	$ 26,152
Related party receivables				19,199	10,603
Other
Related Party Transaction [Line Items]
Related party receivables				$ 7,666	$ 1,565
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue
Related Party Transaction [Line Items]
Amount of related party transaction			$ 1,400
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue | Minimum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors			1.27%
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue | Maximum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors			0.85%
Andrew Mathias, President | One Vanderbilt Avenue
Related Party Transaction [Line Items]
Amount of related party transaction			$ 1,000
Andrew Mathias, President | One Vanderbilt Avenue | Minimum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors			1.92%
Andrew Mathias, President | One Vanderbilt Avenue | Maximum | Related party
Related Party Transaction [Line Items]
Percentage of profits due to investors			1.28%
Holiday And Mathias | One Vanderbilt Avenue | Related party
Related Party Transaction [Line Items]
Stabilization of property, within three years after stabilization, percent					50%
Stabilization period				3 years
Stabilization of property, three years or more after stabilization, percent				100%
Stabilization of property, anniversary period				7 years
Andrew Mathias | Related party | 719 Seventh Avenue
Related Party Transaction [Line Items]
Proceeds from sale of property		$ 30,500
Expected equity ownership percentage		40%
Equity interest held by partner		$ 7,000
Holliday | 760 Madison Avenue
Related Party Transaction [Line Items]
Proceeds from sale of property	$ 8,400

Noncontrolling Interests on t_3

Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Distributions	$ (11,053)	$ (2,777)	$ (4,699)
Acquisition of subsidiary interest from noncontrolling interest	(9,216)		(29,817)
Net income (loss)	497	(37,465)	(5,794)
Accumulated other comprehensive income (loss) allocation	$ 151	$ (1,960)	5,827
SL Green Operating Partnership
Organization
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)	4,509,953	3,949,448
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Distributions	$ (11,053)	$ (2,777)	(4,699)
Acquisition of subsidiary interest from noncontrolling interest	(9,216)		(29,817)
Accumulated other comprehensive income (loss) allocation	$ 151	$ (1,960)	5,827
SL Green Operating Partnership | Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	5.97%	5.75%
SL Green Operating Partnership | Series A Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	6%
Preferred Units, shares authorized (in shares)	109,161
Number of preferred units issued (in shares)	109,161
Preferred units, shares outstanding (in shares)	109,161
Annual dividends on preferred units (in dollars per share)	$ 60
Liquidation preference of preferred units (in dollars per share)	1,000
Conversion Price Per Unit (in dollars per share)	$ 0
SL Green Operating Partnership | Series F Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	7%
Preferred Units, shares authorized (in shares)	60
Number of preferred units issued (in shares)	60
Preferred units, shares outstanding (in shares)	60
Annual dividends on preferred units (in dollars per share)	$ 70
Liquidation preference of preferred units (in dollars per share)	1,000
Conversion Price Per Unit (in dollars per share)	$ 29.12
SL Green Operating Partnership | Series K Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	3.50%
Preferred Units, shares authorized (in shares)	700,000
Number of preferred units issued (in shares)	563,954
Preferred units, shares outstanding (in shares)	341,677
Annual dividends on preferred units (in dollars per share)	$ 0.8750
Liquidation preference of preferred units (in dollars per share)	25
Conversion Price Per Unit (in dollars per share)	$ 134.67
SL Green Operating Partnership | Series L Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	4%
Preferred Units, shares authorized (in shares)	500,000
Number of preferred units issued (in shares)	378,634
Preferred units, shares outstanding (in shares)	272,783
Annual dividends on preferred units (in dollars per share)	$ 1
Liquidation preference of preferred units (in dollars per share)	25
Conversion Price Per Unit (in dollars per share)	$ 0
SL Green Operating Partnership | Series R Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	3.50%
Preferred Units, shares authorized (in shares)	400,000
Number of preferred units issued (in shares)	400,000
Preferred units, shares outstanding (in shares)	400,000
Annual dividends on preferred units (in dollars per share)	$ 0.8750
Liquidation preference of preferred units (in dollars per share)	25
Conversion Price Per Unit (in dollars per share)	$ 154.89
SL Green Operating Partnership | Series S Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	4%
Preferred Units, shares authorized (in shares)	1,077,280
Number of preferred units issued (in shares)	1,077,280
Preferred units, shares outstanding (in shares)	1,077,280
Annual dividends on preferred units (in dollars per share)	$ 1
Liquidation preference of preferred units (in dollars per share)	25
Conversion Price Per Unit (in dollars per share)	$ 0
SL Green Operating Partnership | Series V Preferred Stock
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	5%
Preferred Units, shares authorized (in shares)	40,000
Number of preferred units issued (in shares)	40,000
Preferred units, shares outstanding (in shares)	40,000
Annual dividends on preferred units (in dollars per share)	$ 1.2500
Liquidation preference of preferred units (in dollars per share)	25
Conversion Price Per Unit (in dollars per share)	$ 0
SL Green Operating Partnership | Series W
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Preferred Units, shares authorized (in shares)	1
Number of preferred units issued (in shares)	1
Preferred units, shares outstanding (in shares)	1
Preferred stock, dividend, multiplier per common unit distribution	1,350
Partnership Interest
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period	$ 238,051	$ 269,993
Distributions	(13,915)	(14,779)
Issuance of common units	20,790	25,365
Acquisition of subsidiary interest from noncontrolling interest	(28,663)	(18,589)
Net income (loss)	497	(37,465)
Accumulated other comprehensive income (loss) allocation	151	(1,960)
Fair value adjustment	72,030	15,486
Balance at end of period	$ 288,941	$ 238,051	$ 269,993

