SL Green Realty (SLG) 10-K 18 Feb 22 2021 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 17, 2022	Jun. 30, 2021
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, 2021
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		64,770,730
Entity Public Float			$ 4.9
Entity Central Index Key	0001040971
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the SL Green Realty Corp.'s Proxy Statement for its 2022 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.
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	13-3960398
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		689,437
Entity Central Index Key	0001492869
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2021
Audit Information [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	New York, New York

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Commercial real estate properties, at cost:
Land and land interests		$ 1,350,701	$ 1,315,832
Building and improvements		3,671,402	4,168,193
Building leasehold and improvements		1,645,081	1,448,134
Right of use asset - financing leases		0	55,711
Right of use asset - operating leases		983,723	367,209
Total commercial real estate properties, at cost		7,650,907	7,355,079
Less: accumulated depreciation		(1,896,199)	(1,956,077)
Total commercial real estate properties, net		5,754,708	5,399,002
Assets held for sale		140,855	0
Cash and cash equivalents		251,417	266,059
Restricted cash		85,567	106,736
Investments in marketable securities		34,752	28,570
Tenant and other receivables		47,616	44,507
Related party receivables		29,408	34,657
Deferred rents receivable		248,313	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $5,057 and $11,232 and allowances of $6,630 and $13,213 in 2021 and 2020, respectively		1,088,723	1,076,542
Investments in unconsolidated joint ventures		2,997,934	3,823,322
Deferred costs, net		124,495	177,168
Other assets		262,841	448,213
Total assets	[1]	11,066,629	11,707,567
Liabilities
Mortgages and other loans payable, net		1,394,386	1,979,972
Revolving credit facility, net		381,334	105,262
Unsecured term loans, net		1,242,002	1,495,275
Unsecured notes, net		899,308	1,248,219
Accrued interest payable		12,698	14,825
Other liabilities		195,390	302,798
Accounts payable and accrued expenses		157,571	151,309
Deferred revenue		107,275	118,572
Lease liability - financing leases		102,914	152,521
Lease liability - operating leases		851,370	339,458
Dividend and distributions payable		187,372	149,294
Security deposits		52,309	53,836
Liabilities related to assets held for sale		64,120	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	5,748,049	6,211,341
Commitments and contingencies
Noncontrolling interests in Operating Partnership		344,252	358,262
Preferred units		196,075	202,169
Equity
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2021 and 2020		221,932	221,932
Common stock, $0.01 par value, 160,000 shares authorized and 65,132 and 67,470 issued and outstanding at December 31, 2021 and 2020, respectively (including 1,027 and 996 shares held in treasury at December 31, 2021 and 2020, respectively)		672	716
Additional paid-in-capital		3,739,409	3,862,949
Treasury stock at cost		(126,160)	(124,049)
Accumulated other comprehensive loss		(46,758)	(67,247)
Retained earnings		975,781	1,015,462
Total SL Green stockholders' equity		4,764,876	4,909,763
Noncontrolling interests in other partnerships		13,377	26,032
Total equity		4,778,253	4,935,795
Total liabilities and equity/capital		11,066,629	11,707,567
Service Corporation
Commercial real estate properties, at cost:
Land and land interests		193,400	41,200
Building and improvements		336,900	57,900
Building leasehold and improvements		0	2,000
Right of use asset - financing leases		15,400	37,800
Less: accumulated depreciation		(11,700)	(10,300)
Other assets		574,400	289,500
Liabilities
Mortgages and other loans payable, net		418,900	94,000
Accrued interest payable		800	700
Other liabilities		145,200	56,600
Lease liability - financing leases		$ 15,300	$ 29,900
[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: $193.4 million and $41.2 million of land, $336.9 million and $57.9 million of building and improvements, $— million and $2.0 million of building and leasehold improvements, $15.4 million and $37.8 million of right of use assets, $11.7 million and $10.3 million of accumulated depreciation, $574.4 million and $289.5 million of other assets included in other line items, $418.9 million and $94.0 million of real estate debt, net, $0.8 million and $0.7 million of accrued interest payable, $15.3 million and $29.9 million of lease liabilities, and $145.2 million and $56.6 million of other liabilities included in other line items as of December 31, 2021 and December 31, 2020, respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2012
Debt and preferred equity investments, net of discounts and deferred origination fees	$ 5,057	$ 11,232
Allowance for loan and lease losses	$ 6,630	$ 13,213	$ 1,750	$ 5,750
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)	65,132,000	67,470,000
Common stock, shares outstanding (in shares)	65,132,000	67,470,000
Treasury stock, shares (in shares)	1,027,000	996,000
Land	$ 1,350,701	$ 1,315,832
Building and improvements	3,671,402	4,168,193
Building leasehold and improvements	1,645,081	1,448,134
Right of use asset - financing leases	0	55,711
Accumulated depreciation	1,896,199	1,956,077
Other assets	262,841	448,213
Real estate debt	1,394,386	1,979,972
Accrued interest payable	12,698	14,825
Lease liabilities	102,914	152,521
Other liabilities	195,390	302,798
SL Green Operating Partnership
Debt and preferred equity investments, net of discounts and deferred origination fees	5,057	11,232
Allowance for loan and lease losses	$ 6,630	$ 13,213
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	3,782,000	3,939,000
SL Green partner's capital, general partner common units outstanding (shares)	677,000	703,000
SL Green partners' capital, limited partner common units outstanding (shares)	63,428,000	65,771,000
Land	$ 1,350,701	$ 1,315,832
Building and improvements	3,671,402	4,168,193
Building leasehold and improvements	1,645,081	1,448,134
Right of use asset - financing leases	0	55,711
Accumulated depreciation	1,896,199	1,956,077
Other assets	262,841	448,213
Real estate debt	1,394,386	1,979,972
Accrued interest payable	12,698	14,825
Lease liabilities	102,914	152,521
Other liabilities	$ 195,390	$ 302,798
Series I Preferred Stock
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			9,200,000
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 Balance Sheets_2

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Commercial real estate properties, at cost:
Land and land interests		$ 1,350,701	$ 1,315,832
Building and improvements		3,671,402	4,168,193
Building leasehold and improvements		1,645,081	1,448,134
Right of use asset - financing leases		0	55,711
Right of use asset - operating leases		983,723	367,209
Total commercial real estate properties, at cost		7,650,907	7,355,079
Less: accumulated depreciation		(1,896,199)	(1,956,077)
Total commercial real estate properties, net		5,754,708	5,399,002
Assets held for sale		140,855	0
Cash and cash equivalents		251,417	266,059
Restricted cash		85,567	106,736
Investments in marketable securities		34,752	28,570
Tenant and other receivables		47,616	44,507
Related party receivables		29,408	34,657
Deferred rents receivable		248,313	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $5,057 and $11,232 and allowances of $6,630 and $13,213 in 2021 and 2020, respectively		1,088,723	1,076,542
Investments in unconsolidated joint ventures		2,997,934	3,823,322
Deferred costs, net		124,495	177,168
Other assets		262,841	448,213
Total assets	[1]	11,066,629	11,707,567
Liabilities
Mortgages and other loans payable, net		1,394,386	1,979,972
Revolving credit facility, net		381,334	105,262
Unsecured term loans, net		1,242,002	1,495,275
Unsecured notes, net		899,308	1,248,219
Accrued interest payable		12,698	14,825
Other liabilities		195,390	302,798
Accounts payable and accrued expenses		157,571	151,309
Deferred revenue		107,275	118,572
Lease liability - financing leases		102,914	152,521
Lease liability - operating leases		851,370	339,458
Dividend and distributions payable		187,372	149,294
Security deposits		52,309	53,836
Liabilities related to assets held for sale		64,120	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[1]	5,748,049	6,211,341
Commitments and contingencies
Preferred units		196,075	202,169
SL Green stockholders equity:
Accumulated other comprehensive loss		(46,758)	(67,247)
Total liabilities and equity/capital		11,066,629	11,707,567
SL Green Operating Partnership
Commercial real estate properties, at cost:
Land and land interests		1,350,701	1,315,832
Building and improvements		3,671,402	4,168,193
Building leasehold and improvements		1,645,081	1,448,134
Right of use asset - financing leases		0	55,711
Right of use asset - operating leases		983,723	367,209
Total commercial real estate properties, at cost		7,650,907	7,355,079
Less: accumulated depreciation		(1,896,199)	(1,956,077)
Total commercial real estate properties, net		5,754,708	5,399,002
Assets held for sale		140,855	0
Cash and cash equivalents		251,417	266,059
Restricted cash		85,567	106,736
Investments in marketable securities		34,752	28,570
Tenant and other receivables		47,616	44,507
Related party receivables		29,408	34,657
Deferred rents receivable		248,313	302,791
Debt and preferred equity investments, net of discounts and deferred origination fees of $5,057 and $11,232 and allowances of $6,630 and $13,213 in 2021 and 2020, respectively		1,088,723	1,076,542
Investments in unconsolidated joint ventures			3,823,322
Deferred costs, net		124,495	177,168
Other assets		262,841	448,213
Total assets	[2]	11,066,629	11,707,567
Liabilities
Mortgages and other loans payable, net		1,394,386	1,979,972
Revolving credit facility, net		381,334	105,262
Unsecured term loans, net		1,242,002	1,495,275
Unsecured notes, net		899,308	1,248,219
Accrued interest payable		12,698	14,825
Other liabilities		195,390	302,798
Accounts payable and accrued expenses		157,571	151,309
Deferred revenue		107,275	118,572
Lease liability - financing leases		102,914	152,521
Lease liability - operating leases		851,370	339,458
Dividend and distributions payable		187,372	149,294
Security deposits		52,309	53,836
Liabilities related to assets held for sale		64,120	0
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities		100,000	100,000
Total liabilities	[2]	5,748,049	6,211,341
Commitments and contingencies
Limited partner interests in SLGOP (3,782 and 3,939 limited partner common units outstanding at December 31, 2021 and 2020, respectively)		344,252	358,262
Preferred units		196,075	202,169
SL Green stockholders equity:
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2021 and 2020		221,932	221,932
SL Green partners' capital (677 and 703 general partner common units, and 63,428 and 65,771 limited partner common units outstanding at December 31, 2021 and 2020, respectively)		4,589,702	4,755,078
Accumulated other comprehensive loss		(46,758)	(67,247)
Total SLGOP partners' capital		4,764,876	4,909,763
Noncontrolling interests in other partnerships		13,377	26,032
Total capital		4,778,253	4,935,795
Total liabilities and equity/capital		11,066,629	11,707,567
Service Corporation
Commercial real estate properties, at cost:
Land and land interests		193,400	41,200
Building and improvements		336,900	57,900
Building leasehold and improvements		0	2,000
Right of use asset - financing leases		15,400	37,800
Less: accumulated depreciation		(11,700)	(10,300)
Other assets		574,400	289,500
Liabilities
Mortgages and other loans payable, net		418,900	94,000
Accrued interest payable		800	700
Other liabilities		145,200	56,600
Lease liability - financing leases		$ 15,300	$ 29,900
[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: $193.4 million and $41.2 million of land, $336.9 million and $57.9 million of building and improvements, $— million and $2.0 million of building and leasehold improvements, $15.4 million and $37.8 million of right of use assets, $11.7 million and $10.3 million of accumulated depreciation, $574.4 million and $289.5 million of other assets included in other line items, $418.9 million and $94.0 million of real estate debt, net, $0.8 million and $0.7 million of accrued interest payable, $15.3 million and $29.9 million of lease liabilities, and $145.2 million and $56.6 million of other liabilities included in other line items as of December 31, 2021 and December 31, 2020, respectively.
[2]	(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: $193.4 million and $41.2 million of land, $336.9 million and $57.9 million of building and improvements, $— million and $2.0 million of building and leasehold improvements, $15.4 million and $37.8 million of right of use assets, $11.7 million and $10.3 million of accumulated depreciation, $574.4 million and $289.5 million of other assets included in other line items, $418.9 million and $94.0 million of real estate debt, net, $0.8 million and $0.7 million of accrued interest payable, $15.3 million and $29.9 million of lease liabilities, and $145.2 million and $56.6 million of other liabilities included in other line items as of December 31, 2021 and December 31, 2020, respectively.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2012
Debt and preferred equity investments, net of discounts and deferred origination fees	$ 5,057	$ 11,232
Allowance for loan and lease losses	$ 6,630	$ 13,213	$ 1,750	$ 5,750
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)	65,132,000	67,470,000
Common stock, shares outstanding (in shares)	65,132,000	67,470,000
Treasury stock, shares (in shares)	1,027,000	996,000
Land	$ 1,350,701	$ 1,315,832
Building and improvements	3,671,402	4,168,193
Building leasehold and improvements	1,645,081	1,448,134
Right of use asset - financing leases	0	55,711
Accumulated depreciation	1,896,199	1,956,077
Other assets	262,841	448,213
Real estate debt	1,394,386	1,979,972
Accrued interest payable	12,698	14,825
Lease liabilities	102,914	152,521
Other liabilities	195,390	302,798
SL Green Operating Partnership
Debt and preferred equity investments, net of discounts and deferred origination fees	5,057	11,232
Allowance for loan and lease losses	$ 6,630	$ 13,213
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	3,782,000	3,939,000
SL Green partner's capital, general partner common units outstanding (shares)	677,000	703,000
SL Green partners' capital, limited partner common units outstanding (shares)	63,428,000	65,771,000
Land	$ 1,350,701	$ 1,315,832
Building and improvements	3,671,402	4,168,193
Building leasehold and improvements	1,645,081	1,448,134
Right of use asset - financing leases	0	55,711
Accumulated depreciation	1,896,199	1,956,077
Other assets	262,841	448,213
Real estate debt	1,394,386	1,979,972
Accrued interest payable	12,698	14,825
Lease liabilities	102,914	152,521
Other liabilities	$ 195,390	$ 302,798
Series I Preferred Stock
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			9,200,000
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 Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Rental revenue, net	$ 678,176	$ 804,423	$ 983,557
Investment income	80,340	120,163	195,590
Other income	85,475	128,158	59,848
Total revenues	843,991	1,052,744	1,238,995
Expenses
Operating expenses, including related party expenses of $12,377 in 2021, $12,643 in 2020 and $18,106 in 2019	167,153	183,200	234,676
Real estate taxes	152,835	176,315	190,764
Operating lease rent	26,554	29,043	33,188
Interest expense, net of interest income	70,891	116,679	190,521
Amortization of deferred financing costs	11,424	11,794	11,653
Depreciation and amortization	216,869	313,668	272,358
Loan loss and other investment reserves, net of recoveries	2,931	35,298	0
Transaction related costs	3,773	503	729
Marketing, general and administrative	94,912	91,826	100,875
Total expenses	747,342	958,326	1,034,764
Equity in net loss from unconsolidated joint ventures	(55,402)	(25,195)	(34,518)
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate	(32,757)	2,961	76,181
Purchase price and other fair value adjustment	210,070	187,522	69,389
Gain on sale of real estate, net	287,417	215,506	(16,749)
Depreciable real estate reserves and impairments	(23,794)	(60,454)	(7,047)
Loss on early extinguishment of debt	(1,551)	0	0
Net income	480,632	414,758	291,487
Net income attributable to noncontrolling interests:
Noncontrolling interests in the Operating Partnership	(25,457)	(20,016)	(13,301)
Net loss (income) attributable to noncontrolling interests in other partnerships	1,884	(14,940)	3,159
Preferred unit distributions	(7,305)	(8,747)	(10,911)
Net income (loss) attributable to SL Green/SLGOP	449,754	371,055	270,434
Perpetual preferred stock dividends	(14,950)	(14,950)	(14,950)
Net income attributable to SL Green common stockholders	$ 434,804	$ 356,105	$ 255,484
Basic earnings per share (in dollars per share)	$ 6.57	$ 5.03	$ 3.29
Diluted earnings per share (in dollars per share)	$ 6.50	$ 5.01	$ 3.28
Basic weighted average common shares outstanding (in shares)	65,740	70,397	77,057
Diluted weighted average common shares and common share equivalents outstanding (in shares)	70,769	75,078	81,865

Consolidated Statements of Op_2

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating expenses, paid to related parties	$ 12,377	$ 12,643	$ 18,106
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 12,377	$ 12,643	$ 18,106

Consolidated Statements of Op_3

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Rental revenue, net	$ 678,176	$ 804,423	$ 983,557
Investment income	80,340	120,163	195,590
Other income	85,475	128,158	59,848
Total revenues	843,991	1,052,744	1,238,995
Expenses
Operating expenses, including related party expenses of $12,377 in 2021, $12,643 in 2020 and $18,106 in 2019	167,153	183,200	234,676
Real estate taxes	152,835	176,315	190,764
Operating lease rent	26,554	29,043	33,188
Interest expense, net of interest income	70,891	116,679	190,521
Amortization of deferred financing costs	11,424	11,794	11,653
Depreciation and amortization	216,869	313,668	272,358
Loan loss and other investment reserves, net of recoveries	2,931	35,298	0
Transaction related costs	3,773	503	729
Marketing, general and administrative	94,912	91,826	100,875
Total expenses	747,342	958,326	1,034,764
Equity in net loss from unconsolidated joint ventures	(55,402)	(25,195)	(34,518)
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate	(32,757)	2,961	76,181
Purchase price and other fair value adjustment	210,070	187,522	69,389
Gain on sale of real estate, net	287,417	215,506	(16,749)
Depreciable real estate reserves and impairments	(23,794)	(60,454)	(7,047)
Loss on early extinguishment of debt	(1,551)	0	0
Net income	480,632	414,758	291,487
Net income attributable to noncontrolling interests:
Net loss (income) attributable to noncontrolling interests in other partnerships	1,884	(14,940)	3,159
Preferred unit distributions	(7,305)	(8,747)	(10,911)
Net income (loss) attributable to SL Green/SLGOP	449,754	371,055	270,434
Perpetual preferred stock dividends	(14,950)	(14,950)	(14,950)
SL Green Operating Partnership
Revenues
Rental revenue, net	678,176	804,423	983,557
Investment income	80,340	120,163	195,590
Other income	85,475	128,158	59,848
Total revenues	843,991	1,052,744	1,238,995
Expenses
Operating expenses, including related party expenses of $12,377 in 2021, $12,643 in 2020 and $18,106 in 2019	167,153	183,200	234,676
Real estate taxes	152,835	176,315	190,764
Operating lease rent	26,554	29,043	33,188
Interest expense, net of interest income	70,891	116,679	190,521
Amortization of deferred financing costs	11,424	11,794	11,653
Depreciation and amortization	216,869	313,668	272,358
Loan loss and other investment reserves, net of recoveries	2,931	35,298	0
Transaction related costs	3,773	503	729
Marketing, general and administrative	94,912	91,826	100,875
Total expenses	747,342	958,326	1,034,764
Equity in net loss from unconsolidated joint ventures	(55,402)	(25,195)	(34,518)
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate	(32,757)	2,961	76,181
Purchase price and other fair value adjustment	210,070	187,522	69,389
Gain on sale of real estate, net	287,417	215,506	(16,749)
Depreciable real estate reserves and impairments	(23,794)	(60,454)	(7,047)
Loss on early extinguishment of debt	(1,551)	0	0
Net income	480,632	414,758	291,487
Net income attributable to noncontrolling interests:
Net loss (income) attributable to noncontrolling interests in other partnerships	1,884	(14,940)	3,159
Preferred unit distributions	(7,305)	(8,747)	(10,911)
Net income (loss) attributable to SL Green/SLGOP	475,211	391,071	283,735
Perpetual preferred stock dividends	(14,950)	(14,950)	(14,950)
Net income attributable to SLGOP common unitholders	$ 460,261	$ 376,121	$ 268,785
Basic earnings per unit (in dollars per share)	$ 6.57	$ 5.03	$ 3.29
Diluted earnings per unit (in dollars per share)	$ 6.50	$ 5.01	$ 3.28
Basic weighted average common units outstanding (in shares)	69,727	74,493	81,332
Diluted weighted average common units and common unit equivalents outstanding (in shares)	70,769	75,078	81,865

Consolidated Statements of Op_4

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating expenses, paid to related parties	$ 12,377	$ 12,643	$ 18,106
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 12,377	$ 12,643	$ 18,106

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 480,632	$ 414,758	$ 291,487
Other comprehensive loss:
Increase (decrease) in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	21,427	(39,743)	(47,118)
Increase (decrease) in unrealized value of marketable securities	104	(1,318)	1,249
Other comprehensive income (loss)	21,531	(41,061)	(45,869)
Comprehensive income	502,163	373,697	245,618
Net income attributable to noncontrolling interests and preferred units distributions	(30,878)	(43,703)	(21,053)
Other comprehensive (income) loss attributable to noncontrolling interests	(1,042)	2,299	2,276
Comprehensive income attributable to SL Green/SLGOP	$ 470,243	$ 332,293	$ 226,841

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 480,632	$ 414,758	$ 291,487
Other comprehensive loss:
Increase (decrease) in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	21,427	(39,743)	(47,118)
Increase (decrease) in unrealized value of marketable securities	104	(1,318)	1,249
Other comprehensive income (loss)	21,531	(41,061)	(45,869)
Comprehensive income	502,163	373,697	245,618
Net loss (income) attributable to noncontrolling interests	1,884	(14,940)	3,159
Other comprehensive (income) loss attributable to noncontrolling interests	(1,042)	2,299	2,276
Comprehensive income attributable to SL Green/SLGOP	470,243	332,293	226,841
SL Green Operating Partnership
Net income	480,632	414,758	291,487
Other comprehensive loss:
Increase (decrease) in unrealized value of derivative instruments, including SLGOP's share of joint venture derivative instruments	21,427	(39,743)	(47,118)
Increase (decrease) in unrealized value of marketable securities	104	(1,318)	1,249
Other comprehensive income (loss)	21,531	(41,061)	(45,869)
Comprehensive income	502,163	373,697	245,618
Net loss (income) attributable to noncontrolling interests	1,884	(14,940)	3,159
Other comprehensive (income) loss attributable to noncontrolling interests	(1,042)	2,299	2,276
Comprehensive income attributable to SL Green/SLGOP	$ 503,005	$ 361,056	$ 251,053

Consolidated Statement of Equit

Consolidated Statement of Equity - USD ($) shares in Thousands, $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common StockCumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid- In-Capital	Additional Paid- In-CapitalCumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury StockCumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained EarningsCumulative Effect, Period of Adoption, Adjusted Balance	Noncontrolling Interests	Noncontrolling InterestsCumulative Effect, Period of Adoption, Adjusted Balance	Series I Preferred StockPreferred Stock	Series I Preferred StockPreferred StockCumulative Effect, Period of Adoption, Adjusted Balance
Beginning Balance at Dec. 31, 2018		$ 5,947,855			$ 847		$ 4,508,685		$ (124,049)		$ 15,108		$ 1,278,998			$ 46,334		$ 221,932
Beginning Balance (in shares) at Dec. 31, 2018	[1]				78,897
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update		Accounting Standards Update 2016-13
Net income		$ 267,275											270,434			(3,159)
Acquisition of subsidiary interest from noncontrolling interest		(25,845)					(569)									(25,276)
Other comprehensive loss		(43,593)									(43,593)
Preferred dividends		(14,950)											(14,950)
DRSPP (in shares)	[1]				4
DRSPP proceeds		334					334
Conversion of units of the Operating Partnership to common stock (in shares)	[1]				5
Conversion of units in the Operating Partnership for common stock		471					471
Reallocation of noncontrolling interest in the operating partnership		(34,320)											(34,320)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	[1]				99
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings		25,763			$ 2		25,761
Repurchases of common stock (in shares)	[1]				(4,333)
Repurchases of common units		(384,399)			$ (46)		(248,287)						(136,066)
Contributions to consolidated joint venture interests		58,462														58,462
Cash distributions to noncontrolling interests		(478)														(478)
Cash distributions declared ( per common share, none of which represented a return of capital for federal income tax purposes)		(279,377)											(279,377)
Ending Balance at Dec. 31, 2019		5,517,198	$ (39,184)	$ 5,478,014	$ 803	$ 803	4,286,395	$ 4,286,395	(124,049)	$ (124,049)	(28,485)	$ (28,485)	1,084,719	$ (39,184)	$ 1,045,535	75,883	$ 75,883	221,932	$ 221,932
Ending Balance (in shares) at Dec. 31, 2019	[1]				74,672	74,672
Increase (Decrease) in Stockholders' Equity
Net income		385,995											371,055			14,940
Acquisition of subsidiary interest from noncontrolling interest		(1,536)					(3,123)									1,587
Other comprehensive loss		(38,762)									(38,762)
Preferred dividends		(14,950)											(14,950)
DRSPP (in shares)	[1]				16
DRSPP proceeds		1,006					1,006
Conversion of units of the Operating Partnership to common stock (in shares)	[1]				95
Conversion of units in the Operating Partnership for common stock		8,744			$ 1		8,743
Reallocation of noncontrolling interest in the operating partnership		32,598											32,598
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	[1]				(33)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings		25,271			$ 0		25,271
Repurchases of common stock (in shares)	[1]				(8,276)
Repurchases of common units		(532,262)			$ (88)		(455,343)						(76,831)
Contributions to consolidated joint venture interests		12,477														12,477
Cash distributions to noncontrolling interests		(78,855)														(78,855)
Cash distributions declared ( per common share, none of which represented a return of capital for federal income tax purposes)		(341,945)											(341,945)
Ending Balance at Dec. 31, 2020		4,935,795			$ 716		3,862,949		(124,049)		(67,247)		1,015,462			26,032		221,932
Ending Balance (in shares) at Dec. 31, 2020	[1]				66,474
Increase (Decrease) in Stockholders' Equity
Net income		447,870											449,754			(1,884)
Other comprehensive loss		20,489									20,489
Preferred dividends		(14,950)											(14,950)
DRSPP (in shares)	[1]				11
DRSPP proceeds		738					738
Reallocation of noncontrolling interest in the operating partnership		(9,851)											(9,851)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)	[1]				108
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings		32,583			$ 2		32,581
Repurchases of common stock (in shares)	[1]				(4,474)
Repurchases of common units		(337,624)			$ (46)		(281,206)						(56,372)
Proceeds from stock options exercised (in shares)	[1]				12
Proceeds from stock options exercised		818					818
Contributions to consolidated joint venture interests		336														336
Sale of interest in partially owned entity		(4,476)														(4,476)
Cash distributions to noncontrolling interests		(6,631)														(6,631)
Issuance of a special dividend paid primarily in stock (in shares)	[1]				1,974
Issuance of special dividend paid primarily in stock		123,529					123,529		(2,111)				2,111
Cash distributions declared ( per common share, none of which represented a return of capital for federal income tax purposes)		(410,373)											(410,373)
Ending Balance at Dec. 31, 2021		$ 4,778,253			$ 672		$ 3,739,409		$ (126,160)		$ (46,758)		$ 975,781			$ 13,377		$ 221,932
Ending Balance (in shares) at Dec. 31, 2021	[1]				64,105
[1]	On January 18, 2022, we completed a reverse stock split whereby every 1.03060 SL Green common share was combined into 1 SL Green common share. We have retroactively adjusted the outstanding share counts, share activity, cash distributions declared, and earnings per share, as if the reverse split occurred on December 31, 2018.