Noncontrolling Interests on t_4

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

Stockholders' Equity of the C_3

Stockholders' Equity of the Company - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Authorized capital stock (in shares)		260,000,000
Authorized shares, par value (in dollars per share)		$ 0.01
Common stock, shares authorized (in shares)		160,000,000	160,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Excess stock, shares authorized (shares)		75,000,000
Excess stock, par value (in dollars per share)		$ 0.01
Preferred stock, shares authorized (shares)		25,000,000
Preferred stock, par (in dollars per share)		$ 0.01
Excess shares issued (shares)		0
Excess shares outstanding (in shares)		0
Number of shares issued (in shares)	5,063,291
Share price (in dollars per share)	$ 79
Proceeds from issuance of common stock	$ 386,300	$ 386,790	$ 0	$ 0
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	5,063,291
SL Green Operating Partnership
Class of Stock [Line Items]
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)		4,510,000	3,949,000
Common Stock
Class of Stock [Line Items]
Shares, outstanding (in shares)		71,097,000	64,726,000	64,380,000	64,105,000
Common Stock | SL Green Operating Partnership
Class of Stock [Line Items]
Shares, issued (in shares)		71,096,743
Shares, outstanding (in shares)		71,096,743

Stockholders' Equity of the C_4

Stockholders' Equity of the Company - Stock Repurchase Program (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) shares
Class of Stock [Line Items]
Number of shares purchased (in shares)	0
2016 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount, total | $	$ 3,500,000,000
Number of shares purchased (in shares)	36,107,719

Stockholders' Equity of the C_5

Stockholders' Equity of the Company - At-the-Market Equity Offering Program and Perpetual Preferred Stock (Details) - Series I Preferred Stock - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2012	Dec. 31, 2024	Dec. 31, 2023
Stockholders' Equity
Preferred stock, shares outstanding (in shares)		9,200,000	9,200,000
Dividend rate preferred units (as a percent)		6.50%
Perpetual Preferred stock, liquidation preference (in dollars per share)		$ 25	$ 25
Perpetual Preferred stock, annual dividends per share (in dollars per share)		$ 1.625
Contributions of net proceeds from sale of preferred stock	$ 221.9

Stockholders' Equity of the C_6

Stockholders' Equity of the Company - Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Feb. 29, 2024
Stockholders' Equity
Common stock, shares authorized (in shares)		160,000,000	160,000,000
Dividend reinvestments/stock purchases under the DRSPP	$ 386,300	$ 386,790	$ 0	$ 0
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity
Common stock, shares authorized (in shares)					3,500,000
Issuance of common stock (in shares)		728,352	17,180	10,839
Dividend reinvestments/stock purchases under the DRSPP		$ 52,308	$ 525	$ 525

Stockholders' Equity of the C_7

Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic Earnings:
Income (loss) attributable to SL Green common stockholders	$ 7,060	$ (579,509)	$ (93,024)
Less: distributed earnings allocated to participating securities	(1,835)	(2,655)	(2,219)
Less: undistributed earnings allocated to participating securities	(64)	0	0
Net income (loss) attributable to SL Green common stockholders (numerator for basic earnings per share)	5,161	(582,164)	(95,243)
Effect of Dilutive Securities:
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	0	0	0
Add back: undistributed earnings allocated to participating securities	0	0	0
Add back: effect of dilutive securities (redemption of units to common shares)	0	(37,465)	(5,794)
Net (loss) income attributable to SL Green common stockholders, diluted	$ 5,161	$ (619,629)	$ (101,037)
Basic Shares:
Weighted average common stock outstanding (in shares)	65,062,000	63,809,000	63,917,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (in shares)	0	4,163,000	4,012,000
Stock-based compensation plans (in shares)	626,000	0	0
Diluted weighted average common stock outstanding (in shares)	65,688,000	67,972,000	67,929,000
Common stock shares excluded from the diluted shares outstanding (in shares)	4,717,759

Partners' Capital of the Oper_3

Partners' Capital of the Operating Partnership - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Series I Preferred Units
Stockholders' Equity
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000
Common Stock
Stockholders' Equity
Units, outstanding (in units)	71,097,000	64,726,000	64,380,000	64,105,000
SL Green Operating Partnership
Stockholders' Equity
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	4,509,953	3,949,448
SL Green Operating Partnership | Operating Partnership
Stockholders' Equity
Noncontrolling interest in the operating partnership (as a percent)	5.97%	5.75%
SL Green Operating Partnership | Series I Preferred Units
Stockholders' Equity
Common units redemption, period of restriction	1 year
Conversion of stock, shares issued (in shares)	1
SL Green Operating Partnership | Common Stock
Stockholders' Equity
Units, outstanding (in units)	71,096,743
Shares, issued (in shares)	71,096,743

Partners' Capital of the Oper_4

Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator
Less: distributed earnings allocated to participating securities	$ (1,835)	$ (2,655)	$ (2,219)
Net income (loss) attributable to SL Green common stockholders (numerator for basic earnings per share)	5,161	(582,164)	(95,243)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	$ 0	$ 0	$ 0
Denominator
Diluted weighted average common stock outstanding (in shares)	65,688,000	67,972,000	67,929,000
Common stock shares excluded from the diluted shares outstanding (in shares)	4,717,759
SL Green Operating Partnership
Numerator
Net Income (loss) attributable to SLGOP common unitholders (numerator for diluted earnings per unit)	$ 7,557	$ (616,974)	$ (98,818)
Less: distributed earnings allocated to participating securities	(4,665)	(2,655)	(2,219)
Net income (loss) attributable to SL Green common stockholders (numerator for basic earnings per share)	2,892	(619,629)	(101,037)
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	26	0	0
Income (loss) attributable to SLGOP common unitholders	$ 2,918	$ (619,629)	$ (101,037)
Denominator
Basic weighted average common units outstanding (in shares)		67,972,000	67,929,000
Stock-based compensation plans (in shares)	757,000	0	0
Contingently issuable units (in shares)	112,000	0	0
Diluted weighted average common stock outstanding (in shares)	69,605,000	67,972,000	67,929,000
Common stock shares excluded from the diluted shares outstanding (in shares)	800,881	1,273,417	1,682,236

Share-based Compensation - Addi

Share-based Compensation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) unit / shares fungibleUnit $ / shares shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of option (in years)	7 years 6 months
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options | $	$ 1,700,000	$ 1,400,000	$ 1,800,000
Stock options, stock appreciation rights and other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of option (in years)	5 years
All other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) | unit / shares	1
Expected life of option (in years)	10 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of commencement of option vesting, from date of grant (in years)	1 year
Granted (in shares) | shares	217,917	0	0
Remaining weighted average contractual life of the options outstanding (in years)	6 years 10 months 24 days
Remaining weighted average contractual life of the options exercisable (in years)	2 years
Total unrecognized compensation cost related to unvested stock awards | $	$ 4,500,000
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)	5 years
Options vesting period (in years)	1 year
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period (in years)	10 years
Options vesting period (in years)	5 years
Class O LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred unit distributions as a percentage of common unit distributions	10%
Awards granted (in shares) | shares	217,917
Average share price (in dollars per share) | $ / shares	$ 100
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares) | shares	371,285	337,350	314,995
Compensation expense | $	$ 10,939,602	$ 7,766,055	$ 10,133,905
Total unrecognized compensation cost related to unvested stock awards | $	$ 33,300,000
Annual award vesting rate, low end of range (as a percent)	15%
Annual award vesting rate, high end of range (as a percent)	35%
Fair value of restricted stock vested during the period | $	$ 7,400,000	10,200,000	9,700,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)	2 years 3 months 18 days
Weighted average fair value of options granted during the period | $	$ 24,676,422	$ 15,789,540	$ 16,804,931
Awards outstanding (in shares) | shares	4,449,709	4,089,174	3,758,174	3,459,363
LTIP units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	0	0
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)	1 year 8 months 12 days
Weighted average fair value of options granted during the period | $	$ 34,100,000	$ 38,100,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock awards | $	31,000,000
Share-based compensation | $	$ 30,500,000	50,400,000	$ 43,500,000
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance (shares) | shares	500,000
Duration of each offering period starting the first day of each calendar quarter (in months)	3 months
Shares of common stock available for issuance (shares)	85%
Shares of common stock issued (shares) | shares	245,445
Fourth Amended and Restated 2003 Stock Option and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum fungible units that may be granted (in shares) | fungibleUnit	32,210,000
Fungible units per share (in fungible units per share) | unit / shares	2.59
Shares that may be issued if equal to fungible units (shares) (less than) | shares	32,210,000
Number of fungible units available for grant | fungibleUnit	1,500,000
Stock options, stock appreciation rights and other awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible units per share (in fungible units per share) | unit / shares	0.84
Third Amendment and Restated 2005 Stock Option and Incentive Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense | $	$ 0	$ 0	$ 0
Deferred Stock Compensation Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares) | shares	15,945
Compensation expense | $	$ 2,800,000
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)	100%
Shares issued (in shares) | shares	25,590
Awards outstanding (in shares) | shares	125,654