Consolidated Statement of Equ_2

Consolidated Statement of Equity (Parenthetical) - $ / shares	1 Months Ended			12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash distribution declared, per common share (in dollars per share)	$ 0.3203	$ 0.3217	$ 0.9387	$ 6.2729	$ 4.9374	$ 3.6434

Consolidated Statement of Capit

Consolidated Statement of Capital shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2021USD ($)shares	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)shares
Increase (Decrease) in Partner's Capital
Accounting Standards Update				Accounting Standards Update 2016-13
Acquisition of subsidiary interest from noncontrolling interest			$ (1,536)	$ (25,845)
DRSPP proceeds		$ 738	1,006	334
Conversion of common units			8,744	471
Reallocation of noncontrolling interest in the operating partnership		(9,851)	32,598	(34,320)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings		32,583	25,271	25,763
Repurchases of common units		(337,624)	(532,262)	(384,399)
Proceeds from stock options exercised		818
Sale of interest in partially owned entity		(4,476)
Cash distributions to noncontrolling interests		$ (6,631)	$ (78,855)	$ (478)
Common Stock
Increase (Decrease) in Partner's Capital
DRSPP proceeds (in units) | shares	[1]	11	16	4
DRSPP proceeds
Conversion of common units			$ 1
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in units) | shares	[1]	108	(33)	99
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings		$ 2	$ 0	$ 2
Repurchases of common units (in units) | shares	[1]	(4,474)	(8,276)	(4,333)
Repurchases of common units		$ (46)	$ (88)	$ (46)
Proceeds from stock options exercised (in shares) | shares	[1]	12
Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Acquisition of subsidiary interest from noncontrolling interest			1,587	(25,276)
Sale of interest in partially owned entity		$ (4,476)
Cash distributions to noncontrolling interests		(6,631)	(78,855)	(478)
SL Green Operating Partnership
Increase (Decrease) in Partner's Capital
Beginning Balance		4,935,795	5,517,198	5,947,855
Net income		447,870	385,995	267,275
Acquisition of subsidiary interest from noncontrolling interest			(1,536)	(25,845)
Other comprehensive income (loss)		20,489	(38,762)	(43,593)
Preferred distributions		(14,950)	(14,950)	(14,950)
DRSPP proceeds		738	1,006	334
Conversion of common units			8,744	471
Reallocation of noncontrolling interest in the operating partnership		(9,851)	32,598	(34,320)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings		32,583	25,271	25,763
Repurchases of common units		(337,624)	(532,262)	(384,399)
Proceeds from stock options exercised		818
Contributions to consolidated joint venture interests		336	12,477	58,462
Sale of interest in partially owned entity		(4,476)
Cash distributions to noncontrolling interests		(6,631)	(78,855)	(478)
Issuance of special distribution paid primarily in units		123,529
Cash distributions declared (none of which represented a return of capital for federal income tax purposes)		(410,373)	(341,945)	(279,377)
Ending Balance		4,778,253	4,935,795	5,517,198
SL Green Operating Partnership | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Partner's Capital
Beginning Balance			(39,184)
Ending Balance				(39,184)
SL Green Operating Partnership | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Partner's Capital
Beginning Balance			5,478,014
Ending Balance				5,478,014
SL Green Operating Partnership | Preferred Units | Series I Preferred Stock
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 | Preferred Units | Series I Preferred Stock | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Partner's Capital
Beginning Balance			221,932
Ending Balance				221,932
SL Green Operating Partnership | Common Stock | Partners' Interest
Increase (Decrease) in Partner's Capital
Beginning Balance		$ 4,755,078	$ 5,247,868	$ 5,664,481
Beginning Balance (units) | shares	[2]	66,474	74,672	78,897
Net income		$ 449,754	$ 371,055	$ 270,434
Acquisition of subsidiary interest from noncontrolling interest			(3,123)	(569)
Preferred distributions		$ (14,950)	$ (14,950)	$ (14,950)
DRSPP proceeds (in units) | shares	[2]	11	16	4
DRSPP proceeds		$ 738	$ 1,006	$ 334
Conversion of common units (in units) | shares	[2]		95	5
Conversion of common units			$ 8,744	$ 471
Reallocation of noncontrolling interest in the operating partnership		$ (9,851)	$ 32,598	$ (34,320)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in units) | shares	[2]	108	(33)	99
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings		$ 32,583	$ 25,271	$ 25,763
Repurchases of common units (in units) | shares	[2]	(4,474)	(8,276)	(4,333)
Repurchases of common units		$ (337,624)	$ (532,262)	$ (384,399)
Proceeds from stock options exercised (in shares) | shares	[2]	12
Proceeds from stock options exercised		$ 818
Issuance of special distribution paid primarily in units (in shares) | shares	[2]	1,974
Issuance of special distribution paid primarily in units		$ 123,529
Cash distributions declared (none of which represented a return of capital for federal income tax purposes)		(410,373)	(341,945)	(279,377)
Ending Balance		$ 4,589,702	$ 4,755,078	$ 5,247,868
Ending Balance (units) | shares	[2]	64,105	66,474	74,672
SL Green Operating Partnership | Common Stock | Partners' Interest | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Partner's Capital
Beginning Balance			$ (39,184)
Ending Balance				$ (39,184)
SL Green Operating Partnership | Common Stock | Partners' Interest | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Partner's Capital
Beginning Balance			$ 5,208,684
Beginning Balance (units) | shares	[2]		74,672
Ending Balance				$ 5,208,684
Ending Balance (units) | shares	[2]			74,672
SL Green Operating Partnership | Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Partner's Capital
Beginning Balance		$ (67,247)	$ (28,485)	$ 15,108
Other comprehensive income (loss)		20,489	(38,762)	(43,593)
Ending Balance		(46,758)	(67,247)	(28,485)
SL Green Operating Partnership | Accumulated Other Comprehensive Income (Loss) | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Partner's Capital
Beginning Balance			(28,485)
Ending Balance				(28,485)
SL Green Operating Partnership | Noncontrolling Interests
Increase (Decrease) in Partner's Capital
Beginning Balance		26,032	75,883	46,334
Net income		(1,884)	14,940	(3,159)
Acquisition of subsidiary interest from noncontrolling interest			1,587	(25,276)
Contributions to consolidated joint venture interests		336	12,477	58,462
Sale of interest in partially owned entity		(4,476)
Cash distributions to noncontrolling interests		(6,631)	(78,855)	(478)
Ending Balance		$ 13,377	26,032	75,883
SL Green Operating Partnership | Noncontrolling Interests | Cumulative Effect, Period of Adoption, Adjusted Balance
Increase (Decrease) in Partner's Capital
Beginning Balance			$ 75,883
Ending Balance				$ 75,883
[1]	On January 18, 2022, we completed a reverse stock split whereby every 1.03060 SL Green common share was combined into 1 SL Green common share. We have retroactively adjusted the outstanding share counts, share activity, cash distributions declared, and earnings per share, as if the reverse split occurred on December 31, 2018.
[2]	On January 18, 2022, we completed a reverse stock split whereby every 1.03060 SL Green Operating Partnership common unit was combined into 1 SL Green Operating Partnership common unit. We have retroactively adjusted the outstanding unit counts, unit activity, cash distributions declared, and earnings per units, as if the reverse split occurred on December 31, 2018

Consolidated Statement of Cap_2

Consolidated Statement of Capital (Parenthetical) - $ / shares	1 Months Ended			12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash distribution declared, per common share (in dollars per share)	$ 0.3203	$ 0.3217	$ 0.9387	$ 6.2729	$ 4.9374	$ 3.6434
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)				$ 6.2729	$ 4.9374	$ 3.6434

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Operating Activities
Net income	$ 480,632	$ 414,758	$ 291,487
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	228,293	325,462	284,011
Equity in net loss from unconsolidated joint ventures	55,402	25,195	34,518
Distributions of cumulative earnings from unconsolidated joint ventures	824	679	864
Equity in net loss (gain) on sale of interest in unconsolidated joint venture interest/real estate	32,757	(2,961)	(76,181)
Purchase price and other fair value adjustments	(210,070)	(187,522)	(69,389)
Depreciable real estate reserves and impairments	23,794	60,454	7,047
(Gain) loss on sale of real estate, net	(287,417)	(215,506)	16,749
Loan loss reserves and other investment reserves, net of recoveries	2,931	35,298	0
Loss on early extinguishment of debt	1,551	0	0
Deferred rents receivable	(6,701)	(7,582)	(13,941)
Non-cash lease expense	17,234	11,984	13,744
Other non-cash adjustments	37,164	15,178	271
Changes in operating assets and liabilities:
Tenant and other receivables	(20,561)	(17,074)	(4,968)
Related party receivables	(8,727)	1,451	7,802
Deferred lease costs	(10,117)	(20,900)	(70,938)
Other assets	20,345	(26,137)	(18,630)
Accounts payable, accrued expenses, other liabilities and security deposits	(66,387)	132,171	(25,597)
Deferred revenue	(1,727)	20,657	10,824
Change in lease liability - operating leases	(33,241)	(11,369)	(11,200)
Net cash provided by operating activities	255,979	554,236	376,473
Investing Activities
Acquisitions of real estate property	(152,791)	(86,846)	(262,591)
Additions to land, buildings and improvements	(302,486)	(458,140)	(252,986)
Acquisition deposits and deferred purchase price	0	0	(5,239)
Investments in unconsolidated joint ventures	(88,872)	(70,315)	(128,682)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	770,604	124,572	79,020
Net proceeds from disposition of real estate/joint venture interest	651,594	1,112,382	208,302
Cash assumed from consolidation of real estate investment	9,475	0	0
Proceeds from sale or redemption of marketable securities	4,528	0	0
Purchases of marketable securities	(10,000)	0	0
Other investments	40,200	32,479	(7,869)
Origination of debt and preferred equity investments	(95,695)	(360,953)	(607,844)
Repayments or redemption of debt and preferred equity investments	167,024	763,251	1,092,383
Net cash provided by investing activities	993,581	1,056,430	114,494
Financing Activities
Proceeds from mortgages and other loans payable	39,689	1,181,892	752,984
Repayments of mortgages and other loans payable	(375,044)	(1,186,828)	(230,076)
Proceeds from revolving credit facility and senior unsecured notes	1,488,000	1,495,000	1,310,000
Repayments of revolving credit facility and senior unsecured notes	(1,808,000)	(1,875,000)	(1,570,000)
Proceeds from stock options exercised and DRSPP issuance	1,556	1,006	334
Repurchase of common stock	(341,403)	(528,483)	(384,399)
Redemption of preferred stock	(6,040)	(82,750)	(18,142)
Redemption of OP units	(25,703)	(27,342)	(27,495)
Distributions to noncontrolling interests in other partnerships	(6,631)	(85,468)	(478)
Contributions from noncontrolling interests in other partnerships	336	12,477	10,239
Acquisition of subsidiary interest from noncontrolling interest	0	(1,536)	(25,845)
Distributions to noncontrolling interests in the Operating Partnership	(15,749)	(12,652)	(14,729)
Dividends/Distributions paid on common and preferred stock/units	(271,075)	(293,996)	(306,386)
Other obligation related to secured borrowing	51,862	0	0
Tax withholdings related to restricted share awards	(2,990)	(4,752)	(3,495)
Deferred loan costs	(13,745)	(70,036)	(21,162)
Principal payments of on financing lease liabilities	(434)	(833)	0
Net cash used in financing activities	(1,285,371)	(1,479,301)	(528,650)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(35,811)	131,365	(37,683)
Cash, cash equivalents, and restricted cash at beginning of year	372,795	241,430	279,113
Cash, cash equivalents, and restricted cash at end of period	336,984	372,795	241,430
Supplemental Cash Flow Information [Abstract]
Interest paid	152,773	201,348	248,684
Income taxes paid	4,405	2,296	1,489
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Conversion of units in the Operating Partnership	0	8,744	471
Redemption of units in the Operating Partnership for a joint venture sale	27,586	0	0
Exchange of preferred equity investment for real estate or equity in joint venture	0	119,497	0
Exchange of debt investment for real estate or equity in joint venture	9,468	122,796	34,498
Assumption of mortgage loan	60,000	0	0
Issuance of special dividend paid primarily in stock	121,418	0	0
Tenant improvements and capital expenditures payable	7,580	1,665	6,056
Fair value adjustment to noncontrolling interest in the Operating Partnership	9,851	32,598	34,320
Deconsolidation of a subsidiary	66,837	854,437	395
Deconsolidation of a subsidiary mortgage	510,000	5,593	0
Mortgages assumed in connection with sale of real estate	0	250,000	0
Seller financed purchases	0	100,000	0
Debt and preferred equity investments	8,372	9,014	0
Transfer of assets related to assets held for sale	140,855	0	391,664
Reversal of assets held for sale	0	391,664	0
Transfer of liabilities related to assets held for sale	64,120	0	0
Extinguishment of debt in connection with property dispositions	53,548	0	0
Consolidation of real estate investment	119,444	0	0
Removal of fully depreciated commercial real estate properties	19,831	66,169	19,577
Sale of interest in partially owned entity	4,476	0	0
Contribution to consolidated joint venture by noncontrolling interest	0	0	48,223
Distributions to noncontrolling interests	358	6,613	0
Share repurchase payable	0	3,779	0
Recognition of sales-type leases and related lease liabilities	0	119,725	0
Recognition of right of use assets and related lease liabilities	537,344	61,990	389,120
Cash and cash equivalents	251,417	266,059	166,070
Restricted cash	85,567	106,736	75,360
Total cash, cash equivalents, and restricted cash	336,984	372,795	241,430
Preferred Units
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of preferred units relating to a real estate acquisition	$ 0	$ 0	$ 1,000

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash distribution declared, per common share (in dollars per share)	$ 0.3203	$ 0.3217	$ 0.9387	$ 6.2729	$ 4.9374	$ 3.6434
Deconsolidation of a subsidiary				$ 66,837	$ 854,437	$ 395
Stock Distribution
Cash distribution declared, per common share (in dollars per share)	$ 2.5138	$ 1.7996
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)				$ 6.2729	$ 4.9374	$ 3.6434
Deconsolidation of a subsidiary				$ 66,837	$ 854,437	$ 395

Consolidated Statements of Ca_3

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Operating Activities
Net income	$ 480,632	$ 414,758	$ 291,487
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	228,293	325,462	284,011
Equity in net loss from unconsolidated joint ventures	55,402	25,195	34,518
Distributions of cumulative earnings from unconsolidated joint ventures	824	679	864
Equity in net loss (gain) on sale of interest in unconsolidated joint venture interest/real estate	32,757	(2,961)	(76,181)
Purchase price and other fair value adjustments	(210,070)	(187,522)	(69,389)
Depreciable real estate reserves and impairments	23,794	60,454	7,047
(Gain) loss on sale of real estate, net	(287,417)	(215,506)	16,749
Loan loss reserves and other investment reserves, net of recoveries	2,931	35,298	0
Loss on early extinguishment of debt	1,551	0	0
Deferred rents receivable	(6,701)	(7,582)	(13,941)
Non-cash lease expense	17,234	11,984	13,744
Other non-cash adjustments	37,164	15,178	271
Changes in operating assets and liabilities:
Tenant and other receivables	(20,561)	(17,074)	(4,968)
Related party receivables	(8,727)	1,451	7,802
Deferred lease costs	(10,117)	(20,900)	(70,938)
Other assets	20,345	(26,137)	(18,630)
Accounts payable, accrued expenses, other liabilities and security deposits	(66,387)	132,171	(25,597)
Deferred revenue	(1,727)	20,657	10,824
Change in lease liability - operating leases	(33,241)	(11,369)	(11,200)
Net cash provided by operating activities	255,979	554,236	376,473
Investing Activities
Acquisitions of real estate property	(152,791)	(86,846)	(262,591)
Additions to land, buildings and improvements	(302,486)	(458,140)	(252,986)
Acquisition deposits and deferred purchase price	0	0	(5,239)
Investments in unconsolidated joint ventures	(88,872)	(70,315)	(128,682)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	770,604	124,572	79,020
Net proceeds from disposition of real estate/joint venture interest	651,594	1,112,382	208,302
Cash assumed from consolidation of real estate investment	9,475	0	0
Proceeds from sale or redemption of marketable securities	4,528	0	0
Purchases of marketable securities	(10,000)	0	0
Other investments	40,200	32,479	(7,869)
Origination of debt and preferred equity investments	(95,695)	(360,953)	(607,844)
Repayments or redemption of debt and preferred equity investments	167,024	763,251	1,092,383
Net cash provided by investing activities	993,581	1,056,430	114,494
Financing Activities
Proceeds from mortgages and other loans payable	39,689	1,181,892	752,984
Repayments of mortgages and other loans payable	(375,044)	(1,186,828)	(230,076)
Proceeds from revolving credit facility and senior unsecured notes	1,488,000	1,495,000	1,310,000
Repayments of revolving credit facility and senior unsecured notes	(1,808,000)	(1,875,000)	(1,570,000)
Proceeds from stock options exercised and DRSPP issuance	1,556	1,006	334
Repurchase of common stock	(341,403)	(528,483)	(384,399)
Redemption of preferred stock	(6,040)	(82,750)	(18,142)
Redemption of OP units	(25,703)	(27,342)	(27,495)
Distributions to noncontrolling interests in other partnerships	(6,631)	(85,468)	(478)
Contributions from noncontrolling interests in other partnerships	336	12,477	10,239
Acquisition of subsidiary interest from noncontrolling interest	0	(1,536)	(25,845)
Dividends/Distributions paid on common and preferred stock/units	(271,075)	(293,996)	(306,386)
Other obligation related to secured borrowing	51,862	0	0
Tax withholdings related to restricted share awards	(2,990)	(4,752)	(3,495)
Deferred loan costs	(13,745)	(70,036)	(21,162)
Principal payments of on financing lease liabilities	(434)	(833)	0
Net cash used in financing activities	(1,285,371)	(1,479,301)	(528,650)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(35,811)	131,365	(37,683)
Cash, cash equivalents, and restricted cash at beginning of year	372,795	241,430	279,113
Cash, cash equivalents, and restricted cash at end of period	336,984	372,795	241,430
Supplemental Cash Flow Information [Abstract]
Interest paid	152,773	201,348	248,684
Income taxes paid	4,405	2,296	1,489
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Conversion of units in the Operating Partnership	0	8,744	471
Redemption of units in the Operating Partnership for a joint venture sale	27,586	0	0
Exchange of preferred equity investment for real estate or equity in joint venture	0	119,497	0
Exchange of debt investment for real estate or equity in joint venture	9,468	122,796	34,498
Assumption of mortgage loan	60,000	0	0
Tenant improvements and capital expenditures payable	7,580	1,665	6,056
Fair value adjustment to noncontrolling interest in the Operating Partnership	9,851	32,598	34,320
Deconsolidation of a subsidiary	66,837	854,437	395
Deconsolidation of a subsidiary mortgage	510,000	5,593	0
Mortgages assumed in connection with sale of real estate	0	250,000	0
Seller financed purchases	0	100,000	0
Debt and preferred equity investments	8,372	9,014	0
Transfer of assets related to assets held for sale	140,855	0	391,664
Reversal of assets held for sale	0	391,664	0
Transfer of liabilities related to assets held for sale	64,120	0	0
Extinguishment of debt in connection with property dispositions	53,548	0	0
Consolidation of real estate investment	119,444	0	0
Removal of fully depreciated commercial real estate properties	19,831	66,169	19,577
Sale of interest in partially owned entity	4,476	0	0
Contribution to consolidated joint venture by noncontrolling interest	0	0	48,223
Distributions to noncontrolling interests	358	6,613	0
Share repurchase payable	0	3,779	0
Recognition of sales-type leases and related lease liabilities	0	119,725	0
Recognition of right of use assets and related lease liabilities	537,344	61,990	389,120
Cash and cash equivalents	251,417	266,059	166,070
Restricted cash	85,567	106,736	75,360
Total cash, cash equivalents, and restricted cash	336,984	372,795	241,430
SL Green Operating Partnership
Operating Activities
Net income	480,632	414,758	291,487
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	228,293	325,462	284,011
Equity in net loss from unconsolidated joint ventures	55,402	25,195	34,518
Distributions of cumulative earnings from unconsolidated joint ventures	824	679	864
Equity in net loss (gain) on sale of interest in unconsolidated joint venture interest/real estate	32,757	(2,961)	(76,181)
Purchase price and other fair value adjustments	(210,070)	(187,522)	(69,389)
Depreciable real estate reserves and impairments	23,794	60,454	7,047
(Gain) loss on sale of real estate, net	(287,417)	(215,506)	16,749
Loan loss reserves and other investment reserves, net of recoveries	2,931	35,298	0
Loss on early extinguishment of debt	1,551	0	0
Deferred rents receivable	(6,701)	(7,582)	(13,941)
Non-cash lease expense	17,234	11,984	13,744
Other non-cash adjustments	37,164	15,178	271
Changes in operating assets and liabilities:
Tenant and other receivables	(20,561)	(17,074)	(4,968)
Related party receivables	(8,727)	1,451	7,802
Deferred lease costs	(10,117)	(20,900)	(70,938)
Other assets	20,345	(26,137)	(18,630)
Accounts payable, accrued expenses, other liabilities and security deposits	(66,387)	132,171	(25,597)
Deferred revenue	(1,727)	20,657	10,824
Change in lease liability - operating leases	(33,241)	(11,369)	(11,200)
Net cash provided by operating activities	255,979	554,236	376,473
Investing Activities
Acquisitions of real estate property	(152,791)	(86,846)	(262,591)
Additions to land, buildings and improvements	(302,486)	(458,140)	(252,986)
Acquisition deposits and deferred purchase price	0	0	(5,239)
Investments in unconsolidated joint ventures	(88,872)	(70,315)	(128,682)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	770,604	124,572	79,020
Net proceeds from disposition of real estate/joint venture interest	651,594	1,112,382	208,302
Cash assumed from consolidation of real estate investment	9,475	0	0
Proceeds from sale or redemption of marketable securities	4,528	0	0
Purchases of marketable securities	(10,000)	0	0
Other investments	40,200	32,479	(7,869)
Origination of debt and preferred equity investments	(95,695)	(360,953)	(607,844)
Repayments or redemption of debt and preferred equity investments	167,024	763,251	1,092,383
Net cash provided by investing activities	993,581	1,056,430	114,494
Financing Activities
Proceeds from mortgages and other loans payable	39,689	1,181,892	752,984
Repayments of mortgages and other loans payable	(375,044)	(1,186,828)	(230,076)
Proceeds from revolving credit facility and senior unsecured notes	1,488,000	1,495,000	1,310,000
Repayments of revolving credit facility and senior unsecured notes	(1,808,000)	(1,875,000)	(1,570,000)
Payment of debt extinguishment costs	0	0	0
Proceeds from stock options exercised and DRSPP issuance	1,556	1,006	334
Repurchase of common stock	(341,403)	(528,483)	(384,399)
Redemption of preferred stock	(6,040)	(82,750)	(18,142)
Redemption of OP units	(25,703)	(27,342)	(27,495)
Distributions to noncontrolling interests in other partnerships	(6,631)	(85,468)	(478)
Contributions from noncontrolling interests in other partnerships	336	12,477	10,239
Acquisition of subsidiary interest from noncontrolling interest	0	(1,536)	(25,845)
Dividends/Distributions paid on common and preferred stock/units	(286,824)	(306,648)	(321,115)
Other obligation related to secured borrowing	51,862	0	0
Tax withholdings related to restricted share awards	(2,990)	(4,752)	(3,495)
Deferred loan costs	(13,745)	(70,036)	(21,162)
Principal payments of on financing lease liabilities	(434)	(833)	0
Net cash used in financing activities	(1,285,371)	(1,479,301)	(528,650)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(35,811)	131,365	(37,683)
Cash, cash equivalents, and restricted cash at beginning of year	372,795	241,430	279,113
Cash, cash equivalents, and restricted cash at end of period	336,984	372,795	241,430
Supplemental Cash Flow Information [Abstract]
Interest paid	152,773	201,348	248,684
Income taxes paid	4,405	2,296	1,489
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Conversion of units in the Operating Partnership	0	8,744	471
Redemption of units in the Operating Partnership for a joint venture sale	27,586	0	0
Exchange of preferred equity investment for real estate or equity in joint venture	0	119,497	0
Exchange of debt investment for real estate or equity in joint venture	9,468	122,796	34,498
Assumption of mortgage loan	60,000	0	0
Issuance of common units relating to the real estate acquisition	121,418	0	0
Tenant improvements and capital expenditures payable	7,580	1,665	6,056
Fair value adjustment to noncontrolling interest in the Operating Partnership	9,851	32,598	34,320
Deconsolidation of a subsidiary	66,837	854,437	395
Deconsolidation of a subsidiary mortgage	510,000	5,593	0
Mortgages assumed in connection with sale of real estate	0	250,000	0
Seller financed purchases	0	100,000	0
Debt and preferred equity investments	8,372	9,014	0
Transfer of assets related to assets held for sale	140,855	0	391,664
Reversal of assets held for sale	0	391,664	0
Transfer of liabilities related to assets held for sale	64,120	0	0
Extinguishment of debt in connection with property dispositions	53,548	0	0
Consolidation of real estate investment	119,444	0	0
Removal of fully depreciated commercial real estate properties	19,831	66,169	19,577
Sale of interest in partially owned entity	4,476	0	0
Contribution to consolidated joint venture by noncontrolling interest	0	0	48,223
Distributions to noncontrolling interests	358	6,613	0
Share repurchase payable	0	3,779	0
Recognition of sales-type leases and related lease liabilities	0	119,725	0
Recognition of right of use assets and related lease liabilities	537,344	61,990	389,120
Cash and cash equivalents	251,417	266,059	166,070
Restricted cash	85,567	106,736	75,360
Total cash, cash equivalents, and restricted cash	336,984	372,795	241,430
Preferred Units
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of preferred units relating to a real estate acquisition	0	0	1,000
Preferred Units | SL Green Operating Partnership
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of preferred units relating to a real estate acquisition	$ 0	$ 0	$ 1,000