Share-based Compensation - Sche

Share-based Compensation - Schedule of Weighted Average Assumptions Used to Estimate the Grant Date Fair Value of Options Granted (Details)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Dividend yield (as a percent)	5.50%
Expected life of option (in years)	7 years 6 months
Risk-free interest rate (as a percent)	4.45%
Expected stock price volatility (as a percent)	45%

Share-based Compensation - Acti

Share-based Compensation - Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock options
Options Outstanding
Balance at beginning of year (in shares)	115,980	313,480	394,089
Granted (in shares)	217,917	0	0
Lapsed or cancelled (in shares)	0	(197,500)	(80,609)
Balance at end of period (in shares)	333,897	115,980	313,480
Options exercisable at end of period (in shares)	115,980	115,980	313,480
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 103.52	$ 97.59	$ 100.56
Granted (in dollars per share)	68.07	0	0
Lapsed or cancelled (in dollars per share)	0	84.14	112.14
Balance at end of period (in dollars per share)	81.63	103.52	97.59
Options exercisable at end of period (in dollars per share)	$ 103.52	$ 103.52	$ 97.59
Restricted Stock Awards
Summary of restricted stock
Balance at beginning of year (in shares)	4,089,174	3,758,174	3,459,363
Granted (in shares)	371,285	337,350	314,995
Cancelled (in shares)	(10,750)	(6,350)	(16,184)
Balance at end of period (in shares)	4,449,709	4,089,174	3,758,174
Vested during the period (in shares)	143,453	147,915	118,255
Compensation expense recorded	$ 10,939,602	$ 7,766,055	$ 10,133,905
Total fair value of restricted stock granted during the year	$ 24,676,422	$ 15,789,540	$ 16,804,931

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	$ 3,855,925	$ 4,646,922	$ 4,778,253
Ending balance	4,069,951	3,855,925	4,646,922
Deferred net losses from terminated hedges	(200)	(400)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	17,477	49,604	(46,758)
Other comprehensive income (loss) before reclassifications	46,089	22,670	100,346
Amounts reclassified from accumulated other comprehensive income	(45,370)	(54,797)	(3,984)
Ending balance	18,196	17,477	49,604
Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	25,352	47,800	(25,881)
Other comprehensive income (loss) before reclassifications	39,049	17,269	78,300
Amounts reclassified from accumulated other comprehensive income	(35,071)	(39,717)	(4,619)
Ending balance	29,330	25,352	47,800
Net unrealized (loss) gain on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	(1,791)	(242)	1,117
Other comprehensive income (loss) before reclassifications	525	(1,549)	(1,359)
Amounts reclassified from accumulated other comprehensive income	0	0	0
Ending balance	(1,266)	(1,791)	(242)
Due from joint ventures
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	5,036,237
Ending balance	4,776,290	5,036,237
Due from joint ventures | Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning balance	(6,084)	2,046	(21,994)
Other comprehensive income (loss) before reclassifications	6,515	6,950	23,405
Amounts reclassified from accumulated other comprehensive income	(10,299)	(15,080)	635
Ending balance	$ (9,868)	$ (6,084)	$ 2,046

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2021
Fair Value of Financial Instruments
Marketable securities available-for-sale	$ 17,323			$ 9,591
Interest rate cap and swap agreements (included in Other assets)	31,860			33,456
Real estate loans held by consolidated securitization vehicles	584,134
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	6,469			17,108
Senior obligations of consolidated securitization vehicles	567,487
Secured borrowing	251,096
Investment fair value adjustment			$ 17,000	17,000
Ownership percentage deconsolidated			50.10%
Debt and preferred equity investments	303,726			346,745
220 East 42nd Street
Fair Value of Financial Instruments
Ownership interest disposed			49.90%
Carrying Value
Fair Value of Financial Instruments
Fixed rate debt	3,257,474			3,237,386
Variable rate debt	363,550			270,000
Total debt	3,621,024			3,507,386
Fair Value
Fair Value of Financial Instruments
Total debt	3,581,131			3,453,125
Estimated fair value of debt and preferred equity investments, low end of range	300,000			300,000
Level 1
Fair Value of Financial Instruments
Marketable securities available-for-sale	0			0
Interest rate cap and swap agreements (included in Other assets)	0			0
Real estate loans held by consolidated securitization vehicles
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	0			0
Senior obligations of consolidated securitization vehicles
Secured borrowing
Level 2
Fair Value of Financial Instruments
Marketable securities available-for-sale	17,323			9,591
Interest rate cap and swap agreements (included in Other assets)	31,860			33,456
Real estate loans held by consolidated securitization vehicles	584,134
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	6,469			17,108
Senior obligations of consolidated securitization vehicles	567,487
Secured borrowing
Level 3
Fair Value of Financial Instruments
Marketable securities available-for-sale	0			0
Interest rate cap and swap agreements (included in Other assets)	0			0
Real estate loans held by consolidated securitization vehicles
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	0			0
Senior obligations of consolidated securitization vehicles
Secured borrowing	251,096
Level 3 | Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments	303,726			346,745
Level 3 | Fair Value
Fair Value of Financial Instruments
Fixed rate debt	3,225,767			3,184,338
Variable rate debt	$ 355,364			$ 268,787
National Pension Service of Korea / Hines Interest LP / International Investor | One Madison Avenue
Fair Value of Financial Instruments
Investment in joint venture aggregate maximum ownership percentage	25%				25%
10 East 53rd Street
Fair Value of Financial Instruments
Investment fair value adjustment	$ 117,800	$ 55,700