Consolidated Statements of Ca_4

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash distribution declared, per common share (in dollars per share)	$ 0.3203	$ 0.3217	$ 0.9387	$ 6.2729	$ 4.9374	$ 3.6434
Deconsolidation of a subsidiary				$ 66,837	$ 854,437	$ 395
Stock Distribution
Cash distribution declared, per common share (in dollars per share)	$ 2.5138	$ 1.7996
SL Green Operating Partnership
Cash distribution declared, per common share (in dollars per share)				$ 6.2729	$ 4.9374	$ 3.6434
Deconsolidation of a subsidiary				$ 66,837	$ 854,437	$ 395

Organization and Basis of Prese

Organization and Basis of Presentation	12 Months Ended
	Dec. 31, 2021
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, 2021, noncontrolling investors held, in the aggregate, a 5.57% limited partnership interest in the Operating Partnership, inclusive of retroactive adjustments to reflect the reverse stock split. 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, 2021, 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 Occupancy (1) (unaudited) Commercial: Manhattan Office 12 8,180,345 10 12,004,183 22 20,184,528 92.1 % Retail 2 17,888 9 301,996 11 319,884 91.2 % Development/Redevelopment (1) 8 2,538,284 3 3,275,508 11 5,813,792 N/A Fee Interest 1 7,684 — — 1 7,684 N/A 23 10,744,201 22 15,581,687 45 26,325,888 92.0 % Suburban Office 7 862,800 — — 7 862,800 78.9 % Total commercial properties 30 11,607,001 22 15,581,687 52 27,188,688 91.5 % Residential: Manhattan Residential 1 82,250 6 445,934 7 528,184 97.0 % Total portfolio 31 11,689,251 28 16,027,621 59 27,716,872 91.6 % (1) The weighted average occupancy for commercial properties represents the total occupied square footage divided by the total square footage at acquisition. The weighted average occupancy for residential properties represents the total occupied units divided by the total available units. Properties under construction are not included in the calculation of weighted average occupancy. As of December 31, 2021, we also managed two office buildings owned by third parties encompassing approximately 2.1 million square feet (unaudited), and held debt and preferred equity investments with a book value of $1.1 billion, excluding $10.1 million of debt and preferred equity investments and other financing receivables 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 On December 2, 2021, our Board of Directors declared an ordinary dividend of $0.3108 per share ($0.3203 per share reflecting reverse stock split noted below) and a special dividend of $2.4392 per share ($2.5138 per share reflecting reverse stock split noted below) (together, "the Total Dividend"). The Total Dividend was paid on January 18, 2022 to shareholders of record at the close of business on December 15, 2021 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 21, 2022. On January 10, 2022, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.03060-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed. All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Annual Report on Form 10-K.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
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 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 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. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). 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, 2021, the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 5.1 years, 14.3 years, and 3.8 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 the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. 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 lease term 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 $187.3 million, $277.5 million, and $233.5 million for the years ended December 31, 2021, 2020 and 2019, respectively. On a periodic basis, we assess whether there are any indications that the value of our real estate properties may be impaired or that their carrying value may not be recoverable. A property's value is considered impaired if management's estimate of the aggregate future cash flows (undiscounted) to be generated by the property is less than the carrying value of the property. 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 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. For the year ended December 31, 2021, we recognized a reduction of rental revenue of ($4.2 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, 2020 and 2019, we recognized $5.9 million and $4.5 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, 2021 and 2020 (in thousands): December 31, 2021 2020 Identified intangible assets (included in other assets): Gross amount $ 199,722 $ 215,673 Accumulated amortization (182,643) (190,523) Net (1) $ 17,079 $ 25,150 Identified intangible liabilities (included in deferred revenue): Gross amount $ 212,767 $ 241,409 Accumulated amortization (210,262) (230,479) Net (1) $ 2,505 $ 10,930 (1) As of December 31, 2021, $1.8 million of net intangible assets and no net intangible liabilities were reclassified to assets held for sale and liabilities related to assets held for sale. As of December 31, 2020, no net intangible assets and no net intangible liabilities were reclassified to assets held for sale and liabilities related to assets held for sale. 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): 2022 505 2023 476 2024 56 2025 234 2026 205 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): 2022 5,575 2023 5,409 2024 3,544 2025 2,027 2026 1,850 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, 2021, we did not have any debt securities designated as held-to-maturity or 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. Credit losses are recognized in accordance with ASC 326. We account for our 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, 2021 and 2020, we held the following marketable securities (in thousands): December 31, 2021 2020 Commercial mortgage-backed securities $ 24,146 $ 28,570 Total marketable securities available-for-sale $ 24,146 $ 28,570 Equity marketable securities $ 10,606 $ — Total investment in marketable securities $ 34,752 $ 28,570 The cost basis of the commercial mortgage-backed securities was $23.0 million and $27.5 million as of December 31, 2021 and 2020, respectively. These securities mature at various times through 2035. All securities were in an unrealized gain position as of December 31, 2021 except for one security, which had an unrealized loss of $0.6 million and a fair market value of $7.2 million as of December 31, 2021, and an unrealized loss of $0.7 million and a fair value of $7.0 million as of December 31, 2020. This marketable security was in in a continuous unrealized loss position for more than 12 months as of December 31, 2021 and less than 12 months as of December 31, 2020. We do not intend to sell these 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. We held equity marketable securities as of December 31, 2021 and no equity marketable securities as of December 31, 2020. We recognized $0.6 million of unrealized gains for the year ended December 31, 2021. During the year ended December 31, 2021, we received aggregate net proceeds of $4.5 million from the repayment of one debt marketable security. During the years ended 2020 and 2019, we did not dispose of any debt marketable securities. We did not dispose of any equity marketable securities during the year ended December 31, 2021. 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. Unless we are determined to be the primary beneficiary in a VIE, these participating rights 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. We do not believe that the values of any of our equity investments were impaired as of December 31, 2021. 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, 2021, 2020 and 2019, $6.2 million, $5.4 million, and $6.3 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. We recognize lease concessions related to COVID-19, such as rent deferrals and abatements, in accordance with the Lease Modification Q&A issued by the FASB in April 2020, which provides entities with the option to elect to account for lease concessions as though the enforceable rights and obligations existed in the original lease. This election is only available when total cash flows resulting from the modified lease are substantially similar to the cash flows in the original lease. When total cash flows resulting from the modified lease are not substantially similar to the cash flows in the original lease, we account for the concession agreement as a new lease. 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. 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 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 incurred in connection with our stock offerings are reflected as a reduction of additional paid-in-c

Property Acquisitions

Property Acquisitions	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Property Acquisitions	Property Acquisitions 2021 Acquisitions The following table summarizes the properties acquired during the year ended December 31, 2021: Property Acquisition Date Property Type Approximate Square Feet Gross Asset Valuation 885 Third Avenue (1) January 2021 Fee Interest 625,000 $ 387.9 461 Fifth Avenue (2) June 2021 Fee Interest 200,000 28.0 1591-1597 Broadway (3) September 2021 Fee Interest 7,684 121.0 690 Madison Avenue (4) September 2021 Fee Interest 7,848 72.2 (1) In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE in which we are 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. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures" and Note 16, "Fair Value Measurements. (2) In April 2021, the Company exercised its option to acquire the fee interest in the property from the ground lessor and the Company acquired the fee interest in June 2021. The Company held the leasehold interest in the property prior to exercising its option. (3) A third party has asserted ownership rights to the fee, which the Company is contesting. (4) In September 2021, the Company was the successful bidder for the fee interest in 690 Madison Avenue at the foreclosure of the asset. The property previously served as collateral for a debt and preferred equity investment. We recorded the assets acquired and liabilities assumed at fair value. See Note 5, "Debt and Preferred Equity Investments" and Note 16, "Fair Value Measurements." 2020 Acquisitions The following table summarizes the properties acquired during the year ended December 31, 2020: Property Acquisition Date Property Type Approximate Square Feet Gross Asset Valuation 762 Madison Avenue (1) January 2020 Fee Interest 6,109 $ 29.3 707 Eleventh Avenue January 2020 Fee Interest 159,720 90.0 15 Beekman (2) January 2020 Leasehold Interest 98,412 — 590 Fifth Avenue (3) October 2020 Fee Interest 103,300 107.2 (1) The Company acquired from our joint venture partner the remaining 10% interest in this property that the Company did not already own. (2) In January 2020, the Company entered into a 99-year ground lease of 126 Nassau Street and subsequently renamed the property 15 Beekman. In August 2020, we entered into a partnership as part of the capitalization of this development project. See note 6, “Investment in Unconsolidated Joint Ventures.” (3) The property previously served as collateral for a debt and preferred equity investment and was acquired through a negotiated transaction with the sponsor. 2019 Acquisitions The following table summarizes the properties acquired during the year ended December 31, 2019 : Property Acquisition Date Property Type Approximate Square Feet Acquisition Price 106 Spring Street (1) April 2019 Fee Interest 5,928 $ 80.2 410 Tenth Avenue (2) May 2019 Fee Interest 638,000 440.0 110 Greene Street (3) May 2019 Fee Interest 223,600 256.5 (1) In April 2019, the Company accepted an assignment of the equity interests in the property in lieu of repayment of the Company's debt investment and marked the assets received and liabilities assumed to fair value. (2) In May 2019, the Company closed on the acquisition of a majority and controlling 70.87% interest in 460 West 34th Street and subsequently renamed the property 410 Tenth Avenue. The Company had previously made a loan to the entity that was accounted for as an Acquisition, Development, and Construction (“ADC”) arrangement. Upon consolidating the entity in which it acquired the controlling equity interest, the Company and the Partnership removed the ADC arrangement and recorded the assets and liabilities of the entity at fair value, which resulted in the recognition of a fair value adjustment of $67.6 million, which was reflected in the Company's consolidated statement of operations within purchase price and other fair value adjustments, and $18.3 million of net intangible lease liabilities. (3) In May 2019, the Company acquired from our joint venture partner the remaining 10% interest in this property that the Company did not already own.

Properties Held for Sale and Pr

Properties Held for Sale and Property Dispositions	12 Months Ended
	Dec. 31, 2021
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, 2021, 1080 Amsterdam Avenue and 707 Eleventh Avenue were classified as held for sale as we entered into an agreement to sell the properties, both in Manhattan, for a total consideration of $42.5 million and $95.0 million, respectively. The sales of 1080 Amsterdam Avenue and 707 Eleventh Avenue are expected to close in the first quarter of 2022, both subject to customary closing conditions. The Company recorded a $15.0 million charge in connection with the classification of 707 Eleventh Avenue as held for sale, which is included in Depreciable real estate reserves and impairments in the consolidated statement of operations. Property Dispositions The following table summarizes the properties sold during the years ended December 31, 2021, 2020, and 2019: Property Disposition Date Property Type Unaudited Approximate Usable Square Feet Sales Price (1) (in millions) Gain (Loss) on Sale (2) (in millions) 110 East 42nd Street December 2021 Fee Interest 215,400 $ 117.1 $ 3.6 590 Fifth Avenue October 2021 Fee Interest 103,300 103.0 (3.2) 220 East 42nd Street (3) July 2021 Fee Interest 1,135,000 783.5 175.1 635-641 Sixth Avenue June 2021 Fee Interest 267,000 325.0 99.4 106 Spring Street (4) March 2021 Fee Interest 5,928 35.0 (2.8) 133 Greene Street (4) February 2021 Fee Interest 6,425 15.8 0.2 712 Madison Avenue (5) January 2021 Fee Interest 6,600 43.0 (1.4) 30 East 40th Street December 2020 Leasehold Interest 69,446 5.2 (1.6) 1055 Washington Boulevard December 2020 Leasehold Interest 182,000 23.8 (11.5) Williamsburg Terrace December 2020 Fee Interest 52,000 32.0 11.8 410 Tenth Avenue December 2020 Fee Interest 638,000 952.5 56.4 400 East 58th Street September 2020 Fee Interest 140,000 62.0 8.3 609 Fifth Avenue - Retail Condominium May 2020 Fee Interest 21,437 168.0 63.3 315 West 33rd Street - The Olivia March 2020 Fee Interest 492,987 446.5 71.8 Suburban Properties (6) December 2019 Fee Interest 1,107,000 229.2 1.8 1640 Flatbush Avenue December 2019 Fee Interest 1,000 16.2 5.5 562 Fifth Avenue December 2019 Fee Interest 42,635 52.4 (26.6) 1010 Washington Boulevard (7) November 2019 Fee Interest 143,400 23.1 (7.1) 115 Spring Street (8) August 2019 Fee Interest 5,218 66.6 3.6 (1) Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property. (2) The gain on sale is net of $13.7 million, $10.5 million, and $2.0 million of employee compensation accrued in connection with the realization of these investment gains in the years ended December 31, 2021, 2020, and 2019, respectively. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) In July 2021, the Company sold a 49% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million, which 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 Ventures." (4) In the first quarter of 2021, the property was foreclosed by the lender. (5) Disposition resulted from the buyer exercising its purchase option under a ground lease arrangement. (6) Suburban Properties consists of 360 Hamilton Avenue, 100 Summit Lake Drive, 200 Summit Lake Drive, and 500 Summit Lake Drive. (7) The Company recorded a $7.1 million charge in 2019 that is included in depreciable real estate reserves and impairments in the consolidated statement of operations. (8) The Company sold a 49% interest, which resulted in the deconsolidation of our remaining 51% interest. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $3.8 million, which 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 Ventures."

Debt and Preferred Equity Inves

Debt and Preferred Equity Investments	12 Months Ended
	Dec. 31, 2021
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, 2021 and 2020 (in thousands): December 31, 2021 December 31, 2020 Balance at beginning of year (1) $ 1,076,542 $ 1,580,306 Debt investment originations/fundings/accretion (2) 193,824 389,300 Preferred equity investment originations/accretion (2) 13,220 167,042 Redemptions/sales/syndications/equity ownership/amortization (3) (201,446) (1,048,643) Net change in loan loss reserves 6,583 (11,463) Balance at end of period (1) $ 1,088,723 $ 1,076,542 (1) Net of unamortized fees, discounts, and premiums. (2) Accretion includes amortization of fees and discounts and paid-in-kind investment income. (3) Certain participations in debt investments that were sold or syndicated, but did not meet the conditions for sale accounting, are included in Other assets and Other liabilities on the consolidated balance sheets. Below is a summary of our debt and preferred equity investments as of December 31, 2021 (dollars in thousands): Floating Rate Fixed Rate Total Carrying Value Senior Financing Maturity (1) Type Carrying Value Face Value Interest Rate Carrying Value Face Value Interest Rate Senior Mortgage Debt $ 22,646 $ 22,841 L + 3.50 - 3.50% $ 73,000 $ 73,000 3.00% $ 95,646 $ — 2022 - 2023 Mezzanine Debt 272,324 273,274 L + 5.00 - 12.57% 447,747 457,474 2.90 - 14.30% 720,071 4,664,200 2022 - 2029 Preferred Equity — — — 273,006 273,821 6.50 - 11.00% 273,006 1,962,750 2022 - 2027 Balance at end of period $ 294,970 $ 296,115 $ 793,753 $ 804,295 $ 1,088,723 $ 6,626,950 (1) Excludes available extension options to the extent they have not been exercised as of the date of this filing. The following table is a rollforward of our total allowance for loan losses for the years ended December 31, 2021, 2020 and 2019 (in thousands): December 31, 2021 2020 2019 Balance at beginning of year $ 13,213 $ 1,750 $ 5,750 Cumulative adjustment upon adoption of ASC 326 — 27,803 — Current period provision for loan loss — 20,693 — Write-offs charged against the allowance (1) (6,583) (37,033) (4,000) Balance at end of period (2) $ 6,630 $ 13,213 $ 1,750 (1) Includes $0.0 million and $19.0 million of charges recorded against investments that were sold during the year ended December 31, 2021 and 2020, respectively. These charges are included in loan loss and other investment reserves, net of recoveries, in our consolidated statements of operations. (2) As of December 31, 2021, all financing receivables on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $225.4 million. As of December 31, 2021, all debt and preferred equity investments were performing in accordance with their respective terms, with the exception of two investments with a carrying value, net of reserves, of $216.0 million and $6.8 million, as discussed in the Debt Investments and Preferred Equity Investments tables further below. As of December 31, 2020, all debt and preferred equity investments were performing in accordance with their respective terms, with the exception of one investment with a carrying value, net of reserves, of $6.8 million, as discussed in the Debt Investments table further below. No other financing receivables were 90 days past due as of December 31, 2021 and 2020 with the exception of a $27.7 million financing receivable included in Other assets, which was put on non-accrual in August 2018 as a result of an interest default. The following table sets forth the carrying value of our debt and preferred equity investment portfolio by risk rating as of December 31, 2021 and 2020 ($ in thousands): Risk Rating December 31, 2021 December 31, 2020 1 - Low Risk Assets - Low probability of loss $ 644,489 $ 695,035 2 - Watch List Assets - Higher potential for loss 437,344 365,167 3 - High Risk Assets - Loss more likely than not 6,890 16,340 $ 1,088,723 $ 1,076,542 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, 2021 (dollars in thousands): As of December 31, Risk Rating 2021 (1) 2020 (1) 2019 (1) Prior (1) Total 1 - Low Risk Assets - Low probability of loss $ 139,873 $ 151,086 $ 57,511 $ 296,019 $ 644,489 2 - Watch List Assets - Higher potential for loss — 133,735 260,242 43,367 437,344 3 - High Risk Assets - Loss more likely than not — — — 6,890 6,890 $ 139,873 $ 284,821 $ 317,753 $ 346,276 $ 1,088,723 (1) Year in which the investment was originated or acquired by us or in which a material modification occurred. We have determined that we have one portfolio segment of financing receivables as of December 31, 2021 and 2020 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 $50.3 million and $66.2 million as of December 31, 2021 and 2020, respectively. The Company recorded provisions for loan losses related to these financing receivables of $2.9 million and $14.6 million for the years ended December 31, 2021 and 2020, respectively. The Company recorded adjustments upon the adoption of ASC 326 of $11.4 million for the year ended December 31, 2020. All of these loans have a risk rating of 2 and were performing in accordance with their respective terms with the exception of a $27.7 million financing receivable, which was put on nonaccrual in August 2018, that has a risk rating of 3 and was fully reserved as of December 31, 2021. Debt Investments As of December 31, 2021 and 2020, we held the following debt investments with an aggregate weighted average current yield of 6.52%, as of December 31, 2021 (dollars in thousands): Loan Type December 31, 2021 December 31, 2021 December 31, 2021 Carrying Value (1) December 31, 2020 Carrying Value (1) Maturity Date (2) Fixed Rate Investments: Mezzanine Loan $ — $ 280,000 $ 43,521 $ 41,057 August 2022 Mortgage Loan — — 73,000 — April 2023 Mezzanine Loan (3) — 376,705 225,367 225,204 June 2023 Mezzanine Loan — 274,976 66,873 — June 2023 Mezzanine Loan (4a)(5) — 105,000 13,366 13,366 June 2024 Mezzanine Loan — 95,000 30,000 30,000 January 2025 Mezzanine Loan (6) — 1,712,750 55,250 55,250 June 2027 Mezzanine Loan — 85,000 20,000 20,000 December 2029 Junior Mortgage — — — 32,888 Mezzanine Loan — — — 3,500 Mortgage/Mezzanine Loan — — — 56,244 Total fixed rate $ — $ 2,929,431 $ 527,377 $ 477,509 Floating Rate Investments: Mezzanine Loan $ — $ 275,000 $ 49,998 $ 49,956 April 2022 Mezzanine Loan 4,933 180,415 37,511 35,318 July 2022 Mezzanine Loan (4b) — 1,115,000 133,735 127,915 March 2022 Mezzanine Loan 3,932 54,000 8,050 6,858 May 2022 Mortgage and Mezzanine Loan 23,360 — 34,874 14,011 December 2022 Mezzanine Loan 43,415 110,354 30,802 19,889 May 2023 Junior Mortgage Participation/Mezzanine Loan — — — 15,733 Mezzanine Loan — — — 29,106 Mortgage Loan — — — 53,674 Total floating rate $ 75,640 $ 1,734,769 $ 294,970 $ 352,460 Allowance for loan loss $ — $ — $ (6,630) $ (13,213) Total $ 75,640 $ 4,664,200 $ 815,717 $ 816,756 (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) This loan was put on non-accrual in July 2020 and remains on non-accrual as of December 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower. (4) Carrying value is net of the following amounts that were sold or syndicated, which are included in Other assets and Other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting: (a) $12.0 million, and (b) $0.4 million. (5) This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of December 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower. Additionally, we determined the borrower entity to be a VIE in which we are not the primary beneficiary. (6) The borrower under this mezzanine loan is an entity affiliated with HNA, which owns an equity interest in 245 Park Avenue. The borrower filed for bankruptcy protection on October 31, 2021, which the Company contested. Preferred Equity Investments As of December 31, 2021 and 2020, we held the following preferred equity investments with an aggregate weighted average current yield of 9.87% as of December 31, 2021 (dollars in thousands): Type December 31, 2021 December 31, 2021 December 31, 2021 (1) December 31, 2020 (1) Mandatory Redemption (2) Preferred Equity (3) $ — $ 1,712,750 $ 160,772 $ 154,691 June 2022 Preferred Equity — 250,000 112,234 105,095 February 2027 Total Preferred Equity $ — $ 1,962,750 $ 273,006 $ 259,786 Allowance for loan loss $ — $ — $ — $ — Total $ — $ 1,962,750 $ 273,006 $ 259,786 (1) Carrying value is net of deferred origination fees. (2) Represents contractual redemption, excluding any unexercised extension options. (3) 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. The Company contested the filing, on the basis that the filing was done in bad faith and in violation of HNA's agreements with the Company, and is currently appealing the Bankruptcy court’s ruling upholding the filing by HNA.

Investments in Unconsolidated J

Investments in Unconsolidated Joint Ventures	12 Months Ended
	Dec. 31, 2021
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 partners. As of December 31, 2021, the book value of these investments was $3.0 billion, net of investments with negative book values totaling $103.7 million for which we have an implicit commitment to fund future capital needs. As of December 31, 2021, 800 Third Avenue, 21 East 66th Street, and certain properties within the Stonehenge Portfolio are VIEs in which we are not the primary beneficiary. As of December 31, 2020, 800 Third Avenue, 21 East 66th Street, 605 West 42nd Street, and certain properties within the Stonehenge Portfolio are VIEs in which we were not the primary beneficiary. Our net equity investment in these VIEs was $85.6 million as of December 31, 2021 and $134.0 million as of December 31, 2020. 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 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, 2021: Property Partner Ownership Interest (1) Economic Interest (1) Unaudited Approximate Square Feet 100 Park Avenue Prudential Real Estate Investors 49.90% 49.90% 834,000 717 Fifth Avenue Wharton Properties/Private Investor 10.92% 10.92% 119,500 800 Third Avenue Private Investors 60.52% 60.52% 526,000 919 Third Avenue New York State Teacher's Retirement System 51.00% 51.00% 1,454,000 11 West 34th Street Private Investor/Wharton Properties 30.00% 30.00% 17,150 280 Park Avenue Vornado Realty Trust 50.00% 50.00% 1,219,158 1552-1560 Broadway (2) Wharton Properties 50.00% 50.00% 57,718 10 East 53rd Street Canadian Pension Plan Investment Board 55.00% 55.00% 354,300 21 East 66th Street (3) Private Investors 32.28% 32.28% 13,069 650 Fifth Avenue (4) Wharton Properties 50.00% 50.00% 69,214 121 Greene Street Wharton Properties 50.00% 50.00% 7,131 Stonehenge Portfolio (5) Various Various Various 1,439,016 11 Madison Avenue PGIM Real Estate 60.00% 60.00% 2,314,000 One Vanderbilt Avenue National Pension Service of Korea/Hines Interest LP 71.01% 71.01% 1,657,198 Worldwide Plaza (6) RXR Realty / New York REIT 24.95% 24.95% 2,048,725 1515 Broadway Allianz Real Estate of America 56.87% 56.87% 1,750,000 2 Herald Square Israeli Institutional Investor 51.00% 51.00% 369,000 115 Spring Street Private Investor 51.00% 51.00% 5,218 15 Beekman (7) A fund managed by Meritz Alternative Investment Management 20.00% 20.00% 221,884 85 Fifth Avenue Wells Fargo 36.27% 36.27% 12,946 One Madison Avenue (8) National Pension Service of Korea/Hines Interest LP/International Investor 25.50% 25.50% 1,048,700 220 East 42nd Street (9) A fund managed by Meritz Alternative Investment Management 51.00% 51.00% 1,135,000 (1) Ownership interest and economic interest represent the Company's interests in the joint venture as of December 31, 2021. Changes in ownership or economic interests within the current year are disclosed in the notes below. (2) 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. (3) We hold a 32.28% interest in three retail units and one residential unit at the property and a 16.14% interest in two residential units at the property. (4) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. (5) During the fourth quarter of 2021, the Company recorded a $3.1 million charge in connection with the pending sale of this investment for a gross consideration of approximately $1.0 million. This charge is included in Depreciable real estate reserves and impairments in the consolidated statement of operations. (6) In May 2021, the Company and RXR Realty jointly acquired a 1.2% interest in the property previously held by a private investor. This resulted in an increase in the Company's ownership interest of 0.6%. (7) In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company. (8) In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. The partners have committed aggregate equity to the project totaling no less than $492.2 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 49.5%. As of December 31, 2021, the total of the two partners' ownership interests based on equity contributed was 27.1%. In November 2021, the Company admitted an additional partner to the development project for a committed aggregate equity investment totaling no less than $259.3 million. The partner's indirect ownership interest in the joint venture is based on it's capital contributions, up to an aggregate maximum of 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, 2021. (9) In July 2021, the Company sold a 49% interest in the property, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million during the year ended December 31, 2021. The fair value of our investment was determined by the terms of the joint venture agreement. Disposition of Joint Venture Interests or Properties The following table summarizes the investments in unconsolidated joint ventures sold during the years ended December 31, 2021, 2020, and 2019: Property Ownership Interest Sold Disposition Date Gross Asset Valuation Gain (Loss) on Sale (in millions) (1) (2) 400 East 47th Street (3) 41.00% September 2021 $ 133.5 $ (1.0) 605 West 42nd Street - Sky 20.00% June 2021 858.1 8.9 55 West 46th Street - Tower 46 25.00% March 2021 275.0 (15.2) 885 Third Avenue (4) N/A January 2021 N/A N/A 333 East 22nd Street 33.33% December 2020 1.6 3.0 21 East 66th Street (5) 1 residential unit December 2019 2.9 0.3 521 Fifth Avenue 50.50% May 2019 381.0 57.9 131-137 Spring Street 20.00% January 2019 216.0 17.7 Stonehenge Portfolio (partial) Various Various - 2019 468.8 (2.4) (1) Represents the Company's share of the gain or loss (2) The gain on sale is net of $1.4 million, $0.0 million, and $4.0 million of employee compensation accrued in connection with the realization of these investment gains in the years ended December 31, 2021, 2020, and 2019, respectively. Additionally, gain (loss) amounts do not include adjustments for expenses recorded in subsequent periods. (3) In connection with our agreement to sell the property in April 2021, we recorded a charge of $5.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. (4) In January 2021, pursuant to the partnership documents, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions." (5) We, together with our joint venture partner, closed on the sale of one residential unit at the property. 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, 2021 and 2020, respectively, are as follows (dollars in thousands): Property Economic Interest (1) Current Maturity Date Final Maturity Date (2) Interest Rate (3) December 31, 2021 December 31, 2020 Fixed Rate Debt: 717 Fifth Avenue (mortgage) 10.92 % July 2022 July 2022 4.45% $ 300,000 $ 300,000 717 Fifth Avenue (mezzanine) 10.92 % July 2022 July 2022 5.50% 355,328 355,328 650 Fifth Avenue (mortgage) 50.00 % October 2022 October 2022 4.46% 210,000 210,000 650 Fifth Avenue (mezzanine) 50.00 % October 2022 October 2022 5.45% 65,000 65,000 21 East 66th Street 32.28 % April 2023 April 2028 3.60% 12,000 12,000 919 Third Avenue 51.00 % June 2023 June 2023 5.12% 500,000 500,000 1515 Broadway 56.87 % March 2025 March 2025 3.93% 801,845 820,607 11 Madison Avenue 60.00 % September 2025 September 2025 3.84% 1,400,000 1,400,000 800 Third Avenue 60.52 % February 2026 February 2026 3.37% 177,000 177,000 Worldwide Plaza 24.95 % November 2027 November 2027 3.98% 1,200,000 1,200,000 One Vanderbilt Avenue 71.01 % July 2031 July 2031 2.95% 3,000,000 — Stonehenge Portfolio (4) Various Various Various 3.50% 195,493 195,899 400 East 57th Street — 97,024 885 Third Avenue — 272,000 Total fixed rate debt $ 8,216,666 $ 5,604,858 Floating Rate Debt: 1552 Broadway 50.00 % October 2022 October 2022 L+ 2.65% $ 193,132 $ 195,000 280 Park Avenue 50.00 % September 2022 September 2024 L+ 1.73% 1,200,000 1,200,000 121 Greene Street 50.00 % November 2022 November 2022 L+ 2.00% 13,228 15,000 2 Herald Square 51.00 % November 2022 November 2023 L+ 1.95% 200,989 214,500 11 West 34th Street 30.00 % January 2023 January 2023 L+ 1.45% 23,000 23,000 220 East 42nd Street 51.00 % June 2023 June 2025 L+ 2.75% 510,000 — 115 Spring Street 51.00 % September 2023 September 2023 L+ 3.40% 65,550 65,550 100 Park Avenue 49.90 % December 2023 December 2025 L+ 2.25% 360,000 360,000 15 Beekman (5) 20.00 % January 2024 July 2025 L+ 1.50% 43,566 11,212 10 East 53rd Street 55.00 % February 2025 February 2025 L+ 1.35% 220,000 220,000 One Madison Avenue (6) 25.50 % November 2025 November 2026 L+ 3.35% 169,629 — 21 East 66th Street 32.28 % June 2033 June 2033 T+ 2.75% 632 677 One Vanderbilt Avenue — 1,210,329 605 West 42nd Street — 550,000 55 West 46th Street — 192,524 Total floating rate debt $ 2,999,726 $ 4,257,792 Total joint venture mortgages and other loans payable $ 11,216,392 $ 9,862,650 Deferred financing costs, net (130,516) (113,446) Total joint venture mortgages and other loans payable, net $ 11,085,876 $ 9,749,204 (1) Economic interest represents the Company's interests in the joint venture as of December 31, 2021. 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 options. The ability to exercise extension options may be subject to certain conditions, including meeting tests based on the operating performance of the property. (3) Interest rates as of December 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR ("L") or 1-year Treasury ("T"). (4) Comprised of three mortgages totaling $132.2 million that mature in April 2028 and two mortgages totaling $63.3 million that mature in July 2029. (5) This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred. (6) The loan is a $1.25 billion construction facility with an initial term of five years with one, one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics. We are entitled to receive fees for providing management, leasing, construction supervision and asset management services to certain of our joint ventures. We earned $19.6 million, $15.8 million and $13.0 million from these services, net of our ownership share of the joint ventures, for the years ended December 31, 2021, 2020, and 2019, 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, 2021 and 2020, are as follows (in thousands): December 31, 2021 December 31, 2020 Assets (1) Commercial real estate property, net $ 14,763,874 $ 16,143,880 Cash and restricted cash 768,510 357,076 Tenant and other receivables, related party receivables, and deferred rents receivable 533,455 403,883 Other assets 1,776,030 2,001,612 Total assets $ 17,841,869 $ 18,906,451 Liabilities and equity (1) Mortgages and other loans payable, net $ 11,085,876 $ 9,749,204 Deferred revenue/gain 1,158,242 1,341,571 Lease liabilities 980,595 1,002,563 Other liabilities 352,499 464,107 Equity 4,264,657 6,349,006 Total liabilities and equity $ 17,841,869 $ 18,906,451 Company's investments in unconsolidated joint ventures $ 2,997,934 $ 3,823,322 (1) As of December 31, 2021, $544.4 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, 2021, 2020, and 2019 are as follows (unaudited, in thousands): Year Ended December 31, 2021 2020 2019 Total revenues $ 1,228,364 $ 1,133,217 $ 1,163,534 Operating expenses 203,332 180,201 202,881 Real estate taxes 225,104 220,633 212,355 Operating lease rent 22,576 24,134 24,816 Interest expense, net of interest income 342,910 325,500 372,408 Amortization of deferred financing costs 31,423 20,427 19,336 Depreciation and amortization 484,130 407,834 407,697 Total expenses $ 1,309,475 $ 1,178,729 $ 1,239,493 Loss on early extinguishment of debt (2,017) (194) (1,031) Net loss before gain on sale $ (83,128) $ (45,706) $ (76,990) Company's equity in net loss from unconsolidated joint ventures $ (55,402) $ (25,195) $ (34,518)

Deferred Costs

Deferred Costs	12 Months Ended
	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs	Deferred Costs Deferred costs as of December 31, 2021 and 2020 consisted of the following (in thousands): December 31, 2021 2020 Deferred leasing costs $ 400,419 $ 447,002 Less: accumulated amortization (275,924) (269,834) Deferred costs, net $ 124,495 $ 177,168

Mortgages and Other Loans Payab

Mortgages and Other Loans Payable	12 Months Ended
	Dec. 31, 2021
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, 2021 and 2020, respectively, were as follows (dollars in thousands): Property Current Maturity Date Final Maturity Date (1) Interest Rate (2) December 31, 2021 December 31, 2020 Fixed Rate Debt: 100 Church Street July 2022 July 2022 4.68% $ 200,212 $ 204,875 420 Lexington Avenue October 2024 October 2040 3.99% 288,660 294,035 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 1080 Amsterdam (3) February 2027 February 2027 3.59% 34,537 34,773 Total fixed rate debt $ 1,073,409 $ 1,083,683 Floating Rate Debt: 609 Fifth Avenue March 2022 March 2025 L+ 2.95% $ 52,882 $ 57,651 7 Dey / 185 Broadway (4) November 2022 November 2023 L+ 2.85% 198,169 158,478 719 Seventh Avenue September 2023 September 2023 L+ 1.20% 50,000 50,000 690 Madison Avenue July 2024 July 2025 L+ 1.60% 60,000 — 220 East 42nd Street (5) — 510,000 133 Greene Street — 15,523 106 Spring Street — 38,025 FHLB Facility — 10,000 FHLB Facility — 15,000 FHLB Facility — 35,000 712 Madison Avenue — 28,000 2017 Master Repurchase Agreement (6) — — Total floating rate debt $ 361,051 $ 917,677 Total fixed rate and floating rate debt $ 1,434,460 $ 2,001,360 Mortgages reclassed to liabilities related to assets held for sale (34,537) — Total mortgages and other loans payable $ 1,399,923 $ 2,001,360 Deferred financing costs, net of amortization (5,537) (21,388) Total mortgages and other loans payable, net $ 1,394,386 $ 1,979,972 (1) Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property. (2) Interest rate as of December 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR, unless otherwise specified. (3) The loan is comprised of a $33.6 million mortgage loan and $0.9 million mezzanine loan with a fixed interest rate of 350 basis points and 700 basis points, respectively, for the first five years and is prepayable without penalty at the end of the fifth year. (4) This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions, and has an initial three year term with two one year extension options. In October 2021, an extension option was exercised, and the maturity date of this loan was extended by one year. Advances under the loan are subject to incurred costs and funded equity requirements. (5) In July 2021, the Company sold a 49% interest in the property. See Note 4, "Property Dispositions." (6) In June 2021, we exercised a one year extension option which extended the maturity date to June 2022. As of December 31, 2021, there was no outstanding balance on the $400.0 million facility. As of December 31, 2021 and 2020, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was approximately $2.1 billion and $2.5 billion, respectively. Federal Home Loan Bank of New York ("FHLB") Facility As of December 31, 2020, the Company’s wholly-owned subsidiary, Ticonderoga Insurance Company, or Ticonderoga, a Vermont licensed captive insurance company, was a member of the Federal Home Loan Bank of New York, or FHLBNY. As a member, Ticonderoga was able to borrow funds from the FHLBNY in the form of secured advances that bore interest at a floating rate. As a result of a Final Ruling from the Federal Housing Finance Authority, the regulator of the Federal Home Loan Bank system, all captive insurance company memberships were terminated as of February 2021. As such, all advances to Ticonderoga were repaid prior to such termination. Master Repurchase Agreement The Company entered into a Master Repurchase Agreement, or MRA, known as the 2017 MRA, which provides us with the ability to sell certain mortgage 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 agreement 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 debt 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 debt investments, our ability to satisfy margin calls with cash or cash equivalents and our access to additional liquidity. As of December 31, 2021, there have been no margin calls on the 2017 MRA. In April 2018, we increased the maximum facility capacity from $300.0 million to $400.0 million. The facility bears interest on a floating rate basis at a spread to 30-day LIBOR based on the pledged collateral and advance rate and is scheduled to mature in June 2022. As of December 31, 2021, the facility had no outstanding balance. 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, or the 2017 credit facility, and was originally entered into by the Company in November 2012, or the 2012 credit facility. As of December 31, 2021, 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. The revolving credit facility has two six As of December 31, 2021, 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, 2021, the applicable spread over adjusted Term SOFR plus 10 basis points was 85 basis points for the revolving credit facility, 95 basis points for Term Loan A, and 100 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, 2021, the facility fee was 20 basis points. As of December 31, 2021, we had $2.0 million of outstanding letters of credit, $390.0 million drawn under the revolving credit facility and $1.25 billion outstanding under the term loan facilities, with total undrawn capacity of $860.0 million under the 2021 credit facility. As of December 31, 2021 and December 31, 2020, the revolving credit facility had a carrying value of $381.3 million and $105.3 million, respectively, net of deferred financing costs. As of December 31, 2021 and December 31, 2020, the term loan facilities had a carrying value of $1.2 billion and $1.5 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, 2021 and 2020, respectively, by scheduled maturity date (dollars in thousands): Issuance December 31, December 31, December 31, Interest Rate (1) Initial Term Maturity Date October 5, 2017 (2) $ 500,000 $ 499,913 $ 499,803 3.25 % 5 October 2022 November 15, 2012 (3) 300,000 301,002 302,086 4.50 % 10 December 2022 December 17, 2015 (4) 100,000 100,000 100,000 4.27 % 10 December 2025 August 7, 2018 — — 350,000 — % 3 August 2021 $ 900,000 $ 900,915 $ 1,251,889 Deferred financing costs, net (1,607) (3,670) $ 900,000 $ 899,308 $ 1,248,219 (1) Interest rate as of December 31, 2021, taking into account interest rate hedges in effect during the period. (2) Issued by the Operating Partnership with the Company as the guarantor. (3) In October 2017, the Company and the Operating Partnership as co-obligors issued an additional $100.0 million of 4.50% senior unsecured notes due December 2022. The notes were priced at 105.334% of par. (4) Issued by the Company and the Operating Partnership as co-obligors. Restrictive Covenants The terms of the 2021 credit facility and certain of 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, 2021 and 2020, 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 125 basis points over the three-month LIBOR. 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, 2021, including as-of-right extension options, were as follows (in thousands): Scheduled Principal Revolving Unsecured Term Loans Trust Senior Total Joint 2022 $ 8,754 $ 448,835 $ — $ — $ — $ 800,000 $ 1,257,589 $ 426,057 2023 6,583 50,000 — — — — 56,583 750,696 2024 5,268 332,749 — 200,000 — — 538,017 616,510 2025 812 — — — — 100,000 100,812 1,391,185 2026 841 — 390,000 — — — 390,841 150,486 Thereafter 70 580,548 — 1,050,000 100,000 — 1,730,618 2,435,913 $ 22,328 $ 1,412,132 $ 390,000 $ 1,250,000 $ 100,000 $ 900,000 $ 4,074,460 $ 5,770,847 Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Year Ended December 31, 2021 2020 2019 Interest expense before capitalized interest $ 145,197 $ 185,934 $ 246,848 Interest on financing leases 5,448 8,091 3,243 Interest capitalized (78,365) (75,167) (55,446) Interest income (1,389) (2,179) (4,124) Interest expense, net $ 70,891 $ 116,679 $ 190,521

Corporate Indebtedness

Corporate Indebtedness	12 Months Ended
	Dec. 31, 2021
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, 2021 and 2020, respectively, were as follows (dollars in thousands): Property Current Maturity Date Final Maturity Date (1) Interest Rate (2) December 31, 2021 December 31, 2020 Fixed Rate Debt: 100 Church Street July 2022 July 2022 4.68% $ 200,212 $ 204,875 420 Lexington Avenue October 2024 October 2040 3.99% 288,660 294,035 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 1080 Amsterdam (3) February 2027 February 2027 3.59% 34,537 34,773 Total fixed rate debt $ 1,073,409 $ 1,083,683 Floating Rate Debt: 609 Fifth Avenue March 2022 March 2025 L+ 2.95% $ 52,882 $ 57,651 7 Dey / 185 Broadway (4) November 2022 November 2023 L+ 2.85% 198,169 158,478 719 Seventh Avenue September 2023 September 2023 L+ 1.20% 50,000 50,000 690 Madison Avenue July 2024 July 2025 L+ 1.60% 60,000 — 220 East 42nd Street (5) — 510,000 133 Greene Street — 15,523 106 Spring Street — 38,025 FHLB Facility — 10,000 FHLB Facility — 15,000 FHLB Facility — 35,000 712 Madison Avenue — 28,000 2017 Master Repurchase Agreement (6) — — Total floating rate debt $ 361,051 $ 917,677 Total fixed rate and floating rate debt $ 1,434,460 $ 2,001,360 Mortgages reclassed to liabilities related to assets held for sale (34,537) — Total mortgages and other loans payable $ 1,399,923 $ 2,001,360 Deferred financing costs, net of amortization (5,537) (21,388) Total mortgages and other loans payable, net $ 1,394,386 $ 1,979,972 (1) Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property. (2) Interest rate as of December 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR, unless otherwise specified. (3) The loan is comprised of a $33.6 million mortgage loan and $0.9 million mezzanine loan with a fixed interest rate of 350 basis points and 700 basis points, respectively, for the first five years and is prepayable without penalty at the end of the fifth year. (4) This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions, and has an initial three year term with two one year extension options. In October 2021, an extension option was exercised, and the maturity date of this loan was extended by one year. Advances under the loan are subject to incurred costs and funded equity requirements. (5) In July 2021, the Company sold a 49% interest in the property. See Note 4, "Property Dispositions." (6) In June 2021, we exercised a one year extension option which extended the maturity date to June 2022. As of December 31, 2021, there was no outstanding balance on the $400.0 million facility. As of December 31, 2021 and 2020, the gross book value of the properties and debt and preferred equity investments collateralizing the mortgages and other loans payable was approximately $2.1 billion and $2.5 billion, respectively. Federal Home Loan Bank of New York ("FHLB") Facility As of December 31, 2020, the Company’s wholly-owned subsidiary, Ticonderoga Insurance Company, or Ticonderoga, a Vermont licensed captive insurance company, was a member of the Federal Home Loan Bank of New York, or FHLBNY. As a member, Ticonderoga was able to borrow funds from the FHLBNY in the form of secured advances that bore interest at a floating rate. As a result of a Final Ruling from the Federal Housing Finance Authority, the regulator of the Federal Home Loan Bank system, all captive insurance company memberships were terminated as of February 2021. As such, all advances to Ticonderoga were repaid prior to such termination. Master Repurchase Agreement The Company entered into a Master Repurchase Agreement, or MRA, known as the 2017 MRA, which provides us with the ability to sell certain mortgage 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 agreement 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 debt 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 debt investments, our ability to satisfy margin calls with cash or cash equivalents and our access to additional liquidity. As of December 31, 2021, there have been no margin calls on the 2017 MRA. In April 2018, we increased the maximum facility capacity from $300.0 million to $400.0 million. The facility bears interest on a floating rate basis at a spread to 30-day LIBOR based on the pledged collateral and advance rate and is scheduled to mature in June 2022. As of December 31, 2021, the facility had no outstanding balance. 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, or the 2017 credit facility, and was originally entered into by the Company in November 2012, or the 2012 credit facility. As of December 31, 2021, 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. The revolving credit facility has two six As of December 31, 2021, 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, 2021, the applicable spread over adjusted Term SOFR plus 10 basis points was 85 basis points for the revolving credit facility, 95 basis points for Term Loan A, and 100 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, 2021, the facility fee was 20 basis points. As of December 31, 2021, we had $2.0 million of outstanding letters of credit, $390.0 million drawn under the revolving credit facility and $1.25 billion outstanding under the term loan facilities, with total undrawn capacity of $860.0 million under the 2021 credit facility. As of December 31, 2021 and December 31, 2020, the revolving credit facility had a carrying value of $381.3 million and $105.3 million, respectively, net of deferred financing costs. As of December 31, 2021 and December 31, 2020, the term loan facilities had a carrying value of $1.2 billion and $1.5 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, 2021 and 2020, respectively, by scheduled maturity date (dollars in thousands): Issuance December 31, December 31, December 31, Interest Rate (1) Initial Term Maturity Date October 5, 2017 (2) $ 500,000 $ 499,913 $ 499,803 3.25 % 5 October 2022 November 15, 2012 (3) 300,000 301,002 302,086 4.50 % 10 December 2022 December 17, 2015 (4) 100,000 100,000 100,000 4.27 % 10 December 2025 August 7, 2018 — — 350,000 — % 3 August 2021 $ 900,000 $ 900,915 $ 1,251,889 Deferred financing costs, net (1,607) (3,670) $ 900,000 $ 899,308 $ 1,248,219 (1) Interest rate as of December 31, 2021, taking into account interest rate hedges in effect during the period. (2) Issued by the Operating Partnership with the Company as the guarantor. (3) In October 2017, the Company and the Operating Partnership as co-obligors issued an additional $100.0 million of 4.50% senior unsecured notes due December 2022. The notes were priced at 105.334% of par. (4) Issued by the Company and the Operating Partnership as co-obligors. Restrictive Covenants The terms of the 2021 credit facility and certain of 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, 2021 and 2020, 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 125 basis points over the three-month LIBOR. 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, 2021, including as-of-right extension options, were as follows (in thousands): Scheduled Principal Revolving Unsecured Term Loans Trust Senior Total Joint 2022 $ 8,754 $ 448,835 $ — $ — $ — $ 800,000 $ 1,257,589 $ 426,057 2023 6,583 50,000 — — — — 56,583 750,696 2024 5,268 332,749 — 200,000 — — 538,017 616,510 2025 812 — — — — 100,000 100,812 1,391,185 2026 841 — 390,000 — — — 390,841 150,486 Thereafter 70 580,548 — 1,050,000 100,000 — 1,730,618 2,435,913 $ 22,328 $ 1,412,132 $ 390,000 $ 1,250,000 $ 100,000 $ 900,000 $ 4,074,460 $ 5,770,847 Consolidated interest expense, excluding capitalized interest, was comprised of the following (in thousands): Year Ended December 31, 2021 2020 2019 Interest expense before capitalized interest $ 145,197 $ 185,934 $ 246,848 Interest on financing leases 5,448 8,091 3,243 Interest capitalized (78,365) (75,167) (55,446) Interest income (1,389) (2,179) (4,124) Interest expense, net $ 70,891 $ 116,679 $ 190,521

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Cleaning/ Security/ Messenger and Restoration Services Alliance Building Services, or Alliance, and its affiliates, which provide services to certain properties owned by us, are partially owned by Gary Green, a son of Stephen L. Green, who serves as a member and as the chairman emeritus of our Board of Directors. Alliance’s affiliates include First Quality Maintenance, L.P., or First Quality, Classic Security LLC, Bright Star Couriers LLC and Onyx Restoration Works, and provide cleaning, extermination, security, messenger, and restoration services, respectively. In addition, First Quality has the non-exclusive opportunity to provide cleaning and related services to individual tenants at our properties on a basis separately negotiated with any tenant seeking such additional services. The Service Corporation has entered into an arrangement with Alliance whereby it will receive a profit participation above a certain threshold for services provided by Alliance to certain tenants at certain buildings above the base services specified in their lease agreements. Income earned from the profit participation, which is included in Other income on the consolidated statements of operations, was $1.7 million, $1.4 million and $3.9 million for the years ended December 31, 2021, 2020 and 2019, respectively. We also recorded expenses, inclusive of capitalized expenses, of $14.0 million, $13.3 million and $18.8 million for the years ended December 31, 2021, 2020 and 2019, respectively, for these services (excluding services provided directly to tenants). Management Fees S.L. Green Management Corp., a consolidated entity, receives property management fees from an entity in which Stephen L. Green owns an interest. We received management fees from this entity of $0.7 million, $0.6 million and $0.6 million for the years ended December 31, 2021, 2020, and 2019 respectively. One Vanderbilt Avenue Investment In December 2016, we entered into agreements with entities owned and controlled by our Chairman and CEO, Marc Holliday, and our President, Andrew Mathias, pursuant to which they agreed to make an investment in our One Vanderbilt project at the appraised fair market value for the interests acquired. This investment entitles these entities to receive approximately 1.50% - 1.80% and 1.00% - 1.20%, respectively, of any profits realized by the Company from its One Vanderbilt project in excess of the Company’s capital contributions. The entities have no right to any return of capital. Accordingly, subject to previously disclosed repurchase rights, these interests will have no value and will not entitle these entities to any amounts (other than limited distributions to cover tax liabilities incurred) unless and until the Company has received distributions from the One Vanderbilt project in excess of the Company’s aggregate investment in the project. In the event that the Company does not realize a profit on its investment in the project (or would not realize a profit based on the value at the time the interests are repurchased), the entities owned and controlled by Messrs. Holliday and Mathias will lose the entire amount of their investment. The entities owned and controlled by Messrs. Holliday and Mathias paid $1.4 million and $1.0 million, respectively, which equal 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 cannot monetize their interests until after stabilization of the property (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 7-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 monetization of the interests will equal the liquidation value of the interests at the time, with the value of One Vanderbilt being based on its sale price, if applicable, or fair market value as determined by an independent third party appraiser. As of December 31, 2021, stabilization of the property was achieved. 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 year ended December 31, 2021, we recorded $2.4 million of rent expense under the lease. Additionally, in June 2021, we entered into a lease agreement with the One Vanderbilt Avenue joint venture for SUMMIT One Vanderbilt, which commenced in October 2021. For the year ended December 31, 2021, we recorded $5.0 million of rent expense under the lease. See Note 20, “Commitments and Contingencies.” Other We are entitled to 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 and related parties as of December 31, 2021 and 2020 consisted of the following (in thousands): December 31, 2021 2020 Due from joint ventures $ 28,204 $ 27,006 Other 1,204 7,651 Related party receivables $ 29,408 $ 34,657

Noncontrolling Interests on the

Noncontrolling Interests on the Company's Consolidated Financial Statements	12 Months Ended
	Dec. 31, 2021
Noncontrolling Interest [Abstract]
Noncontrolling Interests on the Company's Consolidated Financial Statements	Noncontrolling Interests on the Company's Consolidated Financial StatementsNoncontrolling 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, 2021 and 2020, the noncontrolling interest unit holders owned 5.57%, or 3,781,565 units, and 5.59%, or 3,938,823 units, of the Operating Partnership, respectively, inclusive of retroactive adjustments to reflect the reverse stock split effectuated by SL Green in January 2022. As of December 31, 2021, 3,781,565 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 twelve months ended December 31, 2021 and 2020 (in thousands): December 31, 2021 2020 Balance at beginning of period $ 358,262 $ 409,862 Distributions (15,749) (12,652) Issuance of common units 18,678 12,018 Redemption and conversion of common units (53,289) (36,085) Net income 25,457 20,016 Accumulated other comprehensive loss allocation 1,042 (2,299) Fair value adjustment 9,851 (32,598) Balance at end of period $ 344,252 $ 358,262 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, 2021: 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) 3.50 % 109,161 109,161 109,161 $ 35.0000 $ 1,000.00 $ — August 2015 Series F 7.00 % 60 60 60 70.0000 1,000.00 29.12 January 2007 Series G (5) 4.50 % 1,902,000 1,902,000 718,697 1.1250 25.00 88.50 January 2012 Series K 3.50 % 700,000 563,954 341,677 0.8750 25.00 134.67 August 2014 Series L 4.00 % 500,000 378,634 372,634 1.0000 25.00 — August 2014 Series P 4.00 % 200,000 200,000 200,000 1.0000 25.00 — July 2015 Series Q 3.50 % 268,000 268,000 268,000 0.8750 25.00 148.95 July 2015 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 3.50 % 40,000 40,000 40,000 0.8750 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 unitholder 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 convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time, at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As of December 31, 2021, no Subsidiary Series B Preferred Units have been issued. (5) Common units of limited partnership interest in the Operating Partnership issued in a conversion may be redeemed in exchange for our common stock on a 1-to-1 basis. The Series G Preferred Units also provided the holder with the right to require the Operating Partnership to repurchase the Series G Preferred Units for cash before January 31, 2022, which the holder did not execute. (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 twelve months ended December 31, 2021 and 2020 (in thousands): December 31, 2021 2020 Balance at beginning of period $ 202,169 $ 283,285 Issuance of preferred units — — Redemption of preferred units (6,040) (82,750) Dividends paid on preferred units (6,760) (6,163) Accrued dividends on preferred units 6,706 7,797 Balance at end of period $ 196,075 $ 202,169