Financial Instruments_ Deriva_3

Financial Instruments: Derivatives and Hedging - Schedule of Notional and Fair Value of Derivative Financial Instruments and Foreign Currency Hedges (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financial Instruments: Derivatives and Hedging
Fair Value	$ 31,860	$ 33,456
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Fair Value	25,391
Interest Rate Swaps/Caps | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Fair Value	5,859
Interest Rate Cap Expiring in February 2025
Financial Instruments: Derivatives and Hedging
Notional Value	$ 205,000
Strike Rate	4%
Fair Value	$ 75
Interest Rate Cap Expiring in June 2025
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000
Strike Rate	3.25%
Fair Value	$ 1,653
Interest Rate Cap Expiring in June 2025 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000
Strike Rate	3.25%
Fair Value	$ (1,649)
Interest Rate Cap Expiring in July 2025
Financial Instruments: Derivatives and Hedging
Notional Value	$ 68,678
Strike Rate	4%
Fair Value	$ (102)
Interest Rate Swap Expiring January 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000
Strike Rate	2.621%
Fair Value	$ 2,196
Interest Rate Swap Expiring January 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	2.662%
Fair Value	$ 2,849
Interest Rate Swap Expiring December 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 125,000
Strike Rate	3.667%
Fair Value	$ 828
Interest Rate Swap Expiring December 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 125,000
Strike Rate	3.67%
Fair Value	$ 820
Interest Rate Swap Expiring in February 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	2.903%
Fair Value	$ 2,225
Interest Rate Swap Expiring in February 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	2.733%
Fair Value	$ 2,568
Interest Rate Swap Expiring in February 2027, 3
Financial Instruments: Derivatives and Hedging
Notional Value	$ 50,000
Strike Rate	2.463%
Fair Value	$ 1,557
Interest Rate Swap Expiring in February 2027, 4
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	2.591%
Fair Value	$ 5,711
Interest Rate Swap Expiring in May 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 300,000
Strike Rate	2.866%
Fair Value	$ 7,637
Interest Rate Swap Expiring in May 2027, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000
Strike Rate	3.524%
Fair Value	$ 1,618
Interest Rate Swap Expiring in June 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 370,000
Strike Rate	3.888%
Fair Value	$ 970
Interest Rate Swap Expiring in June 2027 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 68,678
Strike Rate	4.466%
Fair Value	$ (765)
Interest Rate Swap Expiring in November 2027
Financial Instruments: Derivatives and Hedging
Notional Value	$ 300,000
Strike Rate	4.487%
Fair Value	$ (3,953)
Interest Rate Swap Expiring in January 2028
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	3.756%
Fair Value	$ 722
Interest Rate Swap Expiring in May 2028
Financial Instruments: Derivatives and Hedging
Notional Value	$ 204,963
Strike Rate	3.915%
Fair Value	$ 431
Interest Rate Cap Expiring May 2025 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 658,357
Strike Rate	4%
Fair Value	$ 727
Interest Rate Cap Expiring July 2025 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 285,000
Strike Rate	4%
Fair Value	$ 423
Interest Rate Swap Expiring February 2026 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000
Strike Rate	3.608%
Fair Value	$ 1,309
Interest Rate Swap Expiring February 2026 2 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 250,000
Strike Rate	3.608%
Fair Value	$ 1,309
Interest Rate Swap Expiring February 2026 3 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 177,000
Strike Rate	1.555%
Fair Value	$ 4,964
Interest Rate Swap Expiring September 2026 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 268,750
Strike Rate	4.039%
Fair Value	$ (534)
Interest Rate Swap Expiring September 2026, 2 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 268,750
Strike Rate	4.058%
Fair Value	$ (711)
Interest Rate Swap Expiring September 2026, 3 | Due from joint ventures
Financial Instruments: Derivatives and Hedging
Notional Value	$ 537,500
Strike Rate	4.065%
Fair Value	$ (1,628)

Financial Instruments_ Deriva_4

Financial Instruments: Derivatives and Hedging - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments: Derivatives and Hedging
Fair value of derivatives in a net liability position	$ 6.7
Aggregate termination value	6.8
Interest Rate Cap
Financial Instruments: Derivatives and Hedging
Loss from changes in fair value	(5.5)	$ (10.4)	$ (1.7)
Interest Expense
Financial Instruments: Derivatives and Hedging
Loss from changes in fair value	0.1	$ (0.2)	$ (0.3)
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	(18.4)
Income Loss From Equity Method Investments
Financial Instruments: Derivatives and Hedging
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	$ (1.7)

Financial Instruments_ Deriva_5

Financial Instruments: Derivatives and Hedging - Schedule of Effect of Derivative Financial Instruments on Consolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$ 48,672	$ 25,883	$ 107,945
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	48,363	58,320	4,316
Due from joint ventures
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	6,870	7,399	24,783
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	10,965	16,050	(673)
Interest Rate Swaps/Caps
Financial Instruments: Derivatives and Hedging
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	41,802	18,484	83,162
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	$ 37,398	$ 42,270	$ 4,989

Lease Income - Future Minimum R

Lease Income - Future Minimum Rents (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Leases [Abstract]
2025	$ 544,452
2026	507,298
2027	454,095
2028	390,475
2029	355,565
Thereafter	1,402,994
Total payments to be received	$ 3,654,879

Lease Income - Lease Income (De

Lease Income - Lease Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Fixed lease payments	$ 545,573	$ 589,469	$ 583,107
Variable lease payments	63,004	79,641	82,676
Total lease payments	608,577	669,110	665,783
Amortization of acquired above and below-market leases	(2,578)	14,225	5,717
Total rental revenue	605,999	683,335	671,500
Sublease Income	188,500	196,500
Interest income	$ 4,500	$ 4,444	$ 4,389

Lease Income - Sales Type Lease

Lease Income - Sales Type Lease (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Leases [Abstract]
2025	$ 3,228
2026	3,276
2027	3,325
2028	3,375
2029	3,426
Thereafter	193,367
Total minimum lease payments	209,997
Amount representing interest	(103,044)
Investment in sales-type leases	$ 106,953

Benefit Plans (Details)

Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2021
Multiemployer Plans [Line Items]
Plan contributions	$ 9,153		$ 10,091		$ 9,145
Employee contribution limit per calendar year	15%
Employer matching contribution, percent of match	100%		100%		100%
Percentage of eligible compensation matched by employer	4%		4%		4%
Matching contribution	$ 2,300		$ 1,800		$ 1,500
Pension Plan
Multiemployer Plans [Line Items]
Multiemployer plans, surcharge	No
Plan contributions	$ 2,157	$ 530,300	2,111	$ 317,900	1,952	$ 305,700
Multiemployer plans, contributions by employer, percent	5%
Health Plan
Multiemployer Plans [Line Items]
Plan contributions	$ 6,256		7,191	$ 1,700,000	6,386	$ 1,900,000	$ 1,600,000
Multiemployer plans, contributions by employer, percent	5%
Other plans
Multiemployer Plans [Line Items]
Plan contributions	$ 740		$ 789		$ 807

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Other Commitments [Line Items]
Employment agreements with certain executives, minimum cash-based compensation for next fiscal year	$ 2,600,000
Financing leases
2025	3,228,000
2026	3,276,000
2027	3,325,000
2028	3,375,000
2029	3,426,000
Thereafter	193,368,000
Total minimum lease payments	209,998,000
Amount representing interest	(103,145,000)
Lease liabilities	106,853,000	$ 105,531,000
Non-cancellable operating leases
2025	53,595,000
2026	53,734,000
2027	53,746,000
2028	54,211,000
2029	54,443,000
Thereafter	1,154,422,000
Total minimum lease payments	1,424,151,000
Amount discounted using incremental borrowing rate	(613,162,000)
Lease liability - operating leases	$ 810,989,000	827,692,000
711 Third Avenue
Other Commitments [Line Items]
Ownership interest	50%
Belmont
Other Commitments [Line Items]
Loss reserves	$ 3,500,000	3,300,000
Ticonderoga
Other Commitments [Line Items]
Loss reserves	$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Lease Costs
Operating lease costs before capitalized operating lease costs	$ 24,423	$ 29,637	$ 33,773
Operating lease costs capitalized	0	(2,345)	(6,830)
Operating lease costs, net	24,423	27,292	26,943
Financing Lease Costs
Interest on financing leases before capitalized interest	4,502	4,446	4,555
Interest on financing leases, net	4,502	4,446	4,555
Financing lease costs, net	$ 4,502	$ 4,446	$ 4,555
Operating lease, weighted average discount rate, percent	4.46%
Operating lease, weighted average remaining lease term	27 years