Stockholders' Equity of the Com

Stockholders' Equity of the Company	12 Months Ended
	Dec. 31, 2021
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, 2021, 64,105,276 shares of common stock and no shares of excess stock were issued and outstanding. On December 2, 2021 our Board of Directors declared an ordinary dividend of $0.3108 per share ($0.3203 per share reflecting reverse stock split noted below) and a special dividend of $2.4392 per share ($2.5138 per share reflecting reverse stock split noted below) (together, "the Total Dividend"). The Total Dividend was paid on January 18, 2022 to shareholders of record at the close of business on December 15, 2021 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 21, 2022. On January 10, 2022, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.03060-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed. All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Annual Report on Form 10-K. Share Repurchase Program In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion. As of December 31, 2021, share repurchases, excluding the redemption of OP Units, executed under the program were as follows: Period Shares repurchased Average price paid per share Cumulative number of shares repurchased as part of the repurchase plan or programs Year ended 2017 7,865,206 $107.81 7,865,206 Year ended 2018 9,187,480 $102.06 17,052,686 Year ended 2019 4,333,260 $88.69 21,385,946 Year ended 2020 8,285,460 $64.30 29,671,406 Year ended 2021 4,474,649 $75.44 34,146,055 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 2021, 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, 2021, 2020, and 2019, respectively (dollars in thousands): Year Ended December 31, 2021 2020 2019 Shares of common stock issued 10,387 16,181 3,645 Dividend reinvestments/stock purchases under the DRSPP $ 738 $ 1,006 $ 334 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, 2021, 2020, and 2019 are computed as follows (in thousands): Year Ended December 31, Numerator 2021 2020 2019 Basic Earnings: Income attributable to SL Green common stockholders $ 434,804 $ 356,105 $ 255,484 Less: distributed earnings allocated to participating securities (2,398) (1,685) (1,700) Less: undistributed earnings allocated to participating securities (192) (137) — Net income attributable to SL Green common stockholders (numerator for basic earnings per share) $ 432,214 $ 354,283 $ 253,784 Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 2,039 1,685 1,700 Add back: undistributed earnings allocated to participating securities 192 137 — Add back: Effect of dilutive securities (redemption of units to common shares) 25,457 20,016 13,301 Income attributable to SL Green common stockholders (numerator for diluted earnings per share) $ 459,902 $ 376,121 $ 268,785 Year Ended December 31, Denominator 2021 2020 2019 Basic Shares: Weighted average common stock outstanding 65,740 70,397 77,057 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares 3,987 4,096 4,275 Stock-based compensation plans 705 441 533 Contingently issuable shares 337 144 — Diluted weighted average common stock outstanding 70,769 75,078 81,865

Partners' Capital of the Operat

Partners' Capital of the Operating Partnership	12 Months Ended
	Dec. 31, 2021
Stockholders' Equity
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, 2021, 64,105,276 shares of common stock and no shares of excess stock were issued and outstanding. On December 2, 2021 our Board of Directors declared an ordinary dividend of $0.3108 per share ($0.3203 per share reflecting reverse stock split noted below) and a special dividend of $2.4392 per share ($2.5138 per share reflecting reverse stock split noted below) (together, "the Total Dividend"). The Total Dividend was paid on January 18, 2022 to shareholders of record at the close of business on December 15, 2021 ("the Record Date"). Shareholders had the opportunity to elect to receive the Total Dividend in the form of all cash or all stock, subject to proration if either option was oversubscribed. To mitigate the dilutive impact of the common stock issued in the special dividend, the board of directors also authorized a reverse stock split, which was effective after markets closed on January 21, 2022. On January 10, 2022, a committee of the Board of Directors calculated the ratio for the reverse stock split of our issued and outstanding shares of common stock as 1.03060-for-1. After the issuance of the dividend and the completion of the reverse stock split, the number of shares of our common stock outstanding was equivalent to the number of total shares outstanding on the Record Date (not including any issuances or repurchases that occurred following the Record Date, as well as any fractional shares that would have been issued but for which cash-in-lieu was paid). However, on a relative basis, some individual shareholders may have more shares of SLG’s common stock, and some individual shareholders may have fewer shares of our common stock, depending on their individual elections to receive cash or stock and as a result of the cash option being oversubscribed. All share-related references and measurements including the number of shares outstanding, share prices, number of shares repurchased, earnings per share, dividends per share, and share-based compensation awards, have been retroactively adjusted to reflect the reverse stock split for all periods presented in this Annual Report on Form 10-K. Share Repurchase Program In August 2016, our Board of Directors approved a $1.0 billion share repurchase program under which we can buy shares of our common stock. The Board of Directors has since authorized five separate $500.0 million increases to the size of the share repurchase program in the fourth quarter of 2017, second quarter of 2018, fourth quarter of 2018, fourth quarter of 2019, and fourth quarter of 2020 bringing the total program size to $3.5 billion. As of December 31, 2021, share repurchases, excluding the redemption of OP Units, executed under the program were as follows: Period Shares repurchased Average price paid per share Cumulative number of shares repurchased as part of the repurchase plan or programs Year ended 2017 7,865,206 $107.81 7,865,206 Year ended 2018 9,187,480 $102.06 17,052,686 Year ended 2019 4,333,260 $88.69 21,385,946 Year ended 2020 8,285,460 $64.30 29,671,406 Year ended 2021 4,474,649 $75.44 34,146,055 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 2021, 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, 2021, 2020, and 2019, respectively (dollars in thousands): Year Ended December 31, 2021 2020 2019 Shares of common stock issued 10,387 16,181 3,645 Dividend reinvestments/stock purchases under the DRSPP $ 738 $ 1,006 $ 334 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, 2021, 2020, and 2019 are computed as follows (in thousands): Year Ended December 31, Numerator 2021 2020 2019 Basic Earnings: Income attributable to SL Green common stockholders $ 434,804 $ 356,105 $ 255,484 Less: distributed earnings allocated to participating securities (2,398) (1,685) (1,700) Less: undistributed earnings allocated to participating securities (192) (137) — Net income attributable to SL Green common stockholders (numerator for basic earnings per share) $ 432,214 $ 354,283 $ 253,784 Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 2,039 1,685 1,700 Add back: undistributed earnings allocated to participating securities 192 137 — Add back: Effect of dilutive securities (redemption of units to common shares) 25,457 20,016 13,301 Income attributable to SL Green common stockholders (numerator for diluted earnings per share) $ 459,902 $ 376,121 $ 268,785 Year Ended December 31, Denominator 2021 2020 2019 Basic Shares: Weighted average common stock outstanding 65,740 70,397 77,057 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares 3,987 4,096 4,275 Stock-based compensation plans 705 441 533 Contingently issuable shares 337 144 — Diluted weighted average common stock outstanding 70,769 75,078 81,865
SL Green Operating Partnership
Stockholders' Equity
Partners' Capital of the Operating Partnership	Partners' Capital of the Operating Partnership The Company is the sole managing general partner of the Operating Partnership and as of December 31, 2021 owned 64,105,276 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. All unit-related references and measurements including the number of units outstanding and earnings per unit have been retroactively adjusted to reflect the reverse stock split effectuated by SL Green’s Board of Directors in January 2021 for all periods presented in this Annual Report on Form 10-K. Limited Partner Units As of December 31, 2021, limited partners other than SL Green owned 3,781,565 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, 2021, 2020, and 2019 respectively are computed as follows (in thousands): Year Ended December 31, Numerator 2021 2020 2019 Basic Earnings: Net income attributable to SLGOP common unitholders (numerator for diluted earnings per unit) $ 460,261 $ 376,121 $ 268,785 Less: distributed earnings allocated to participating securities (2,398) (1,685) (1,700) Less: undistributed earnings allocated to participating securities (192) (137) — Net Income attributable to SLGOP common unitholders (numerator for basic earnings per unit) $ 457,671 $ 374,299 $ 267,085 Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 2,590 1,822 1,700 Income attributable to SLGOP common unitholders $ 460,261 $ 376,121 $ 268,785 Year Ended December 31, Denominator 2021 2020 2019 Basic units: Weighted average common units outstanding 69,667 74,493 81,332 Effect of Dilutive Securities: Stock-based compensation plans 765 441 543 Contingently issuable units 337 144 (10) Diluted weighted average common units outstanding 70,769 75,078 81,865

Share-based Compensation

Share-based Compensation	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Share-based Compensation	Share-based CompensationWe 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 Fourth Amended and Restated 2005 Stock Option and Incentive Plan, or the 2005 Plan, was approved by the Company's Board of Directors in April 2016 and its stockholders in June 2016 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 27,030,000 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 3.74 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 0.73 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 fourth amendment and restatement in June 2016 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 27,030,000 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 2, 2026, 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, 2021, 2.0 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. 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. There were no options granted during the years ended December 31, 2021, 2020, and 2019. A summary of the status of the Company's stock options as of December 31, 2021, 2020, and 2019 and changes during the years ended December 31, 2021, 2020, and 2019 are as follows: 2021 2020 2019 Options Outstanding Weighted Average Options Outstanding Weighted Average Options Weighted Balance at beginning of year 761,686 $ 105.76 977,745 $ 108.57 1,071,977 $ 109.82 Exercised (11,314) 72.30 — — — — Lapsed or canceled (356,283) 112.56 (216,059) 118.49 (94,232) 122.84 Balance at end of year 394,089 $ 100.56 761,686 $ 105.76 977,745 $ 108.57 Options exercisable at end of year 394,089 $ 100.56 760,743 $ 105.76 862,593 $ 107.86 The remaining weighted average contractual life of the options outstanding was 2.3 years and the remaining weighted average contractual life of the options exercisable was 2.3 years. During the years ended December 31, 2021, 2020, and 2019, we recognized compensation expense for these options of $0.0 million, $0.0 million, and $2.5 million, respectively. As of December 31, 2021, there was no unrecognized compensation cost related to unvested stock options. Restricted Shares Shares are 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, 2021, 2020, and 2019 and changes during the years ended December 31, 2021, 2020, and 2019 are as follows: 2021 2020 2019 Balance at beginning of year 3,337,545 3,362,456 3,254,553 Granted 141,515 8,693 119,122 Canceled (19,697) (33,604) (11,219) Balance at end of year 3,459,363 3,337,545 3,362,456 Vested during the year 122,759 125,064 106,780 Compensation expense recorded $ 8,497,054 $ 10,895,459 $ 12,892,249 Total fair value of restricted stock granted during the year $ 9,214,531 $ 734,315 $ 11,131,181 The fair value of restricted stock that vested during the years ended December 31, 2021, 2020, and 2019 was $11.3 million, $12.5 million and $12.1 million, respectively. As of December 31, 2021, there was $6.9 million of total unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 1.8 years. We granted LTIP Units, which include bonus, time-based and performance-based awards, with a fair value of $55.0 million and $37.0 million during the years ended December 31, 2021 and 2020, 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, 2021, there was $46.6 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, 2021, 2020, and 2019, we recorded compensation expense related to bonus, time-based and performance-based awards of $41.9 million, $29.4 million, and $22.2 million, respectively. For the years ended December 31, 2021, 2020, and 2019, $2.1 million, $2.2 million, and $2.1 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, 2021, 24,426 phantom stock units and 12,312 shares of common stock were issued to our Board of Directors. We recorded compensation expense of $2.3 million during the year ended December 31, 2021 related to the Deferred Compensation Plan. As of December 31, 2021, there were 165,201 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, 2021, 172,421 shares of our common stock had been issued under the ESPP.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The following tables set forth the changes in accumulated other comprehensive (loss) income by component as of December 31, 2021, 2020 and 2019 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Net unrealized gain on marketable securities Total Balance at December 31, 2018 $ 9,716 $ 4,299 $ 1,093 $ 15,108 Other comprehensive (loss) income before reclassifications (32,723) (11,956) 1,184 (43,495) Amounts reclassified from accumulated other comprehensive loss 227 (325) — (98) Balance at December 31, 2019 (22,780) (7,982) 2,277 (28,485) Other comprehensive loss before reclassifications (48,532) (7,573) (1,256) (57,361) Amounts reclassified from accumulated other comprehensive loss 13,897 4,702 — 18,599 Balance at December 31, 2020 (57,415) (10,853) 1,021 (67,247) Other comprehensive income (loss) before reclassifications 14,908 (18,015) 96 (3,011) Amounts reclassified from accumulated other comprehensive loss 16,626 6,874 — 23,500 Balance at December 31, 2021 $ (25,881) $ (21,994) $ 1,117 $ (46,758) (1) Amount reclassified from accumulated other comprehensive loss is included in interest expense in the respective consolidated statements of operations. As of December 31, 2021 and 2020, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized gain (loss) on derivative instruments, was $(0.6) million and $(0.5) million, respectively. (2) Amount reclassified from accumulated other comprehensive loss 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, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value MeasurementsWe 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, 2021 and 2020 (in thousands): December 31, 2021 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 24,146 $ — $ 24,146 $ — Interest rate cap and swap agreements (included in Other assets) $ 1,896 $ — $ 1,896 $ — Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 29,912 $ — $ 29,912 $ — December 31, 2020 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 28,570 $ — $ 28,570 $ — Interest rate cap and swap agreements (included in Other assets) $ 28 $ — $ 28 $ — Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 61,217 $ — $ 61,217 $ — 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 September 2021, the Company was the successful bidder at the foreclosure of 690 Madison Avenue, at which time the company, at which time the Company's outstanding principal and accrued interest balance were credited to our equity investment in the property as it previously served as collateral for a debt and preferred equity investment. We recorded the assets acquired and liabilities assumed at fair value. 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 sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs. In July 2021, the Company sold a 49% interest in its 220 East 42nd Street investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million during the year ended December 31, 2021. The fair value of our investment was determined by the terms of the joint venture agreement. In January 2021, pursuant to the partnership documents of our 885 Third Ave investments, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE in which we are 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. 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 sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs. In December 2020, the Company determined there were indicators of impairment in two of its retail assets, 106 Spring Street and 133 Greene Street. The Company tested the recoverability of the assets and, as a result of the carrying amount of the assets being deemed not recoverable, recorded impairments of $39.7 million and $14.1 million, respectively. These charges are included in Depreciable real estate reserves and impairments in the consolidated statements of operations. The fair value of the assets were determined primarily using 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 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. 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 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, 2021 and December 31, 2020 (in thousands): December 31, 2021 December 31, 2020 Carrying Value (1) Fair Value Carrying Value (1) Fair Value Debt and preferred equity investments $ 1,088,723 (2) $ 1,076,542 (2) Fixed rate debt $ 3,274,324 $ 3,336,463 $ 3,135,572 $ 3,237,075 Variable rate debt 801,051 800,672 1,827,677 1,822,740 $ 4,075,375 $ 4,137,135 $ 4,963,249 $ 5,059,815 (1) Amounts exclude net deferred financing costs. (2) As of December 31, 2021, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion. As of December 31, 2020, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion. Disclosures regarding the fair value of financial instruments was based on pertinent information available to us as of December 31, 2021 and 2020. 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, 2021
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, such as interest rate swaps, caps, collars and floors, to manage, or hedge 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, 2021 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 $ 85,000 4.000 % March 2021 March 2022 Other Assets $ — Interest Rate Cap 111,869 3.500 % November 2021 November 2022 Other Assets 1 Interest Rate Swap 100,000 0.212 % January 2021 January 2023 Other Assets 376 Interest Rate Swap 400,000 0.184 % January 2022 February 2023 Other Assets 1,519 Interest Rate Swap 100,000 1.161 % November 2021 July 2023 Other Liabilities (733) Interest Rate Swap 200,000 1.131 % November 2021 July 2023 Other Liabilities (1,371) Interest Rate Swap 150,000 2.696 % December 2021 January 2024 Other Liabilities (5,625) Interest Rate Swap 150,000 2.721 % December 2021 January 2026 Other Liabilities (9,369) Interest Rate Swap 200,000 2.740 % December 2021 January 2026 Other Liabilities (12,814) $ (28,016) During the years ended December 31, 2021, 2020, and 2019, we recorded losses of $0.0 million, $0.1 million, and $0.1 million, respectively, on the changes in the fair value, which is included in interest expense in the consolidated statements of operations. The Company frequently has agreements with each of its derivative counterparties that 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, 2021, 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 $31.3 million. As of December 31, 2021, 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 $31.8 million as of December 31, 2021. Gains and losses on terminated hedges are included in accumulated other comprehensive income (loss), and are recognized into earnings over the term of the related mortgage obligation. Over time, the realized and unrealized gains and losses held in accumulated other comprehensive loss 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 $11.5 million of the current balance held in accumulated other comprehensive loss will be reclassified in interest expense and $3.8 million of the portion related to our share of joint venture accumulated other comprehensive loss will be reclassified into equity in net loss from unconsolidated joint ventures within the next 12 months. The following table presents the effect 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, 2021, 2020, and 2019, respectively (in thousands): Amount of Loss Location of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Income Amount of (Loss) Gain Year Ended Year Ended Derivative 2021 2020 2019 2021 2020 2019 Interest Rate Swaps/Caps $ 15,643 $ (51,244) $ (33,907) Interest expense $ (17,602) $ (14,569) $ (261) Share of unconsolidated joint ventures' derivative instruments (19,400) (7,977) (10,322) Equity in net (loss) income from unconsolidated joint ventures (7,582) (4,911) 256 $ (3,757) $ (59,221) $ (44,229) $ (25,184) $ (19,480) $ (5) The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of December 31, 2021 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 $ 220,000 4.000 % February 2020 February 2022 $ — Interest Rate Cap 1,075,000 2.850 % September 2021 September 2022 5 Interest Rate Cap 125,000 2.850 % September 2021 September 2022 1 Interest Rate Cap 23,000 4.750 % January 2021 January 2023 1 Interest Rate Cap 510,000 3.000 % December 2021 June 2023 155 Interest Rate Cap 1,250,000 1.250 % November 2020 October 2024 8,657 Interest Rate Swap 177,000 1.669 % March 2016 February 2026 (3,560) $ 5,259

Lease Income

Lease Income	12 Months Ended
	Dec. 31, 2021
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, 2021 are as follows (in thousands): 2022 $ 532,046 2023 485,299 2024 443,632 2025 415,241 2026 374,661 Thereafter 1,655,647 $ 3,906,526 The components of lease income from operating leases during the years ended December 31, 2021 and 2020 were as follows (in thousands): Twelve Months Ended December 31, 2021 2020 Fixed lease payments $ 600,474 $ 702,482 Variable lease payments 73,542 96,040 Total lease payments $ 674,016 $ 798,522 Amortization of acquired above and below-market leases 4,160 5,901 Total rental revenue $ 678,176 $ 804,423 (1) Amounts include $229.2 million and $237.9 million of sublease income for the years ended December 31, 2021 and 2020, respectively. The table below summarizes our investment in sales-type leases as of December 31, 2021: 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, 2021 are as follows (in thousands): Sales-type leases 2022 $ 3,087 2023 3,133 2024 3,180 2025 3,228 2026 3,276 Thereafter 203,494 Total minimum lease payments $ 219,398 Amount representing interest (116,376) Investment in sales-type leases (1) $ 103,022 (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, 2021 and 2020 were as follows (in thousands): Twelve Months Ended December 31, 2021 2020 Loss recognized at commencement, net (1) $ — $ (6,237) Interest income (2) 4,422 1,817 Total gain (loss) recognized on sales-type leases $ 4,422 $ (4,420) (1) These amounts are included in Gain on sale of real estate, net and Depreciable real estate reserves and impairments in our consolidated statements of operations. (2) These amounts are included in Other income in our consolidated statements of operations.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2021
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, 2019, September 27, 2020, and September 28, 2021, the actuary certified that for the plan years beginning July 1, 2019, July 1, 2020, and July 1, 2021, the Pension Plan was in critical 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, 2021. As of the date of this report, information was not yet available for the Pension Plan year ended June 30, 2021. For the Pension Plan years ended June 30, 2020 and 2019, the plan received contributions from employers totaling $291.3 million and $290.1 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. As of the date of this report, information was not yet available for the Health Plan year ended June 30, 2021. For the Health Plan years ended, June 30, 2020 and 2019, the plan received contributions from employers totaling $1.6 billion and $1.5 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, 2021, 2020 and 2019 are included in the table below (in thousands): Benefit Plan 2021 2020 2019 Pension Plan $ 1,994 $ 2,480 $ 3,103 Health Plan 6,333 7,688 9,949 Other plans 849 929 1,108 Total plan contributions $ 9,176 $ 11,097 $ 14,160 401(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 2021, 2020 and 2019, a matching contribution equal to 100% of the first 4% of annual compensation was made. For the years ended December 31, 2021, December 31, 2020, and December 31, 2019 we made matching contributions of $1.5 million, $1.7 million, and $1.6 million, respectively.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings As of December 31, 2021, 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. In September 2021, the Company acquired the fee position in 1591-1597 Broadway. A third party has asserted ownership rights to the fee, which the Company is contesting. See Note 3, "Property Acquisitions." 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. The Company contested the filing, on the basis that the filing was done in bad faith and in violation of HNA's agreements with the Company, and is currently appealing the Bankruptcy court’s ruling upholding the filing by HNA. See Note 5, "Debt and Preferred Equity Investments." 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 December 2023 and January 2025. The minimum cash-based compensation, including base salary and guaranteed bonus payments, associated with these employment agreements total $3.4 million for 2022. 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 three 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 $2.9 million and $2.9 million as of December 31, 2021 and 2020, respectively. Ticonderoga had no loss reserves as of December 31, 2021 and 2020. Lease Arrangements We are a tenant under leases for certain properties, including ground leases. These leases have expirations from 2022 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, 2021: Property (1) Year of Current Expiration Year of Final Expiration (2) 625 Madison Avenue 2022 2054 711 Third Avenue (3) 2033 2083 1185 Avenue of the Americas 2043 2043 SL Green Headquarters at One Vanderbilt (4) 2043 2048 420 Lexington Avenue 2050 2080 SUMMIT One Vanderbilt 2058 2070 885 Third Avenue 2080 2080 1080 Amsterdam Avenue (5) 2111 2111 15 Beekman (6)(7) 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. See note 10, "Related Party Transactions." (5) A portion of the lease is classified as a financing lease, which was classified as held for sale as of December 31, 2021. (6) 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. (7) 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, 2021 (in thousands): Financing leases Operating leases (1) 2022 $ 3,523 $ 36,776 2023 3,570 48,680 2024 3,641 54,545 2025 3,810 54,772 2026 3,858 54,911 Thereafter 256,691 1,395,533 Total minimum lease payments $ 275,093 $ 1,645,217 Amount representing interest (149,563) — Amount discounted using incremental borrowing rate — (786,280) Total lease liabilities excluding liabilities related to assets held for sale $ 125,530 $ 858,937 Leases reclassified to liabilities related to assets held for sale (22,616) (7,567) Total lease liabilities $ 102,914 $ 851,370 The following table provides lease cost information for the Company's operating leases for the twelve months ended December 31, 2021 and 2020 (in thousands): Twelve Months Ended December 31, Operating Lease Costs 2021 2020 Operating lease costs before capitalized operating lease costs $ 30,270 $ 32,169 Operating lease costs capitalized (3,716) (3,126) Operating lease costs, net (1) $ 26,554 $ 29,043 (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 twelve months ended December 31, 2021 and 2020 (in thousands): Twelve Months Ended December 31, Financing Lease Costs 2021 2020 Interest on financing leases before capitalized interest $ 5,448 $ 8,091 Interest on financing leases capitalized — (2,378) Interest on financing leases, net (1) 5,448 5,713 Amortization of right-of-use assets (2) 660 1,200 Financing lease costs, net $ 6,108 $ 6,913 (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, 2021, the weighted-average discount rate used to calculate the lease liabilities was 4.45%. As of December 31, 2021, the weighted-average remaining lease term was 32 years, inclusive of purchase options expected to be exercised.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2021
Segment Reporting [Abstract]
Segment Information	Segment Information The Company has two reportable segments, real estate and debt and preferred equity investments. We evaluate real estate performance and allocate resources based on earnings contributions. The primary sources of revenue are generated from tenant rents, escalations and reimbursement revenue. Real estate property operating expenses consist primarily of security, maintenance, utility costs, insurance, real estate taxes and ground rent expense (at certain applicable properties). See Note 5, "Debt and Preferred Equity Investments," for additional details on our debt and preferred equity investments. Selected consolidated results of operations for the years ended December 31, 2021, 2020, and 2019, and selected asset information as of December 31, 2021 and 2020, regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues Years ended: December 31, 2021 $ 763,651 $ 80,340 $ 843,991 December 31, 2020 932,581 120,163 1,052,744 December 31, 2019 1,043,405 195,590 1,238,995 Net Income Years ended: December 31, 2021 $ 412,393 $ 68,239 $ 480,632 December 31, 2020 354,353 60,405 414,758 December 31, 2019 158,972 132,515 291,487 Total assets As of: December 31, 2021 $ 9,974,140 $ 1,092,489 $ 11,066,629 December 31, 2020 10,579,899 1,127,668 11,707,567 Interest costs for the debt and preferred equity segment include actual costs incurred for borrowings on the 2017 MRA and the FHLB Facility. Interest is imputed on the investments that do not collateralize the 2017 MRA and the FHLB Facility using our weighted average corporate borrowing cost. We also allocate loan loss reserves, net of recoveries, and transaction related costs to the debt and preferred equity segment. We do not allocate marketing, general and administrative expenses to the debt and preferred equity segment because the use of personnel and resources is dependent on transaction volume between the two segments and varies between periods. In addition, we base performance on the individual segments prior to allocating marketing, general and administrative expenses. For the years ended, December 31, 2021, 2020, and 2019 marketing, general and administrative expenses totaled $94.9 million, $91.8 million, and $100.9 million respectively. All other expenses, except interest, relate entirely to the real estate assets. There were no transactions between the above two segments.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2021
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 $ 288,660 $ — $ 333,499 $ — $ 212,293 $ — $ 545,792 $ 545,792 $ 183,070 1927 3/1998 Various 711 Third Avenue — 19,844 115,769 — 69,839 19,844 185,608 205,452 71,105 1955 5/1998 Various 555 W. 57th Street — 18,846 140,946 — 2,376 18,846 143,322 162,168 86,730 1971 1/1999 Various 461 Fifth Avenue — — 88,276 28,873 6,421 28,873 94,697 123,570 38,024 1988 10/2003 Various 750 Third Avenue — 51,093 251,523 — 20,428 51,093 271,951 323,044 114,853 1958 7/2004 Various 625 Madison Avenue — — 291,319 — 62,282 — 353,601 353,601 145,749 1956 10/2004 Various 485 Lexington Avenue 450,000 78,282 452,631 — (14,169) 78,282 438,462 516,744 188,678 1956 12/2004 Various 609 Fifth Avenue (4) 52,882 16,869 107,185 — 62,554 16,869 169,739 186,608 19,879 1925 6/2006 Various 810 Seventh Avenue — 114,077 550,819 — 5,205 114,077 556,024 670,101 221,222 1970 1/2007 Various 1185 Avenue of the Americas — — 791,106 — 127,030 — 918,136 918,136 348,065 1969 1/2007 Various 1350 Avenue of the Americas — 90,941 431,517 — — 90,941 431,517 522,458 168,295 1966 1/2007 Various 1-6 Landmark Square (5) 100,000 27,852 161,343 (6,939) (33,873) 20,913 127,470 148,383 36,923 1973-1984 1/2007 Various 7 Landmark Square (5) — 1,721 8,417 (1,338) (6,240) 383 2,177 2,560 516 2007 1/2007 Various 100 Church Street 200,212 34,994 183,932 — 6,326 34,994 190,258 225,252 65,736 1959 1/2010 Various 125 Park Avenue — 120,900 270,598 — 15,899 120,900 286,497 407,397 109,858 1923 10/2010 Various 19 East 65th Street — 8,603 2,074 — — 8,603 2,074 10,677 — 1929 01/2012 Various 304 Park Avenue — 54,489 90,643 — 5,139 54,489 95,782 150,271 26,627 1930 6/2012 Various 760 Madison Avenue (6) — 284,286 8,314 (2,450) 63,077 281,836 71,391 353,227 4,991 1996/2012 7/2014 Various 719 Seventh Avenue (7) 50,000 41,180 46,232 — (4,725) 41,180 41,507 82,687 3,356 1927 7/2014 Various 110 Greene Street — 45,120 228,393 — 2,578 45,120 230,971 276,091 42,909 1910 7/2015 Various 7 Dey / 185 Broadway (8) 198,169 45,540 27,865 — 177,184 45,540 205,049 250,589 419 1921 8/2015 Various 885 Third Avenue — 138,444 244,040 — 15,396 138,445 259,438 397,883 7,885 1986 07/2020 Various 690 Madison 60,000 13,820 51,732 — — 13,820 51,732 65,552 409 1879 09/2021 Various 1591-1597 Broadway (9) — 123,919 — — — 123,919 — 123,919 — 1987 09/2021 Various Other (10) — 1,734 16,224 — 610,787 1,734 627,011 628,745 10,900 Total $ 1,399,923 $ 1,332,556 $ 4,894,397 $ 18,146 $ 1,405,807 $ 1,350,701 $ 6,300,206 $ 7,650,907 $ 1,896,199 (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) Includes right of use lease assets. (4) In 2020, we sold the retail condominium at this property. The amounts presented here relate to the office condominium, which we retained. (5) Property located in Connecticut. (6) Includes amounts attributable to the property at 762 Madison Avenue, which is part of this development project. (7) We own a 75.0% interest in this property. (8) Properties at 5-7 Dey Street, 183 Broadway, and 185 Broadway were demolished in preparation of the development site for the 7 Dey / 185 Broadway project. (9) A third party has asserted ownership rights to the fee, which the Company is contesting. (10) Other includes tenant improvements of eEmerge, capitalized interest and corporate improvements. The changes in real estate for the years ended December 31, 2021, 2020 and 2019 are as follows (in thousands): 2021 2020 2019 Balance at beginning of year $ 7,355,079 $ 8,784,567 $ 8,513,935 Property acquisitions 124,103 178,635 — Improvements 296,876 481,327 251,674 Retirements/disposals/deconsolidation (125,151) (2,089,450) 18,958 Balance at end of year $ 7,650,907 $ 7,355,079 $ 8,784,567 The aggregate cost of land, buildings and improvements, before depreciation, for Federal income tax purposes as of December 31, 2021 was $8.8 billion (unaudited). The changes in accumulated depreciation, exclusive of amounts relating to equipment, autos, and furniture and fixtures, for the years ended December 31, 2021, 2020 and 2019 are as follows (in thousands): 2021 2020 2019 Balance at beginning of year $ 1,956,077 $ 2,060,560 $ 2,099,137 Depreciation for year 174,219 270,843 222,867 Retirements/disposals/deconsolidation (234,097) (375,326) (261,444) Balance at end of year $ 1,896,199 $ 1,956,077 $ 2,060,560

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
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 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 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
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. The tenant improvements and origination costs are amortized as an expense over the remaining life of the lease (or charged against earnings if the lease is terminated prior to its contractual expiration date). 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, 2021, the weighted average amortization period for above-market leases, below-market leases, and in-place lease costs is 5.1 years, 14.3 years, and 3.8 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 the lease transfers ownership of the asset at the end of the lease term, the lease grants an option to purchase the asset that we are reasonably certain to exercise, the lease term is for a major part of the remaining economic life of the asset, or the present value of the lease payments exceeds substantially all of the fair value of the asset. 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
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.
Fair Value Measurements	Fair Value MeasurementsWe 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 September 2021, the Company was the successful bidder at the foreclosure of 690 Madison Avenue, at which time the company, at which time the Company's outstanding principal and accrued interest balance were credited to our equity investment in the property as it previously served as collateral for a debt and preferred equity investment. We recorded the assets acquired and liabilities assumed at fair value. 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 sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs. In July 2021, the Company sold a 49% interest in its 220 East 42nd Street investment, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million during the year ended December 31, 2021. The fair value of our investment was determined by the terms of the joint venture agreement. In January 2021, pursuant to the partnership documents of our 885 Third Ave investments, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE in which we are 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. 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 sales comparison approach, which utilizes comparable sales, listings and sales contracts. All of which are classified as Level 3 inputs. In December 2020, the Company determined there were indicators of impairment in two of its retail assets, 106 Spring Street and 133 Greene Street. The Company tested the recoverability of the assets and, as a result of the carrying amount of the assets being deemed not recoverable, recorded impairments of $39.7 million and $14.1 million, respectively. These charges are included in Depreciable real estate reserves and impairments in the consolidated statements of operations. The fair value of the assets were determined primarily using 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 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. 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 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.
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, 2021, we did not have any debt securities designated as held-to-maturity or 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. Credit losses are recognized in accordance with ASC 326. We account for our equity marketable securities at fair value pursuant to ASC 820-10, with the net unrealized gains or losses reported in net income.
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. Unless we are determined to be the primary beneficiary in a VIE, these participating rights 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. We do not believe that the values of any of our equity investments were impaired as of December 31, 2021. 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 CostsDeferred 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.
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 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. We recognize lease concessions related to COVID-19, such as rent deferrals and abatements, in accordance with the Lease Modification Q&A issued by the FASB in April 2020, which provides entities with the option to elect to account for lease concessions as though the enforceable rights and obligations existed in the original lease. This election is only available when total cash flows resulting from the modified lease are substantially similar to the cash flows in the original lease. When total cash flows resulting from the modified lease are not substantially similar to the cash flows in the original lease, we account for the concession agreement as a new lease. 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.
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 cost	Transaction Costs Transaction costs for 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 and state income tax liability for these entities. During the years ended December 31, 2021, 2020 and 2019, we recorded Federal, state and local tax provisions of $2.8 million, $1.2 million, and $1.5 million, respectively. For the year ended December 31, 2021, the Company paid distributions on its common stock of $8.09 per share which represented $0.50 per share of ordinary income and $5.92 per share of capital gains. For the year ended December 31, 2020, the Company paid distributions on its common stock of $5.54 per share which represented $1.84 per share of ordinary income, and $3.06 per share of capital gains. For the year ended December 31, 2019, the Company paid distributions on its common stock of $3.40 per share which represented $2.59 per share of ordinary income and $0.81 per share of capital gains. In order to present information that is consistent with the tax forms issued with respect to these tax years, these per-share numbers have not been retroactively adjusted to reflect the reverse stock split that was effectuated in January 2021 and January 2022. 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.
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, such as interest rate swaps, caps, collars and floors, to manage, or hedge, 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 typically include 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 (loss). 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 share has been retroactively adjusted to reflect the reverse stock split effectuated in January 2022 for all periods presented in this Annual Report on Form 10-K.
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. Earnings per unit has been retroactively adjusted for all periods presented in this Annual Report on Form 10-K to reflect the reverse stock split effectuated in January 2022.
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." We perform initial and ongoing evaluations of the credit quality of our tenants and require most tenants to provide security deposits or letters of credit. Though these security deposits and letters of credit are insufficient to meet the total value of a tenant's lease obligation, they are a measure of good faith and a potential source of funds to offset the economic costs associated with lost revenue from that tenant and the costs associated with re-tenanting a space. The properties in our real estate
Reclassification	Reclassification Certain prior year balances have been reclassified to conform to our current year presentation.
Accounting Standards Updates	Accounting Standards Updates In July 2021, the FASB issued ASU No. 2021-05 Leases (Topic 842) Lessors - Certain Leases with Variable Lease Payments. ASU 2021-05 amends the lease classification requirements for lessors when classifying and accounting for a lease with variable lease payments that do not depend on a reference rate index or a rate. The update provides criteria, that if met, the lease would be classified and accounted for as an operating lease. ASU 2021-05 is effective for reporting periods beginning after December 15, 2021, with early adoption permitted. We are currently evaluating the impact of the adoption of ASU 2021-05 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 August 2020, the FASB issued Accounting Standard Update, or "ASU," No. 2020-06 Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40). ASU 2020-06 simplifies the accounting for convertible instruments by reducing the number of accounting models for convertible debt instruments and convertible preferred stock, removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and also simplifies the diluted earnings per share calculation in certain areas. ASU 2020-06 is effective for reporting periods beginning after December 15, 2021, with early adoption permitted. We are currently evaluating the impact of the adoption of ASU 2020-06 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 March 2020, the FASB issued ASU No. 2020-04 Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting and then in January 2021, the FASB issued ASU No. 2021-01. The amendments provide practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance is optional and is effective between March 12, 2020 and December 31, 2022. The guidance may be elected over time as reference rate reform activities occur. During the first quarter of 2020, the Company elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. The Company continues to evaluate the impact of the guidance and may apply other elections as applicable as additional changes in the market occur.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of commercial office properties	On December 31, 2021, 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 Occupancy (1) (unaudited) Commercial: Manhattan Office 12 8,180,345 10 12,004,183 22 20,184,528 92.1 % Retail 2 17,888 9 301,996 11 319,884 91.2 % Development/Redevelopment (1) 8 2,538,284 3 3,275,508 11 5,813,792 N/A Fee Interest 1 7,684 — — 1 7,684 N/A 23 10,744,201 22 15,581,687 45 26,325,888 92.0 % Suburban Office 7 862,800 — — 7 862,800 78.9 % Total commercial properties 30 11,607,001 22 15,581,687 52 27,188,688 91.5 % Residential: Manhattan Residential 1 82,250 6 445,934 7 528,184 97.0 % Total portfolio 31 11,689,251 28 16,027,621 59 27,716,872 91.6 %

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
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 lease term Furniture and fixtures 4 to 7 years Tenant improvements shorter of remaining term of the lease or useful life
Summary of identified intangible assets (acquired above-market leases and in-place leases) and intangible liabilities (acquired below-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, 2021 and 2020 (in thousands): December 31, 2021 2020 Identified intangible assets (included in other assets): Gross amount $ 199,722 $ 215,673 Accumulated amortization (182,643) (190,523) Net (1) $ 17,079 $ 25,150 Identified intangible liabilities (included in deferred revenue): Gross amount $ 212,767 $ 241,409 Accumulated amortization (210,262) (230,479) Net (1) $ 2,505 $ 10,930 (1) As of December 31, 2021, $1.8 million of net intangible assets and no net intangible liabilities were reclassified to assets held for sale and liabilities related to assets held for sale. As of December 31, 2020, no net intangible assets and no net intangible liabilities were reclassified to assets held for sale and liabilities related to assets held for sale.
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): 2022 505 2023 476 2024 56 2025 234 2026 205
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): 2022 5,575 2023 5,409 2024 3,544 2025 2,027 2026 1,850
Schedule of marketable securities	As of December 31, 2021 and 2020, we held the following marketable securities (in thousands): December 31, 2021 2020 Commercial mortgage-backed securities $ 24,146 $ 28,570 Total marketable securities available-for-sale $ 24,146 $ 28,570 Equity marketable securities $ 10,606 $ — Total investment in marketable securities $ 34,752 $ 28,570
Schedules of concentration of risk, by risk factor	For the years ended December 31, 2021, 2020, and 2019, 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 2021 Property 2020 Property 2019 11 Madison Avenue 10.8% 11 Madison Avenue 8.2% 1185 Avenue of the Americas 7.6% 420 Lexington Avenue 8.3% 420 Lexington Avenue 7.5% 11 Madison Avenue 7.4% 1515 Broadway 8.1% 1185 Avenue of the Americas 6.9% 420 Lexington Avenue 6.6% 1185 Avenue of the Americas 8.0% 1515 Broadway 6.6% 1515 Broadway 6.1% 280 Park Avenue 6.7% 220 East 42nd Street 5.9% One Madison Avenue 6.0% 919 Third Avenue 5.3% 280 Park Ave 5.4% 220 East 42nd Street 5.5% 485 Lexington Avenue 5.3% 555 West 57th Street 5.2%

Property Acquisitions (Tables)

Property Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	2021 Acquisitions The following table summarizes the properties acquired during the year ended December 31, 2021: Property Acquisition Date Property Type Approximate Square Feet Gross Asset Valuation 885 Third Avenue (1) January 2021 Fee Interest 625,000 $ 387.9 461 Fifth Avenue (2) June 2021 Fee Interest 200,000 28.0 1591-1597 Broadway (3) September 2021 Fee Interest 7,684 121.0 690 Madison Avenue (4) September 2021 Fee Interest 7,848 72.2 (1) In January 2021, pursuant to the partnership documents of our 885 Third Avenue investment, certain participating rights of the common member expired. As a result, it was determined that this investment is a VIE in which we are 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. Prior to January 2021, the investment was accounted for under the equity method. See Note 6, "Investments in Unconsolidated Joint Ventures" and Note 16, "Fair Value Measurements. (2) In April 2021, the Company exercised its option to acquire the fee interest in the property from the ground lessor and the Company acquired the fee interest in June 2021. The Company held the leasehold interest in the property prior to exercising its option. (3) A third party has asserted ownership rights to the fee, which the Company is contesting. (4) In September 2021, the Company was the successful bidder for the fee interest in 690 Madison Avenue at the foreclosure of the asset. The property previously served as collateral for a debt and preferred equity investment. We recorded the assets acquired and liabilities assumed at fair value. See Note 5, "Debt and Preferred Equity Investments" and Note 16, "Fair Value Measurements." 2020 Acquisitions The following table summarizes the properties acquired during the year ended December 31, 2020: Property Acquisition Date Property Type Approximate Square Feet Gross Asset Valuation 762 Madison Avenue (1) January 2020 Fee Interest 6,109 $ 29.3 707 Eleventh Avenue January 2020 Fee Interest 159,720 90.0 15 Beekman (2) January 2020 Leasehold Interest 98,412 — 590 Fifth Avenue (3) October 2020 Fee Interest 103,300 107.2 (1) The Company acquired from our joint venture partner the remaining 10% interest in this property that the Company did not already own. (2) In January 2020, the Company entered into a 99-year ground lease of 126 Nassau Street and subsequently renamed the property 15 Beekman. In August 2020, we entered into a partnership as part of the capitalization of this development project. See note 6, “Investment in Unconsolidated Joint Ventures.” (3) The property previously served as collateral for a debt and preferred equity investment and was acquired through a negotiated transaction with the sponsor. 2019 Acquisitions The following table summarizes the properties acquired during the year ended December 31, 2019 : Property Acquisition Date Property Type Approximate Square Feet Acquisition Price 106 Spring Street (1) April 2019 Fee Interest 5,928 $ 80.2 410 Tenth Avenue (2) May 2019 Fee Interest 638,000 440.0 110 Greene Street (3) May 2019 Fee Interest 223,600 256.5 (1) In April 2019, the Company accepted an assignment of the equity interests in the property in lieu of repayment of the Company's debt investment and marked the assets received and liabilities assumed to fair value. (2) In May 2019, the Company closed on the acquisition of a majority and controlling 70.87% interest in 460 West 34th Street and subsequently renamed the property 410 Tenth Avenue. The Company had previously made a loan to the entity that was accounted for as an Acquisition, Development, and Construction (“ADC”) arrangement. Upon consolidating the entity in which it acquired the controlling equity interest, the Company and the Partnership removed the ADC arrangement and recorded the assets and liabilities of the entity at fair value, which resulted in the recognition of a fair value adjustment of $67.6 million, which was reflected in the Company's consolidated statement of operations within purchase price and other fair value adjustments, and $18.3 million of net intangible lease liabilities. (3) In May 2019, the Company acquired from our joint venture partner the remaining 10% interest in this property that the Company did not already own.

Properties Held for Sale and _2

Properties Held for Sale and Property Dispositions (Tables)	12 Months Ended
	Dec. 31, 2021
Discontinued Operations and Disposal Groups [Abstract]
Summary of properties sold and income from discontinued operations	The following table summarizes the properties sold during the years ended December 31, 2021, 2020, and 2019: Property Disposition Date Property Type Unaudited Approximate Usable Square Feet Sales Price (1) (in millions) Gain (Loss) on Sale (2) (in millions) 110 East 42nd Street December 2021 Fee Interest 215,400 $ 117.1 $ 3.6 590 Fifth Avenue October 2021 Fee Interest 103,300 103.0 (3.2) 220 East 42nd Street (3) July 2021 Fee Interest 1,135,000 783.5 175.1 635-641 Sixth Avenue June 2021 Fee Interest 267,000 325.0 99.4 106 Spring Street (4) March 2021 Fee Interest 5,928 35.0 (2.8) 133 Greene Street (4) February 2021 Fee Interest 6,425 15.8 0.2 712 Madison Avenue (5) January 2021 Fee Interest 6,600 43.0 (1.4) 30 East 40th Street December 2020 Leasehold Interest 69,446 5.2 (1.6) 1055 Washington Boulevard December 2020 Leasehold Interest 182,000 23.8 (11.5) Williamsburg Terrace December 2020 Fee Interest 52,000 32.0 11.8 410 Tenth Avenue December 2020 Fee Interest 638,000 952.5 56.4 400 East 58th Street September 2020 Fee Interest 140,000 62.0 8.3 609 Fifth Avenue - Retail Condominium May 2020 Fee Interest 21,437 168.0 63.3 315 West 33rd Street - The Olivia March 2020 Fee Interest 492,987 446.5 71.8 Suburban Properties (6) December 2019 Fee Interest 1,107,000 229.2 1.8 1640 Flatbush Avenue December 2019 Fee Interest 1,000 16.2 5.5 562 Fifth Avenue December 2019 Fee Interest 42,635 52.4 (26.6) 1010 Washington Boulevard (7) November 2019 Fee Interest 143,400 23.1 (7.1) 115 Spring Street (8) August 2019 Fee Interest 5,218 66.6 3.6 (1) Sales price represents the gross sales price for a property or the gross asset valuation for interests in a property. (2) The gain on sale is net of $13.7 million, $10.5 million, and $2.0 million of employee compensation accrued in connection with the realization of these investment gains in the years ended December 31, 2021, 2020, and 2019, respectively. Additionally, amounts do not include adjustments for expenses recorded in subsequent periods. (3) In July 2021, the Company sold a 49% interest, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million, which 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 Ventures." (4) In the first quarter of 2021, the property was foreclosed by the lender. (5) Disposition resulted from the buyer exercising its purchase option under a ground lease arrangement. (6) Suburban Properties consists of 360 Hamilton Avenue, 100 Summit Lake Drive, 200 Summit Lake Drive, and 500 Summit Lake Drive. (7) The Company recorded a $7.1 million charge in 2019 that is included in depreciable real estate reserves and impairments in the consolidated statement of operations. (8) The Company sold a 49% interest, which resulted in the deconsolidation of our remaining 51% interest. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $3.8 million, which 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 Ventures."

Debt and Preferred Equity Inv_2

Debt and Preferred Equity Investments (Tables)	12 Months Ended
	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Schedule of debt and preferred equity book balance roll forward	Below is a summary of the activity in our debt and preferred equity investments for the years ended December 31, 2021 and 2020 (in thousands): December 31, 2021 December 31, 2020 Balance at beginning of year (1) $ 1,076,542 $ 1,580,306 Debt investment originations/fundings/accretion (2) 193,824 389,300 Preferred equity investment originations/accretion (2) 13,220 167,042 Redemptions/sales/syndications/equity ownership/amortization (3) (201,446) (1,048,643) Net change in loan loss reserves 6,583 (11,463) Balance at end of period (1) $ 1,088,723 $ 1,076,542 (1) Net of unamortized fees, discounts, and premiums. (2) Accretion includes amortization of fees and discounts and paid-in-kind investment income. (3) Certain participations in debt investments that were sold or syndicated, but did not meet the conditions for sale accounting, are included in Other assets and Other liabilities on the consolidated balance sheets.
Schedule of Debt	Below is a summary of our debt and preferred equity investments as of December 31, 2021 (dollars in thousands): Floating Rate Fixed Rate Total Carrying Value Senior Financing Maturity (1) Type Carrying Value Face Value Interest Rate Carrying Value Face Value Interest Rate Senior Mortgage Debt $ 22,646 $ 22,841 L + 3.50 - 3.50% $ 73,000 $ 73,000 3.00% $ 95,646 $ — 2022 - 2023 Mezzanine Debt 272,324 273,274 L + 5.00 - 12.57% 447,747 457,474 2.90 - 14.30% 720,071 4,664,200 2022 - 2029 Preferred Equity — — — 273,006 273,821 6.50 - 11.00% 273,006 1,962,750 2022 - 2027 Balance at end of period $ 294,970 $ 296,115 $ 793,753 $ 804,295 $ 1,088,723 $ 6,626,950 (1) Excludes available extension options to the extent they have not been exercised as of the date of this filing.
Allowance for credit losses on financing receivables	The following table is a rollforward of our total allowance for loan losses for the years ended December 31, 2021, 2020 and 2019 (in thousands): December 31, 2021 2020 2019 Balance at beginning of year $ 13,213 $ 1,750 $ 5,750 Cumulative adjustment upon adoption of ASC 326 — 27,803 — Current period provision for loan loss — 20,693 — Write-offs charged against the allowance (1) (6,583) (37,033) (4,000) Balance at end of period (2) $ 6,630 $ 13,213 $ 1,750 (1) Includes $0.0 million and $19.0 million of charges recorded against investments that were sold during the year ended December 31, 2021 and 2020, respectively. These charges are included in loan loss and other investment reserves, net of recoveries, in our consolidated statements of operations. (2) As of December 31, 2021, all financing receivables on non-accrual had an allowance for loan loss except for one debt investment with a carrying value of $225.4 million.
Summary of debt investments	As of December 31, 2021 and 2020, we held the following debt investments with an aggregate weighted average current yield of 6.52%, as of December 31, 2021 (dollars in thousands): Loan Type December 31, 2021 December 31, 2021 December 31, 2021 Carrying Value (1) December 31, 2020 Carrying Value (1) Maturity Date (2) Fixed Rate Investments: Mezzanine Loan $ — $ 280,000 $ 43,521 $ 41,057 August 2022 Mortgage Loan — — 73,000 — April 2023 Mezzanine Loan (3) — 376,705 225,367 225,204 June 2023 Mezzanine Loan — 274,976 66,873 — June 2023 Mezzanine Loan (4a)(5) — 105,000 13,366 13,366 June 2024 Mezzanine Loan — 95,000 30,000 30,000 January 2025 Mezzanine Loan (6) — 1,712,750 55,250 55,250 June 2027 Mezzanine Loan — 85,000 20,000 20,000 December 2029 Junior Mortgage — — — 32,888 Mezzanine Loan — — — 3,500 Mortgage/Mezzanine Loan — — — 56,244 Total fixed rate $ — $ 2,929,431 $ 527,377 $ 477,509 Floating Rate Investments: Mezzanine Loan $ — $ 275,000 $ 49,998 $ 49,956 April 2022 Mezzanine Loan 4,933 180,415 37,511 35,318 July 2022 Mezzanine Loan (4b) — 1,115,000 133,735 127,915 March 2022 Mezzanine Loan 3,932 54,000 8,050 6,858 May 2022 Mortgage and Mezzanine Loan 23,360 — 34,874 14,011 December 2022 Mezzanine Loan 43,415 110,354 30,802 19,889 May 2023 Junior Mortgage Participation/Mezzanine Loan — — — 15,733 Mezzanine Loan — — — 29,106 Mortgage Loan — — — 53,674 Total floating rate $ 75,640 $ 1,734,769 $ 294,970 $ 352,460 Allowance for loan loss $ — $ — $ (6,630) $ (13,213) Total $ 75,640 $ 4,664,200 $ 815,717 $ 816,756 (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) This loan was put on non-accrual in July 2020 and remains on non-accrual as of December 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower. (4) Carrying value is net of the following amounts that were sold or syndicated, which are included in Other assets and Other liabilities on the consolidated balance sheets as a result of the transfers not meeting the conditions for sale accounting: (a) $12.0 million, and (b) $0.4 million. (5) This loan went into default and was put on non-accrual in June 2020 and remains on non-accrual as of December 31, 2021. No investment income has been recognized subsequent to it being put on non-accrual. The Company is in discussions with the borrower. Additionally, we determined the borrower entity to be a VIE in which we are not the primary beneficiary. (6) The borrower under this mezzanine loan is an entity affiliated with HNA, which owns an equity interest in 245 Park Avenue. The borrower filed for bankruptcy protection on October 31, 2021, which the Company contested.
Summary of preferred equity investments	As of December 31, 2021 and 2020, we held the following preferred equity investments with an aggregate weighted average current yield of 9.87% as of December 31, 2021 (dollars in thousands): Type December 31, 2021 December 31, 2021 December 31, 2021 (1) December 31, 2020 (1) Mandatory Redemption (2) Preferred Equity (3) $ — $ 1,712,750 $ 160,772 $ 154,691 June 2022 Preferred Equity — 250,000 112,234 105,095 February 2027 Total Preferred Equity $ — $ 1,962,750 $ 273,006 $ 259,786 Allowance for loan loss $ — $ — $ — $ — Total $ — $ 1,962,750 $ 273,006 $ 259,786 (1) Carrying value is net of deferred origination fees. (2) Represents contractual redemption, excluding any unexercised extension options. (3) 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. The Company contested the filing, on the basis that the filing was done in bad faith and in violation of HNA's agreements with the Company, and is currently appealing the Bankruptcy court’s ruling upholding the filing by HNA.
Schedule of Investment In Financing Receivables 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, 2021 and 2020 ($ in thousands): Risk Rating December 31, 2021 December 31, 2020 1 - Low Risk Assets - Low probability of loss $ 644,489 $ 695,035 2 - Watch List Assets - Higher potential for loss 437,344 365,167 3 - High Risk Assets - Loss more likely than not 6,890 16,340 $ 1,088,723 $ 1,076,542 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, 2021 (dollars in thousands): As of December 31, Risk Rating 2021 (1) 2020 (1) 2019 (1) Prior (1) Total 1 - Low Risk Assets - Low probability of loss $ 139,873 $ 151,086 $ 57,511 $ 296,019 $ 644,489 2 - Watch List Assets - Higher potential for loss — 133,735 260,242 43,367 437,344 3 - High Risk Assets - Loss more likely than not — — — 6,890 6,890 $ 139,873 $ 284,821 $ 317,753 $ 346,276 $ 1,088,723 (1) Year in which the investment was originated or acquired by us or in which a material modification occurred.