Segment Information - Reportabl

Segment Information - Reportable Segment Profit or Loss (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment information
Number of reportable segments | segment	3
Revenues	$ 886,272	$ 913,710	$ 919,454
Expenses
SUMMIT Operator expenses	111,739	101,211	89,207
SUMMIT Operator tax expense	730	9,201	2,647
Real estate taxes	128,187	143,757	138,228
Operating lease rent	24,423	27,292	26,943
Real Estate segment Net operating income	730,630	598,694	605,567
Equity in net loss (income) from unconsolidated joint ventures	(179,695)	(76,509)	(57,958)
Loan loss and other investment reserves, net of recoveries	0	(6,890)	0
Depreciation and amortization	(207,443)	(247,810)	(216,167)
Interest expense, net of interest income	(147,220)	(137,114)	(89,473)
Interest expense on senior obligations of consolidated securitization vehicles	(14,634)	0	0
Non-operating net loss from unconsolidated joint ventures	291,131	282,203	253,466
Marketing, general and administrative	(85,187)	(111,389)	(93,798)
Transaction related costs	(401)	(1,099)	(409)
Gain on early extinguishment of debt	43,762	(870)	0
Depreciable real estate reserves	(104,071)	(382,374)	(6,313)
Depreciable real estate reserves in unconsolidated joint venture	(263,190)
Gain on sale of real estate, net	3,025	(32,370)	(84,485)
Purchase price and other fair value adjustments	88,966	(17,260)	(8,118)
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate	208,144	(13,368)	(131)
Depreciation and amortization	(205,007)	(246,063)	(215,305)
Amortization of deferred financing costs	(6,619)	(7,837)	(7,817)
Interest expense, net of interest income	(119,078)	(102,965)	(64,340)
Net income (loss)	30,222	(599,337)	(76,303)
Operating Segments
Expenses
Net income (loss)	30,379	(233)	52,312
Operating Segments | Real Estate Segment
Segment information
Revenues	709,725	760,745	749,293
Expenses
SUMMIT Operator expenses	0	0	0
SUMMIT Operator tax expense	0	0	0
Operating Expenses	189,598	196,696	174,063
Real estate taxes	128,187	143,757	26,943
Operating lease rent	24,423	27,292	138,228
Net operating income from unconsolidated joint ventures	363,113	205,694	195,508
Real Estate segment Net operating income	730,630	598,694	605,567
Operating Segments | SUMMIT Segment
Segment information
Revenues	133,214	118,260	89,048
Expenses
SUMMIT Operator expenses	111,739	101,211	89,207
SUMMIT Operator tax expense	730	9,201	2,647
Operating Expenses	0	0	0
Real estate taxes	0	0	0
Operating lease rent	0	0	0
Equity in net loss (income) from unconsolidated joint ventures	0
Loan loss and other investment reserves, net of recoveries		0
Depreciation and amortization	(2,436)	(1,747)	(862)
Interest expense, net of interest income	0	0	0
Interest expense on senior obligations of consolidated securitization vehicles	0
Net income (loss)	18,309	6,101	(3,668)
Operating Segments | DPE Segment
Segment information
Revenues	43,333	34,705	81,113
Expenses
SUMMIT Operator expenses	0	0	0
SUMMIT Operator tax expense	0	0	0
Operating Expenses	0	0	0
Real estate taxes	0	0	0
Operating lease rent	0	0	0
Equity in net loss (income) from unconsolidated joint ventures	11,513
Loan loss and other investment reserves, net of recoveries		6,890
Depreciation and amortization	0	0	0
Interest expense, net of interest income	(28,142)	(34,149)	(25,133)
Interest expense on senior obligations of consolidated securitization vehicles	(14,634)
Net income (loss)	$ 12,070	$ (6,334)	$ 55,980