Investments in Unconsolidated_2

Investments in Unconsolidated Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Schedule of general information on joint ventures	The table below provides general information on each of our joint ventures as of December 31, 2021: Property Partner Ownership Interest (1) Economic Interest (1) Unaudited Approximate Square Feet 100 Park Avenue Prudential Real Estate Investors 49.90% 49.90% 834,000 717 Fifth Avenue Wharton Properties/Private Investor 10.92% 10.92% 119,500 800 Third Avenue Private Investors 60.52% 60.52% 526,000 919 Third Avenue New York State Teacher's Retirement System 51.00% 51.00% 1,454,000 11 West 34th Street Private Investor/Wharton Properties 30.00% 30.00% 17,150 280 Park Avenue Vornado Realty Trust 50.00% 50.00% 1,219,158 1552-1560 Broadway (2) Wharton Properties 50.00% 50.00% 57,718 10 East 53rd Street Canadian Pension Plan Investment Board 55.00% 55.00% 354,300 21 East 66th Street (3) Private Investors 32.28% 32.28% 13,069 650 Fifth Avenue (4) Wharton Properties 50.00% 50.00% 69,214 121 Greene Street Wharton Properties 50.00% 50.00% 7,131 Stonehenge Portfolio (5) Various Various Various 1,439,016 11 Madison Avenue PGIM Real Estate 60.00% 60.00% 2,314,000 One Vanderbilt Avenue National Pension Service of Korea/Hines Interest LP 71.01% 71.01% 1,657,198 Worldwide Plaza (6) RXR Realty / New York REIT 24.95% 24.95% 2,048,725 1515 Broadway Allianz Real Estate of America 56.87% 56.87% 1,750,000 2 Herald Square Israeli Institutional Investor 51.00% 51.00% 369,000 115 Spring Street Private Investor 51.00% 51.00% 5,218 15 Beekman (7) A fund managed by Meritz Alternative Investment Management 20.00% 20.00% 221,884 85 Fifth Avenue Wells Fargo 36.27% 36.27% 12,946 One Madison Avenue (8) National Pension Service of Korea/Hines Interest LP/International Investor 25.50% 25.50% 1,048,700 220 East 42nd Street (9) A fund managed by Meritz Alternative Investment Management 51.00% 51.00% 1,135,000 (1) Ownership interest and economic interest represent the Company's interests in the joint venture as of December 31, 2021. Changes in ownership or economic interests within the current year are disclosed in the notes below. (2) 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. (3) We hold a 32.28% interest in three retail units and one residential unit at the property and a 16.14% interest in two residential units at the property. (4) The joint venture owns a long-term leasehold interest in the retail space at 650 Fifth Avenue. (5) During the fourth quarter of 2021, the Company recorded a $3.1 million charge in connection with the pending sale of this investment for a gross consideration of approximately $1.0 million. This charge is included in Depreciable real estate reserves and impairments in the consolidated statement of operations. (6) In May 2021, the Company and RXR Realty jointly acquired a 1.2% interest in the property previously held by a private investor. This resulted in an increase in the Company's ownership interest of 0.6%. (7) In 2020, the Company formed a joint venture, which then entered into a long-term sublease with the Company. (8) In 2020, the Company admitted partners to the One Madison Avenue development project, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of our remaining 50.5% interest. We recorded our investment at fair value, which resulted in the recognition of a fair value adjustment of $187.5 million. The fair value of our investment was determined by the terms of the joint venture agreement governing the capitalization of the project. The partners have committed aggregate equity to the project totaling no less than $492.2 million and their ownership interest in the joint venture is based on their capital contributions, up to an aggregate maximum of 49.5%. As of December 31, 2021, the total of the two partners' ownership interests based on equity contributed was 27.1%. In November 2021, the Company admitted an additional partner to the development project for a committed aggregate equity investment totaling no less than $259.3 million. The partner's indirect ownership interest in the joint venture is based on it's capital contributions, up to an aggregate maximum of 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, 2021. (9) In July 2021, the Company sold a 49% interest in the property, which resulted in the Company no longer retaining a controlling interest in the entity, as defined in ASC 810, and the deconsolidation of the 51.0% interest we retained. We recorded our investment at fair value which resulted in the recognition of a fair value adjustment of $206.8 million during the year ended December 31, 2021. The fair value of our investment was determined by the terms of the joint venture agreement. The following table summarizes the investments in unconsolidated joint ventures sold during the years ended December 31, 2021, 2020, and 2019: Property Ownership Interest Sold Disposition Date Gross Asset Valuation Gain (Loss) on Sale (in millions) (1) (2) 400 East 47th Street (3) 41.00% September 2021 $ 133.5 $ (1.0) 605 West 42nd Street - Sky 20.00% June 2021 858.1 8.9 55 West 46th Street - Tower 46 25.00% March 2021 275.0 (15.2) 885 Third Avenue (4) N/A January 2021 N/A N/A 333 East 22nd Street 33.33% December 2020 1.6 3.0 21 East 66th Street (5) 1 residential unit December 2019 2.9 0.3 521 Fifth Avenue 50.50% May 2019 381.0 57.9 131-137 Spring Street 20.00% January 2019 216.0 17.7 Stonehenge Portfolio (partial) Various Various - 2019 468.8 (2.4) (1) Represents the Company's share of the gain or loss (2) The gain on sale is net of $1.4 million, $0.0 million, and $4.0 million of employee compensation accrued in connection with the realization of these investment gains in the years ended December 31, 2021, 2020, and 2019, respectively. Additionally, gain (loss) amounts do not include adjustments for expenses recorded in subsequent periods. (3) In connection with our agreement to sell the property in April 2021, we recorded a charge of $5.7 million, which is included in Depreciable real estate reserves and impairments in the consolidated statements of operations. (4) In January 2021, pursuant to the partnership documents, certain participating rights of the common member expired. As a result, it was determined that we are the primary beneficiary of the VIE and the investment was consolidated in our financial statements. See Note 3, "Property Acquisitions." (5) We, together with our joint venture partner, closed on the sale of one residential unit at the property.
Schedule of first mortgage notes 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, 2021 and 2020, respectively, are as follows (dollars in thousands): Property Economic Interest (1) Current Maturity Date Final Maturity Date (2) Interest Rate (3) December 31, 2021 December 31, 2020 Fixed Rate Debt: 717 Fifth Avenue (mortgage) 10.92 % July 2022 July 2022 4.45% $ 300,000 $ 300,000 717 Fifth Avenue (mezzanine) 10.92 % July 2022 July 2022 5.50% 355,328 355,328 650 Fifth Avenue (mortgage) 50.00 % October 2022 October 2022 4.46% 210,000 210,000 650 Fifth Avenue (mezzanine) 50.00 % October 2022 October 2022 5.45% 65,000 65,000 21 East 66th Street 32.28 % April 2023 April 2028 3.60% 12,000 12,000 919 Third Avenue 51.00 % June 2023 June 2023 5.12% 500,000 500,000 1515 Broadway 56.87 % March 2025 March 2025 3.93% 801,845 820,607 11 Madison Avenue 60.00 % September 2025 September 2025 3.84% 1,400,000 1,400,000 800 Third Avenue 60.52 % February 2026 February 2026 3.37% 177,000 177,000 Worldwide Plaza 24.95 % November 2027 November 2027 3.98% 1,200,000 1,200,000 One Vanderbilt Avenue 71.01 % July 2031 July 2031 2.95% 3,000,000 — Stonehenge Portfolio (4) Various Various Various 3.50% 195,493 195,899 400 East 57th Street — 97,024 885 Third Avenue — 272,000 Total fixed rate debt $ 8,216,666 $ 5,604,858 Floating Rate Debt: 1552 Broadway 50.00 % October 2022 October 2022 L+ 2.65% $ 193,132 $ 195,000 280 Park Avenue 50.00 % September 2022 September 2024 L+ 1.73% 1,200,000 1,200,000 121 Greene Street 50.00 % November 2022 November 2022 L+ 2.00% 13,228 15,000 2 Herald Square 51.00 % November 2022 November 2023 L+ 1.95% 200,989 214,500 11 West 34th Street 30.00 % January 2023 January 2023 L+ 1.45% 23,000 23,000 220 East 42nd Street 51.00 % June 2023 June 2025 L+ 2.75% 510,000 — 115 Spring Street 51.00 % September 2023 September 2023 L+ 3.40% 65,550 65,550 100 Park Avenue 49.90 % December 2023 December 2025 L+ 2.25% 360,000 360,000 15 Beekman (5) 20.00 % January 2024 July 2025 L+ 1.50% 43,566 11,212 10 East 53rd Street 55.00 % February 2025 February 2025 L+ 1.35% 220,000 220,000 One Madison Avenue (6) 25.50 % November 2025 November 2026 L+ 3.35% 169,629 — 21 East 66th Street 32.28 % June 2033 June 2033 T+ 2.75% 632 677 One Vanderbilt Avenue — 1,210,329 605 West 42nd Street — 550,000 55 West 46th Street — 192,524 Total floating rate debt $ 2,999,726 $ 4,257,792 Total joint venture mortgages and other loans payable $ 11,216,392 $ 9,862,650 Deferred financing costs, net (130,516) (113,446) Total joint venture mortgages and other loans payable, net $ 11,085,876 $ 9,749,204 (1) Economic interest represents the Company's interests in the joint venture as of December 31, 2021. 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 options. The ability to exercise extension options may be subject to certain conditions, including meeting tests based on the operating performance of the property. (3) Interest rates as of December 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR ("L") or 1-year Treasury ("T"). (4) Comprised of three mortgages totaling $132.2 million that mature in April 2028 and two mortgages totaling $63.3 million that mature in July 2029. (5) This loan is a $125.0 million construction facility. Advances under the loan are subject to costs incurred. (6) The loan is a $1.25 billion construction facility with an initial term of five years with one, one year extension option. Advances under the loan are subject to costs incurred. In conjunction with the loan, we provided partial guarantees for interest and principal payments, the amounts of which are based on certain construction milestones and operating metrics.
Schedule of combined balance sheets for the unconsolidated joint ventures	The combined balance sheets for the unconsolidated joint ventures, as of December 31, 2021 and 2020, are as follows (in thousands): December 31, 2021 December 31, 2020 Assets (1) Commercial real estate property, net $ 14,763,874 $ 16,143,880 Cash and restricted cash 768,510 357,076 Tenant and other receivables, related party receivables, and deferred rents receivable 533,455 403,883 Other assets 1,776,030 2,001,612 Total assets $ 17,841,869 $ 18,906,451 Liabilities and equity (1) Mortgages and other loans payable, net $ 11,085,876 $ 9,749,204 Deferred revenue/gain 1,158,242 1,341,571 Lease liabilities 980,595 1,002,563 Other liabilities 352,499 464,107 Equity 4,264,657 6,349,006 Total liabilities and equity $ 17,841,869 $ 18,906,451 Company's investments in unconsolidated joint ventures $ 2,997,934 $ 3,823,322 (1) As of December 31, 2021, $544.4 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, 2021, 2020, and 2019 are as follows (unaudited, in thousands): Year Ended December 31, 2021 2020 2019 Total revenues $ 1,228,364 $ 1,133,217 $ 1,163,534 Operating expenses 203,332 180,201 202,881 Real estate taxes 225,104 220,633 212,355 Operating lease rent 22,576 24,134 24,816 Interest expense, net of interest income 342,910 325,500 372,408 Amortization of deferred financing costs 31,423 20,427 19,336 Depreciation and amortization 484,130 407,834 407,697 Total expenses $ 1,309,475 $ 1,178,729 $ 1,239,493 Loss on early extinguishment of debt (2,017) (194) (1,031) Net loss before gain on sale $ (83,128) $ (45,706) $ (76,990) Company's equity in net loss from unconsolidated joint ventures $ (55,402) $ (25,195) $ (34,518)

Deferred Costs (Tables)

Deferred Costs (Tables)	12 Months Ended
	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Deferred Costs	Deferred costs as of December 31, 2021 and 2020 consisted of the following (in thousands): December 31, 2021 2020 Deferred leasing costs $ 400,419 $ 447,002 Less: accumulated amortization (275,924) (269,834) Deferred costs, net $ 124,495 $ 177,168

Mortgages and Other Loans Pay_2

Mortgages and Other Loans Payable (Tables)	12 Months Ended
	Dec. 31, 2021
Mortgages and Other Loans Payable
Schedule of first mortgages and other loans payable collateralized by the respective properties and assignment of leases	The mortgages and other loans payable collateralized by the respective properties and assignment of leases or debt investments as of December 31, 2021 and 2020, respectively, were as follows (dollars in thousands): Property Current Maturity Date Final Maturity Date (1) Interest Rate (2) December 31, 2021 December 31, 2020 Fixed Rate Debt: 100 Church Street July 2022 July 2022 4.68% $ 200,212 $ 204,875 420 Lexington Avenue October 2024 October 2040 3.99% 288,660 294,035 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 1080 Amsterdam (3) February 2027 February 2027 3.59% 34,537 34,773 Total fixed rate debt $ 1,073,409 $ 1,083,683 Floating Rate Debt: 609 Fifth Avenue March 2022 March 2025 L+ 2.95% $ 52,882 $ 57,651 7 Dey / 185 Broadway (4) November 2022 November 2023 L+ 2.85% 198,169 158,478 719 Seventh Avenue September 2023 September 2023 L+ 1.20% 50,000 50,000 690 Madison Avenue July 2024 July 2025 L+ 1.60% 60,000 — 220 East 42nd Street (5) — 510,000 133 Greene Street — 15,523 106 Spring Street — 38,025 FHLB Facility — 10,000 FHLB Facility — 15,000 FHLB Facility — 35,000 712 Madison Avenue — 28,000 2017 Master Repurchase Agreement (6) — — Total floating rate debt $ 361,051 $ 917,677 Total fixed rate and floating rate debt $ 1,434,460 $ 2,001,360 Mortgages reclassed to liabilities related to assets held for sale (34,537) — Total mortgages and other loans payable $ 1,399,923 $ 2,001,360 Deferred financing costs, net of amortization (5,537) (21,388) Total mortgages and other loans payable, net $ 1,394,386 $ 1,979,972 (1) Reflects exercise of all available options. The ability to exercise extension options may be subject to certain tests based on the operating performance of the property. (2) Interest rate as of December 31, 2021, taking into account interest rate hedges in effect during the period. Floating rate debt is presented with the stated spread over the 30-day LIBOR, unless otherwise specified. (3) The loan is comprised of a $33.6 million mortgage loan and $0.9 million mezzanine loan with a fixed interest rate of 350 basis points and 700 basis points, respectively, for the first five years and is prepayable without penalty at the end of the fifth year. (4) This loan is a $225.0 million construction facility, with reductions in interest cost based on meeting certain conditions, and has an initial three year term with two one year extension options. In October 2021, an extension option was exercised, and the maturity date of this loan was extended by one year. Advances under the loan are subject to incurred costs and funded equity requirements. (5) In July 2021, the Company sold a 49% interest in the property. See Note 4, "Property Dispositions." (6) In June 2021, we exercised a one year extension option which extended the maturity date to June 2022. As of December 31, 2021, there was no outstanding balance on the $400.0 million facility.

Corporate Indebtedness (Tables)

Corporate Indebtedness (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 and 2020, respectively, by scheduled maturity date (dollars in thousands): Issuance December 31, December 31, December 31, Interest Rate (1) Initial Term Maturity Date October 5, 2017 (2) $ 500,000 $ 499,913 $ 499,803 3.25 % 5 October 2022 November 15, 2012 (3) 300,000 301,002 302,086 4.50 % 10 December 2022 December 17, 2015 (4) 100,000 100,000 100,000 4.27 % 10 December 2025 August 7, 2018 — — 350,000 — % 3 August 2021 $ 900,000 $ 900,915 $ 1,251,889 Deferred financing costs, net (1,607) (3,670) $ 900,000 $ 899,308 $ 1,248,219 (1) Interest rate as of December 31, 2021, taking into account interest rate hedges in effect during the period. (2) Issued by the Operating Partnership with the Company as the guarantor. (3) In October 2017, the Company and the Operating Partnership as co-obligors issued an additional $100.0 million of 4.50% senior unsecured notes due December 2022. The notes were priced at 105.334% of par. (4) Issued by the Company and the Operating Partnership as co-obligors.
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, 2021, including as-of-right extension options, were as follows (in thousands): Scheduled Principal Revolving Unsecured Term Loans Trust Senior Total Joint 2022 $ 8,754 $ 448,835 $ — $ — $ — $ 800,000 $ 1,257,589 $ 426,057 2023 6,583 50,000 — — — — 56,583 750,696 2024 5,268 332,749 — 200,000 — — 538,017 616,510 2025 812 — — — — 100,000 100,812 1,391,185 2026 841 — 390,000 — — — 390,841 150,486 Thereafter 70 580,548 — 1,050,000 100,000 — 1,730,618 2,435,913 $ 22,328 $ 1,412,132 $ 390,000 $ 1,250,000 $ 100,000 $ 900,000 $ 4,074,460 $ 5,770,847
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, 2021 2020 2019 Interest expense before capitalized interest $ 145,197 $ 185,934 $ 246,848 Interest on financing leases 5,448 8,091 3,243 Interest capitalized (78,365) (75,167) (55,446) Interest income (1,389) (2,179) (4,124) Interest expense, net $ 70,891 $ 116,679 $ 190,521

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Schedule of amounts due from/to related parties	Amounts due from joint ventures and related parties as of December 31, 2021 and 2020 consisted of the following (in thousands): December 31, 2021 2020 Due from joint ventures $ 28,204 $ 27,006 Other 1,204 7,651 Related party receivables $ 29,408 $ 34,657

Noncontrolling Interests on t_2

Noncontrolling Interests on the Company's Consolidated Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2021
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interest	Below is a summary of the activity relating to the noncontrolling interests in the Operating Partnership for twelve months ended December 31, 2021 and 2020 (in thousands): December 31, 2021 2020 Balance at beginning of period $ 358,262 $ 409,862 Distributions (15,749) (12,652) Issuance of common units 18,678 12,018 Redemption and conversion of common units (53,289) (36,085) Net income 25,457 20,016 Accumulated other comprehensive loss allocation 1,042 (2,299) Fair value adjustment 9,851 (32,598) Balance at end of period $ 344,252 $ 358,262
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, 2021: 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) 3.50 % 109,161 109,161 109,161 $ 35.0000 $ 1,000.00 $ — August 2015 Series F 7.00 % 60 60 60 70.0000 1,000.00 29.12 January 2007 Series G (5) 4.50 % 1,902,000 1,902,000 718,697 1.1250 25.00 88.50 January 2012 Series K 3.50 % 700,000 563,954 341,677 0.8750 25.00 134.67 August 2014 Series L 4.00 % 500,000 378,634 372,634 1.0000 25.00 — August 2014 Series P 4.00 % 200,000 200,000 200,000 1.0000 25.00 — July 2015 Series Q 3.50 % 268,000 268,000 268,000 0.8750 25.00 148.95 July 2015 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 3.50 % 40,000 40,000 40,000 0.8750 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 unitholder 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 convertible on a one-for-one basis, into the Series B Preferred Units of limited partnership interest, or the Subsidiary Series B Preferred Units. The Subsidiary Series B Preferred Units can be converted at any time, at the option of the unitholder, into a number of common stock equal to 6.71348 shares of common stock for each Subsidiary Series B Preferred Unit. As of December 31, 2021, no Subsidiary Series B Preferred Units have been issued. (5) Common units of limited partnership interest in the Operating Partnership issued in a conversion may be redeemed in exchange for our common stock on a 1-to-1 basis. The Series G Preferred Units also provided the holder with the right to require the Operating Partnership to repurchase the Series G Preferred Units for cash before January 31, 2022, which the holder did not execute. (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 twelve months ended December 31, 2021 and 2020 (in thousands): December 31, 2021 2020 Balance at beginning of period $ 202,169 $ 283,285 Issuance of preferred units — — Redemption of preferred units (6,040) (82,750) Dividends paid on preferred units (6,760) (6,163) Accrued dividends on preferred units 6,706 7,797 Balance at end of period $ 196,075 $ 202,169

Stockholders' Equity of the C_2

Stockholders' Equity of the Company (Tables)	12 Months Ended
	Dec. 31, 2021
Stockholders' Equity Note [Abstract]
Class of Treasury Stock	As of December 31, 2021, share repurchases, excluding the redemption of OP Units, executed under the program were as follows: Period Shares repurchased Average price paid per share Cumulative number of shares repurchased as part of the repurchase plan or programs Year ended 2017 7,865,206 $107.81 7,865,206 Year ended 2018 9,187,480 $102.06 17,052,686 Year ended 2019 4,333,260 $88.69 21,385,946 Year ended 2020 8,285,460 $64.30 29,671,406 Year ended 2021 4,474,649 $75.44 34,146,055
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, 2021, 2020, and 2019, respectively (dollars in thousands): Year Ended December 31, 2021 2020 2019 Shares of common stock issued 10,387 16,181 3,645 Dividend reinvestments/stock purchases under the DRSPP $ 738 $ 1,006 $ 334
Schedule of Earnings Per Share	SL Green's earnings per share for the years ended December 31, 2021, 2020, and 2019 are computed as follows (in thousands): Year Ended December 31, Numerator 2021 2020 2019 Basic Earnings: Income attributable to SL Green common stockholders $ 434,804 $ 356,105 $ 255,484 Less: distributed earnings allocated to participating securities (2,398) (1,685) (1,700) Less: undistributed earnings allocated to participating securities (192) (137) — Net income attributable to SL Green common stockholders (numerator for basic earnings per share) $ 432,214 $ 354,283 $ 253,784 Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 2,039 1,685 1,700 Add back: undistributed earnings allocated to participating securities 192 137 — Add back: Effect of dilutive securities (redemption of units to common shares) 25,457 20,016 13,301 Income attributable to SL Green common stockholders (numerator for diluted earnings per share) $ 459,902 $ 376,121 $ 268,785 Year Ended December 31, Denominator 2021 2020 2019 Basic Shares: Weighted average common stock outstanding 65,740 70,397 77,057 Effect of Dilutive Securities: Operating Partnership units redeemable for common shares 3,987 4,096 4,275 Stock-based compensation plans 705 441 533 Contingently issuable shares 337 144 — Diluted weighted average common stock outstanding 70,769 75,078 81,865

Partners' Capital of the Oper_2

Partners' Capital of the Operating Partnership (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021, 2020, and 2019 respectively are computed as follows (in thousands): Year Ended December 31, Numerator 2021 2020 2019 Basic Earnings: Net income attributable to SLGOP common unitholders (numerator for diluted earnings per unit) $ 460,261 $ 376,121 $ 268,785 Less: distributed earnings allocated to participating securities (2,398) (1,685) (1,700) Less: undistributed earnings allocated to participating securities (192) (137) — Net Income attributable to SLGOP common unitholders (numerator for basic earnings per unit) $ 457,671 $ 374,299 $ 267,085 Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares 2,590 1,822 1,700 Income attributable to SLGOP common unitholders $ 460,261 $ 376,121 $ 268,785 Year Ended December 31, Denominator 2021 2020 2019 Basic units: Weighted average common units outstanding 69,667 74,493 81,332 Effect of Dilutive Securities: Stock-based compensation plans 765 441 543 Contingently issuable units 337 144 (10) Diluted weighted average common units outstanding 70,769 75,078 81,865

Share-based Compensation (Table

Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of weighted average assumptions used to estimate the grant date fair value of options granted	There were no options granted during the years ended December 31, 2021, 2020, and 2019.
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, 2021, 2020, and 2019 and changes during the years ended December 31, 2021, 2020, and 2019 are as follows: 2021 2020 2019 Options Outstanding Weighted Average Options Outstanding Weighted Average Options Weighted Balance at beginning of year 761,686 $ 105.76 977,745 $ 108.57 1,071,977 $ 109.82 Exercised (11,314) 72.30 — — — — Lapsed or canceled (356,283) 112.56 (216,059) 118.49 (94,232) 122.84 Balance at end of year 394,089 $ 100.56 761,686 $ 105.76 977,745 $ 108.57 Options exercisable at end of year 394,089 $ 100.56 760,743 $ 105.76 862,593 $ 107.86
Schedule of other share-based compensation, activity	A summary of the Company's restricted stock as of December 31, 2021, 2020, and 2019 and changes during the years ended December 31, 2021, 2020, and 2019 are as follows: 2021 2020 2019 Balance at beginning of year 3,337,545 3,362,456 3,254,553 Granted 141,515 8,693 119,122 Canceled (19,697) (33,604) (11,219) Balance at end of year 3,459,363 3,337,545 3,362,456 Vested during the year 122,759 125,064 106,780 Compensation expense recorded $ 8,497,054 $ 10,895,459 $ 12,892,249 Total fair value of restricted stock granted during the year $ 9,214,531 $ 734,315 $ 11,131,181

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2021
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	The following tables set forth the changes in accumulated other comprehensive (loss) income by component as of December 31, 2021, 2020 and 2019 (in thousands): Net unrealized (loss) gain on derivative instruments ( 1 ) SL Green’s share of joint venture net unrealized (loss) gain on derivative instruments ( 2 ) Net unrealized gain on marketable securities Total Balance at December 31, 2018 $ 9,716 $ 4,299 $ 1,093 $ 15,108 Other comprehensive (loss) income before reclassifications (32,723) (11,956) 1,184 (43,495) Amounts reclassified from accumulated other comprehensive loss 227 (325) — (98) Balance at December 31, 2019 (22,780) (7,982) 2,277 (28,485) Other comprehensive loss before reclassifications (48,532) (7,573) (1,256) (57,361) Amounts reclassified from accumulated other comprehensive loss 13,897 4,702 — 18,599 Balance at December 31, 2020 (57,415) (10,853) 1,021 (67,247) Other comprehensive income (loss) before reclassifications 14,908 (18,015) 96 (3,011) Amounts reclassified from accumulated other comprehensive loss 16,626 6,874 — 23,500 Balance at December 31, 2021 $ (25,881) $ (21,994) $ 1,117 $ (46,758) (1) Amount reclassified from accumulated other comprehensive loss is included in interest expense in the respective consolidated statements of operations. As of December 31, 2021 and 2020, the deferred net gains from these terminated hedges, which is included in accumulated other comprehensive loss relating to net unrealized gain (loss) on derivative instruments, was $(0.6) million and $(0.5) million, respectively. (2) Amount reclassified from accumulated other comprehensive loss 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, 2021
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, 2021 and 2020 (in thousands): December 31, 2021 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 24,146 $ — $ 24,146 $ — Interest rate cap and swap agreements (included in Other assets) $ 1,896 $ — $ 1,896 $ — Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 29,912 $ — $ 29,912 $ — December 31, 2020 Total Level 1 Level 2 Level 3 Assets: Marketable securities available-for-sale $ 28,570 $ — $ 28,570 $ — Interest rate cap and swap agreements (included in Other assets) $ 28 $ — $ 28 $ — Liabilities: Interest rate cap and swap agreements (included in Other liabilities) $ 61,217 $ — $ 61,217 $ —
Fair Value, by Balance Sheet Grouping	The following table provides the carrying value and fair value of these financial instruments as of December 31, 2021 and December 31, 2020 (in thousands): December 31, 2021 December 31, 2020 Carrying Value (1) Fair Value Carrying Value (1) Fair Value Debt and preferred equity investments $ 1,088,723 (2) $ 1,076,542 (2) Fixed rate debt $ 3,274,324 $ 3,336,463 $ 3,135,572 $ 3,237,075 Variable rate debt 801,051 800,672 1,827,677 1,822,740 $ 4,075,375 $ 4,137,135 $ 4,963,249 $ 5,059,815 (1) Amounts exclude net deferred financing costs. (2) As of December 31, 2021, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion. As of December 31, 2020, debt and preferred equity investments had an estimated fair value ranging between $1.0 billion and $1.1 billion.