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 1,947,474
Initial Cost
Land	1,504,523
Building & Improvements	4,645,400
Cost Capitalized Subsequent To Acquisition
Land	(147,482)
Building & Improvements	605,300
Gross Amount at Which Carried at Close of Period
Land	1,357,041
Building & Improvements	5,250,700
Total	6,607,741	$ 6,102,864	$ 9,198,799	$ 7,650,907
Accumulated Depreciation	2,126,081	$ 1,968,004	$ 2,039,554	$ 1,896,199
420 Lexington Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	272,326
Initial Cost
Land	0
Building & Improvements	333,499
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	79,607
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	413,106
Total	413,106
Accumulated Depreciation	233,848
711 Third Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	19,844
Building & Improvements	115,769
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	16,578
Gross Amount at Which Carried at Close of Period
Land	19,844
Building & Improvements	132,347
Total	152,191
Accumulated Depreciation	84,768
555 W. 57th Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	18,846
Building & Improvements	140,946
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	21,526
Gross Amount at Which Carried at Close of Period
Land	18,846
Building & Improvements	162,472
Total	181,318
Accumulated Depreciation	103,967
461 Fifth Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Building & Improvements	88,276
Cost Capitalized Subsequent To Acquisition
Land	28,873
Building & Improvements	15,200
Gross Amount at Which Carried at Close of Period
Land	28,873
Building & Improvements	103,476
Total	132,349
Accumulated Depreciation	49,460
750 Third Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	51,093
Building & Improvements	251,523
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	114,773
Gross Amount at Which Carried at Close of Period
Land	51,093
Building & Improvements	366,296
Total	417,389
Accumulated Depreciation	115,992
485 Lexington Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	450,000
Initial Cost
Land	78,282
Building & Improvements	452,631
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	(4,635)
Gross Amount at Which Carried at Close of Period
Land	78,282
Building & Improvements	447,996
Total	526,278
Accumulated Depreciation	217,606
810 Seventh Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	114,077
Building & Improvements	550,819
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	13,809
Gross Amount at Which Carried at Close of Period
Land	114,077
Building & Improvements	564,628
Total	678,705
Accumulated Depreciation	252,324
1185 Avenue of the Americas
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	0
Building & Improvements	791,106
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	46,785
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	837,891
Total	837,891
Accumulated Depreciation	418,159
1350 Avenue of the Americas
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	90,941
Building & Improvements	431,517
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	26,318
Gross Amount at Which Carried at Close of Period
Land	90,941
Building & Improvements	457,835
Total	548,776
Accumulated Depreciation	211,252
1-6 Landmark Square
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	100,000
Initial Cost
Land	27,852
Building & Improvements	161,343
Cost Capitalized Subsequent To Acquisition
Land	(6,939)
Building & Improvements	(13,804)
Gross Amount at Which Carried at Close of Period
Land	20,913
Building & Improvements	147,539
Total	168,452
Accumulated Depreciation	51,883
7 Landmark Square
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	1,721
Building & Improvements	8,417
Cost Capitalized Subsequent To Acquisition
Land	(1,338)
Building & Improvements	(6,235)
Gross Amount at Which Carried at Close of Period
Land	383
Building & Improvements	2,182
Total	2,565
Accumulated Depreciation	783
100 Church Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	370,000
Initial Cost
Land	34,994
Building & Improvements	183,932
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	16,674
Gross Amount at Which Carried at Close of Period
Land	34,994
Building & Improvements	200,606
Total	235,600
Accumulated Depreciation	84,431
125 Park Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	120,900
Building & Improvements	270,598
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	30,032
Gross Amount at Which Carried at Close of Period
Land	120,900
Building & Improvements	300,630
Total	421,530
Accumulated Depreciation	139,949
19 East 65th Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	8,603
Building & Improvements	2,074
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	4,990
Gross Amount at Which Carried at Close of Period
Land	8,603
Building & Improvements	7,064
Total	15,667
Accumulated Depreciation	10
304 Park Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	54,489
Building & Improvements	90,643
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	12,056
Gross Amount at Which Carried at Close of Period
Land	54,489
Building & Improvements	102,699
Total	157,188
Accumulated Depreciation	36,859
752-760 Madison Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	284,286
Building & Improvements	8,314
Cost Capitalized Subsequent To Acquisition
Land	(2,748)
Building & Improvements	165,708
Gross Amount at Which Carried at Close of Period
Land	281,538
Building & Improvements	174,022
Total	455,560
Accumulated Depreciation	5,315
110 Greene Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	45,120
Building & Improvements	228,393
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	4,741
Gross Amount at Which Carried at Close of Period
Land	45,120
Building & Improvements	233,134
Total	278,254
Accumulated Depreciation	64,093
7 Dey / 185 Broadway
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	190,148
Initial Cost
Land	45,540
Building & Improvements	27,865
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	209,670
Gross Amount at Which Carried at Close of Period
Land	45,540
Building & Improvements	237,535
Total	283,075
Accumulated Depreciation	21,860
885 Third Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	138,444
Building & Improvements	244,040
Cost Capitalized Subsequent To Acquisition
Land	(138,444)
Building & Improvements	(119,024)
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements	125,016
Total	125,016
Accumulated Depreciation	15,506
690 Madison Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	13,820
Building & Improvements	51,732
Cost Capitalized Subsequent To Acquisition
Land	(7,985)
Building & Improvements	(27,336)
Gross Amount at Which Carried at Close of Period
Land	5,835
Building & Improvements	24,396
Total	30,231
Accumulated Depreciation	5,132
100 Park Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	360,000
Initial Cost
Land	230,891
Building & Improvements	133,269
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	230,891
Building & Improvements	133,269
Total	364,160
Accumulated Depreciation	0
10 East 53rd Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	205,000
Initial Cost
Land	104,143
Building & Improvements	62,470
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	104,143
Building & Improvements	62,470
Total	166,613
Accumulated Depreciation	4,710
Other
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	20,637
Building & Improvements	16,224
Cost Capitalized Subsequent To Acquisition
Land	(18,901)
Building & Improvements	(2,133)
Gross Amount at Which Carried at Close of Period
Land	1,736
Building & Improvements	14,091
Total	15,827
Accumulated Depreciation	$ 8,174

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation (Activity in Real Estate and Accumulated Depreciation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in real estate
Balance at beginning of year	$ 6,102,864	$ 9,198,799	$ 7,650,907
Property acquisitions	0	0	1,900,042
Improvements	199,416	241,213	335,413
Retirements/disposals/deconsolidation	305,461	(2,383,912)	(687,563)
Reclassification	0	(953,236)	0
Balance at end of year	6,607,741	6,102,864	9,198,799
Aggregate cost of land, buildings and improvements before depreciation	4,900,000
Changes in accumulated depreciation
Balance at beginning of year	1,968,004	2,039,554	1,896,199
Depreciation for year	171,744	199,576	175,465
Retirements/disposals/deconsolidation	(13,667)	(203,819)	(32,110)
Reclassification	0	(67,307)
Balance at end of year	$ 2,126,081	$ 1,968,004	$ 2,039,554