Financial Instruments_ Deriva_2

Financial Instruments: Derivatives and Hedging (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 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 $ 85,000 4.000 % March 2021 March 2022 Other Assets $ — Interest Rate Cap 111,869 3.500 % November 2021 November 2022 Other Assets 1 Interest Rate Swap 100,000 0.212 % January 2021 January 2023 Other Assets 376 Interest Rate Swap 400,000 0.184 % January 2022 February 2023 Other Assets 1,519 Interest Rate Swap 100,000 1.161 % November 2021 July 2023 Other Liabilities (733) Interest Rate Swap 200,000 1.131 % November 2021 July 2023 Other Liabilities (1,371) Interest Rate Swap 150,000 2.696 % December 2021 January 2024 Other Liabilities (5,625) Interest Rate Swap 150,000 2.721 % December 2021 January 2026 Other Liabilities (9,369) Interest Rate Swap 200,000 2.740 % December 2021 January 2026 Other Liabilities (12,814) $ (28,016) The following table summarizes the notional value at inception and fair value of our joint ventures' derivative financial instruments as of December 31, 2021 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 $ 220,000 4.000 % February 2020 February 2022 $ — Interest Rate Cap 1,075,000 2.850 % September 2021 September 2022 5 Interest Rate Cap 125,000 2.850 % September 2021 September 2022 1 Interest Rate Cap 23,000 4.750 % January 2021 January 2023 1 Interest Rate Cap 510,000 3.000 % December 2021 June 2023 155 Interest Rate Cap 1,250,000 1.250 % November 2020 October 2024 8,657 Interest Rate Swap 177,000 1.669 % March 2016 February 2026 (3,560) $ 5,259
Schedule of effect of derivative financial instruments on consolidated statements of income	The following table presents the effect 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, 2021, 2020, and 2019, respectively (in thousands): Amount of Loss Location of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Income Amount of (Loss) Gain Year Ended Year Ended Derivative 2021 2020 2019 2021 2020 2019 Interest Rate Swaps/Caps $ 15,643 $ (51,244) $ (33,907) Interest expense $ (17,602) $ (14,569) $ (261) Share of unconsolidated joint ventures' derivative instruments (19,400) (7,977) (10,322) Equity in net (loss) income from unconsolidated joint ventures (7,582) (4,911) 256 $ (3,757) $ (59,221) $ (44,229) $ (25,184) $ (19,480) $ (5)

Lease Income (Tables)

Lease Income (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021 are as follows (in thousands): 2022 $ 532,046 2023 485,299 2024 443,632 2025 415,241 2026 374,661 Thereafter 1,655,647 $ 3,906,526
Operating Lease, Lease Income	The components of lease income from operating leases during the years ended December 31, 2021 and 2020 were as follows (in thousands): Twelve Months Ended December 31, 2021 2020 Fixed lease payments $ 600,474 $ 702,482 Variable lease payments 73,542 96,040 Total lease payments $ 674,016 $ 798,522 Amortization of acquired above and below-market leases 4,160 5,901 Total rental revenue $ 678,176 $ 804,423 (1) Amounts include $229.2 million and $237.9 million of sublease income for the years ended December 31, 2021 and 2020, respectively.
Schedule Of Sales Type Leases	The table below summarizes our investment in sales-type leases as of December 31, 2021: 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 Lease, Lease Income	The components of lease income from sales-type leases during the years ended December 31, 2021 and 2020 were as follows (in thousands): Twelve Months Ended December 31, 2021 2020 Loss recognized at commencement, net (1) $ — $ (6,237) Interest income (2) 4,422 1,817 Total gain (loss) recognized on sales-type leases $ 4,422 $ (4,420) (1) These amounts are included in Gain on sale of real estate, net and Depreciable real estate reserves and impairments in our consolidated statements of operations. (2) These amounts are included in Other income in our consolidated statements of operations.
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, 2021 are as follows (in thousands): Sales-type leases 2022 $ 3,087 2023 3,133 2024 3,180 2025 3,228 2026 3,276 Thereafter 203,494 Total minimum lease payments $ 219,398 Amount representing interest (116,376) Investment in sales-type leases (1) $ 103,022 (1) This amount is included in Other assets in our consolidated balance sheets.

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2021
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, 2021, 2020 and 2019 are included in the table below (in thousands): Benefit Plan 2021 2020 2019 Pension Plan $ 1,994 $ 2,480 $ 3,103 Health Plan 6,333 7,688 9,949 Other plans 849 929 1,108 Total plan contributions $ 9,176 $ 11,097 $ 14,160

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule Of Ground Lease Arrangements	The table below summarizes our current lease arrangements as of December 31, 2021: Property (1) Year of Current Expiration Year of Final Expiration (2) 625 Madison Avenue 2022 2054 711 Third Avenue (3) 2033 2083 1185 Avenue of the Americas 2043 2043 SL Green Headquarters at One Vanderbilt (4) 2043 2048 420 Lexington Avenue 2050 2080 SUMMIT One Vanderbilt 2058 2070 885 Third Avenue 2080 2080 1080 Amsterdam Avenue (5) 2111 2111 15 Beekman (6)(7) 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. See note 10, "Related Party Transactions." (5) A portion of the lease is classified as a financing lease, which was classified as held for sale as of December 31, 2021. (6) 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. (7) 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	one year as of December 31, 2021 (in thousands): Financing leases Operating leases (1) 2022 $ 3,523 $ 36,776 2023 3,570 48,680 2024 3,641 54,545 2025 3,810 54,772 2026 3,858 54,911 Thereafter 256,691 1,395,533 Total minimum lease payments $ 275,093 $ 1,645,217 Amount representing interest (149,563) — Amount discounted using incremental borrowing rate — (786,280) Total lease liabilities excluding liabilities related to assets held for sale $ 125,530 $ 858,937 Leases reclassified to liabilities related to assets held for sale (22,616) (7,567) Total lease liabilities $ 102,914 $ 851,370
Schedule of future minimum rental payments for opeating leases	one year as of December 31, 2021 (in thousands): Financing leases Operating leases (1) 2022 $ 3,523 $ 36,776 2023 3,570 48,680 2024 3,641 54,545 2025 3,810 54,772 2026 3,858 54,911 Thereafter 256,691 1,395,533 Total minimum lease payments $ 275,093 $ 1,645,217 Amount representing interest (149,563) — Amount discounted using incremental borrowing rate — (786,280) Total lease liabilities excluding liabilities related to assets held for sale $ 125,530 $ 858,937 Leases reclassified to liabilities related to assets held for sale (22,616) (7,567) Total lease liabilities $ 102,914 $ 851,370
Lease, Cost	The following table provides lease cost information for the Company's operating leases for the twelve months ended December 31, 2021 and 2020 (in thousands): Twelve Months Ended December 31, Operating Lease Costs 2021 2020 Operating lease costs before capitalized operating lease costs $ 30,270 $ 32,169 Operating lease costs capitalized (3,716) (3,126) Operating lease costs, net (1) $ 26,554 $ 29,043 (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 twelve months ended December 31, 2021 and 2020 (in thousands): Twelve Months Ended December 31, Financing Lease Costs 2021 2020 Interest on financing leases before capitalized interest $ 5,448 $ 8,091 Interest on financing leases capitalized — (2,378) Interest on financing leases, net (1) 5,448 5,713 Amortization of right-of-use assets (2) 660 1,200 Financing lease costs, net $ 6,108 $ 6,913 (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, 2021
Segment Reporting [Abstract]
Schedule of selected results of operations and selected asset information	Selected consolidated results of operations for the years ended December 31, 2021, 2020, and 2019, and selected asset information as of December 31, 2021 and 2020, regarding our operating segments are as follows (in thousands): Real Estate Segment Debt and Preferred Equity Segment Total Company Total revenues Years ended: December 31, 2021 $ 763,651 $ 80,340 $ 843,991 December 31, 2020 932,581 120,163 1,052,744 December 31, 2019 1,043,405 195,590 1,238,995 Net Income Years ended: December 31, 2021 $ 412,393 $ 68,239 $ 480,632 December 31, 2020 354,353 60,405 414,758 December 31, 2019 158,972 132,515 291,487 Total assets As of: December 31, 2021 $ 9,974,140 $ 1,092,489 $ 11,066,629 December 31, 2020 10,579,899 1,127,668 11,707,567

Organization and Basis of Pre_3

Organization and Basis of Presentation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021
SLG Management LLC | SL Green Management
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	100.00%
Service Corporation
Organization
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)	95.00%

Organization and Basis of Pre_4

Organization and Basis of Presentation - Schedule of Commercial Office Properties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)ft²buildingshares	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Real estate properties
Number of Buildings | building	59
Approximate Square Feet | ft²	27,716,872
Weighted Average Occupancy unaudited (as a percent)	91.60%
Debt and preferred equity investments including investments held by unconsolidated joint ventures | $	$ 1,088,723	$ 1,076,542	$ 1,580,306
Number of shares to be received on redemption of one unit of limited partnership interests (shares) | shares	1
Commercial properties
Real estate properties
Number of Buildings | building	52
Approximate Square Feet | ft²	27,188,688
Weighted Average Occupancy unaudited (as a percent)	91.50%
Managed office properties
Real estate properties
Number of Buildings | building	2
Approximate Square Feet | ft²	2,100,000
Debt and preferred equity investments including investments held by unconsolidated joint ventures | $	$ 1,100,000
Debt and preferred equity investments and other financing receivables included in other balance sheet items | $	$ 10,100
Consolidated properties
Real estate properties
Number of Buildings | building	31
Approximate Square Feet | ft²	11,689,251
Consolidated properties | Commercial properties
Real estate properties
Number of Buildings | building	30
Approximate Square Feet | ft²	11,607,001
Unconsolidated properties
Real estate properties
Number of Buildings | building	28
Approximate Square Feet | ft²	16,027,621
Unconsolidated properties | Commercial properties
Real estate properties
Number of Buildings | building	22
Approximate Square Feet | ft²	15,581,687
Manhattan
Real estate properties
Number of Buildings | building	45
Approximate Square Feet | ft²	26,325,888
Weighted Average Occupancy unaudited (as a percent)	92.00%
Manhattan | Office
Real estate properties
Number of Buildings | building	22
Approximate Square Feet | ft²	20,184,528
Weighted Average Occupancy unaudited (as a percent)	92.10%
Manhattan | Retail
Real estate properties
Number of Buildings | building	11
Approximate Square Feet | ft²	319,884
Weighted Average Occupancy unaudited (as a percent)	91.20%
Manhattan | Development/Redevelopment
Real estate properties
Number of Buildings | building	11
Approximate Square Feet | ft²	5,813,792
Manhattan | Fee Interest
Real estate properties
Number of Buildings | building	1
Approximate Square Feet | ft²	7,684
Manhattan | Residential
Real estate properties
Number of Buildings | building	7
Approximate Square Feet | ft²	528,184
Weighted Average Occupancy unaudited (as a percent)	97.00%
Manhattan | Consolidated properties
Real estate properties
Number of Buildings | building	23
Approximate Square Feet | ft²	10,744,201
Manhattan | Consolidated properties | Office
Real estate properties
Number of Buildings | building	12
Approximate Square Feet | ft²	8,180,345
Manhattan | Consolidated properties | Retail
Real estate properties
Number of Buildings | building	2
Approximate Square Feet | ft²	17,888
Manhattan | Consolidated properties | Development/Redevelopment
Real estate properties
Number of Buildings | building	8
Approximate Square Feet | ft²	2,538,284
Manhattan | Consolidated properties | Fee Interest
Real estate properties
Number of Buildings | building	1
Approximate Square Feet | ft²	7,684
Manhattan | Consolidated properties | Residential
Real estate properties
Number of Buildings | building	1
Approximate Square Feet | ft²	82,250
Manhattan | Unconsolidated properties
Real estate properties
Number of Buildings | building	22
Approximate Square Feet | ft²	15,581,687
Manhattan | Unconsolidated properties | Office
Real estate properties
Number of Buildings | building	10
Approximate Square Feet | ft²	12,004,183
Manhattan | Unconsolidated properties | Retail
Real estate properties
Number of Buildings | building	9
Approximate Square Feet | ft²	301,996
Manhattan | Unconsolidated properties | Development/Redevelopment
Real estate properties
Number of Buildings | building	3
Approximate Square Feet | ft²	3,275,508
Manhattan | Unconsolidated properties | Fee Interest
Real estate properties
Number of Buildings | building	0
Approximate Square Feet | ft²	0
Manhattan | Unconsolidated properties | Residential
Real estate properties
Number of Buildings | building	6
Approximate Square Feet | ft²	445,934
Suburban | Office
Real estate properties
Number of Buildings | building	7
Approximate Square Feet | ft²	862,800
Weighted Average Occupancy unaudited (as a percent)	78.90%
Suburban | Consolidated properties | Office
Real estate properties
Number of Buildings | building	7
Approximate Square Feet | ft²	862,800
Suburban | Unconsolidated properties | Office
Real estate properties
Number of Buildings | building	0
Approximate Square Feet | ft²	0

Organization and Basis of Pre_5

Organization and Basis of Presentation - Subsequent Event (Details)	Jan. 18, 2022	Jan. 10, 2022	Dec. 02, 2021$ / shares	Dec. 31, 2021$ / shares	Dec. 31, 2020$ / shares	Dec. 31, 2019$ / shares	Dec. 31, 2021$ / shares	Dec. 31, 2020$ / shares	Dec. 31, 2019$ / shares
Subsequent Event [Line Items]
Cash distribution declared, per common share (in dollars per share)				$ 0.3203	$ 0.3217	$ 0.9387	$ 6.2729	$ 4.9374	$ 3.6434
Ordinary Dividend
Subsequent Event [Line Items]
Cash distribution declared, per common share (in dollars per share)			$ 0.3108
Special Dividend
Subsequent Event [Line Items]
Cash distribution declared, per common share (in dollars per share)			$ 2.4392
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Reverse stock split conversion ratio	1.03060	1.03060

Significant Accounting Polici_4

Significant Accounting Policies - Investments in Commercial Real Estate Properties (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Line Items]
Weighted average amortization period, above-market lease costs	5 years 1 month 6 days
Weighted average amortization period, below-market lease costs	14 years 3 months 18 days
Weighted average amortization period, in-place lease costs	3 years 9 months 18 days
Period from cessation of major construction activity to completion of construction project, maximum	1 year
Depreciation expense (including amortization of the capital lease asset)	$ 187,300,000	$ 277,500,000	$ 233,500,000
Amortization of above and below Market Leases	4,200,000	5,900,000	$ 4,500,000
Identified intangible assets (included in other assets):
Gross amount	199,722,000	215,673,000
Accumulated amortization	(182,643,000)	(190,523,000)
Net	17,079,000	25,150,000
Identified intangible liabilities (included in deferred revenue):
Gross amount	212,767,000	241,409,000
Accumulated amortization	(210,262,000)	(230,479,000)
Net	2,505,000	10,930,000
Net intangible assets reclassed to assets held for sale	1,800,000	0
Net intangible liabilities reclassed to liabilities relates to assets held for sale	0	$ 0
Other Identifiable Assets
Estimated annual amortization
2022	5,575,000
2023	5,409,000
2024	3,544,000
2025	2,027,000
2026	1,850,000
Acquired above-market leases, net of acquired below-market leases
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
2022	505,000
2023	476,000
2024	56,000
2025	234,000
2026	$ 205,000
Minimum | Above Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | Below Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Minimum | In Place Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	1 year
Maximum | Above Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | Below Market Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
Maximum | In Place Leases
Real Estate [Line Items]
Estimated useful life of other intangible assets (in years)	15 years
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 | Minimum
Real Estate [Line Items]
Estimated useful life (in years)	4 years
Furniture and fixtures | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	7 years
Building | Minimum
Real Estate [Line Items]
Estimated useful life (in years)	3 years
Building | Maximum
Real Estate [Line Items]
Estimated useful life (in years)	40 years

Significant Accounting Polici_5

Significant Accounting Policies - Investment in Marketable Securities (Details)	12 Months Ended
	Dec. 31, 2021USD ($)security	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Investment in Marketable Securities
Marketable securities available-for-sale	$ 24,146,000	$ 28,570,000
Investments in marketable securities	34,752,000	28,570,000
Marketable securities, unrealized gain	600,000
Proceeds from sale of marketable securities	4,500,000	0	$ 0
Proceeds from sale of equity marketable securities	$ 0
Number of marketable securities sold | security	1
Fair Value
Investment in Marketable Securities
Marketable securities available-for-sale	$ 24,146,000	28,570,000
Investments in marketable securities	34,752,000	28,570,000
Commercial mortgage-backed securities
Investment in Marketable Securities
Marketable securities available-for-sale	24,146,000	28,570,000
Cost basis of commercial mortgage backed securities	$ 23,000,000	27,500,000
Number of securities in continuous unrealized loss position | security	1
Unrealized loss	$ 600,000	700,000
Fair value of security in a continuous unrealized loss position for less than 12 months	7,200,000	7,000,000
Equity marketable securities
Investment in Marketable Securities
Investments in marketable securities	$ 10,606,000	$ 0

Significant Accounting Polici_6

Significant Accounting Policies - Investments in Unconsolidated Joint Ventures/Deferred Lease Costs/Revenue Recognition/Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Lease Costs [Abstract]
Portion of compensation capitalized	$ 6.2	$ 5.4	$ 6.3
Estimated average lease term (in years)	7 years
Days past due for income recognition on debt and preferred equity investments to be suspended	90 days
Income taxes
Federal, state and local tax provision	$ 2.8	$ 1.2	$ 1.5
Dividends per share paid (in dollars per share)	$ 8.09	$ 5.54	$ 3.40
Ordinary Income Dividend
Income taxes
Dividends per share paid (in dollars per share)	0.50	1.84	2.59
Capital Gains Dividend
Income taxes
Dividends per share paid (in dollars per share)	$ 5.92	$ 3.06	$ 0.81

Significant Accounting Polici_7

Significant Accounting Policies - Concentrations of Credit Risk/Reclassification (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)agreementtenant	Dec. 31, 2020USD ($)	Dec. 31, 2019	Jan. 01, 2020USD ($)
Concentration of Credit Risk
Retained earnings	$ 975,781	$ 1,015,462
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Concentration of Credit Risk
Retained earnings				$ 39,200
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)	5.00%
Annualized rent | 11 Madison Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	10.80%	8.20%	7.40%
Annualized rent | 420 Lexington Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	8.30%	7.50%	6.60%
Annualized rent | 1515 Broadway | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	8.10%	6.60%	6.10%
Annualized rent | 1185 Avenue of the Americas | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	8.00%	6.90%	7.60%
Annualized rent | 280 Park Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	6.70%	5.40%
Annualized rent | 919 Third Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.30%
Annualized rent | 485 Lexington Avenue | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.30%
Annualized rent | 555 W. 57th Street | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	5.20%
Annualized rent | One Madison Ave | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)			6.00%
Annualized rent | 220 East 42nd Street | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)		5.90%	5.50%
Collective bargaining arrangements | Workforce concentration
Concentration of Credit Risk
Percentage of concentration (percent)	62.80%
Number of collective bargaining agreements | agreement	5
Tenant 1 | Annualized rent | Customer concentration
Concentration of Credit Risk
Percentage of concentration (percent)	6.30%

Property Acquisitions - 2021 Ac

Property Acquisitions - 2021 Acquisitions (Details) $ in Millions	Dec. 31, 2021ft²	Sep. 30, 2021USD ($)ft²	Jun. 30, 2021USD ($)ft²	Jan. 31, 2021USD ($)ft²
Business Acquisition [Line Items]
Approximate Square Feet	27,716,872
885 Third Avenue
Business Acquisition [Line Items]
Approximate Square Feet				625,000
Gross Asset Valuation (in millions) | $				$ 387.9
461 Fifth Avenue
Business Acquisition [Line Items]
Approximate Square Feet			200,000
Gross Asset Valuation (in millions) | $			$ 28
1591-1597 Broadway (Crowne Plaza)
Business Acquisition [Line Items]
Approximate Square Feet		7,684
Gross Asset Valuation (in millions) | $		$ 121
690 Madison Avenue
Business Acquisition [Line Items]
Approximate Square Feet		7,848
Gross Asset Valuation (in millions) | $		$ 72.2

Property Acquisitions - 2020 Ac

Property Acquisitions - 2020 Acquisitions (Details) $ in Millions	1 Months Ended
	Jan. 31, 2020	Dec. 31, 2021ft²	Dec. 31, 2020USD ($)ft²
Business Acquisition [Line Items]
Approximate Square Feet		27,716,872
762 Madison Avenue
Business Acquisition [Line Items]
Approximate Square Feet			6,109
Gross Asset Valuation (in millions) | $			$ 29.3
Interest acquired	10.00%
707 Eleventh Avenue
Business Acquisition [Line Items]
Approximate Square Feet			159,720
Gross Asset Valuation (in millions) | $			$ 90
15 Beekman
Business Acquisition [Line Items]
Approximate Square Feet			98,412
Gross Asset Valuation (in millions) | $			$ 0
590 Fifth Avenue
Business Acquisition [Line Items]
Approximate Square Feet			103,300
Gross Asset Valuation (in millions) | $			$ 107.2
126-132 Nassau Street
Business Acquisition [Line Items]
Ground leases, term of contract	99 years

Property Acquisitions - 2019 Ac

Property Acquisitions - 2019 Acquisitions (Details) $ in Millions	1 Months Ended
	May 31, 2019USD ($)	Dec. 31, 2021ft²	Dec. 31, 2019USD ($)ft²
Business Acquisition [Line Items]
Approximate Square Feet | ft²		27,716,872
106 Spring Street
Business Acquisition [Line Items]
Approximate Square Feet | ft²			5,928
Gross Asset Valuation (in millions)			$ 80.2
410 Tenth Avenue
Business Acquisition [Line Items]
Approximate Square Feet | ft²			638,000
Gross Asset Valuation (in millions)			$ 440
Interest acquired	70.87%
Fair value adjustment	$ 67.6
Net intangible lease liabilities recognized	$ 18.3
110 Greene Street
Business Acquisition [Line Items]
Approximate Square Feet | ft²			223,600
Gross Asset Valuation (in millions)			$ 256.5
Interest acquired	10.00%

Properties Held for Sale and _3

Properties Held for Sale and Property Dispositions (Details) $ in Thousands	1 Months Ended												12 Months Ended
	Jul. 31, 2021USD ($)ft²	Jun. 30, 2021USD ($)ft²	Mar. 31, 2021USD ($)ft²	Feb. 28, 2021USD ($)ft²	Jan. 31, 2021USD ($)ft²	Dec. 31, 2020USD ($)ft²	Sep. 30, 2020USD ($)ft²	May 31, 2020USD ($)ft²	Mar. 30, 2020USD ($)	Dec. 31, 2019USD ($)ft²	Nov. 30, 2019USD ($)ft²	Aug. 31, 2019USD ($)ft²	Dec. 31, 2021USD ($)ft²	Dec. 31, 2020USD ($)ft²	Dec. 31, 2019USD ($)ft²	Mar. 31, 2020USD ($)ft²
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²													27,716,872
Employee-related liabilities						$ 0				$ 4,000			$ 1,400	$ 0	$ 4,000
Purchase price and other fair value adjustments													210,070	$ 187,522	$ 69,389
220 East 42nd Street | 220 East 42nd Street
Property Dispositions and Assets Held for Sale
Ownership percentage deconsolidated	51.00%
Investment fair value adjustment													206,800
1080 Amsterdam Avenue
Property Dispositions and Assets Held for Sale
Sales price													42,500
707 Eleventh Avenue
Property Dispositions and Assets Held for Sale
Charge in connection with classification to assets held for sale													15,000
Sales price													95,000
110 East 42nd Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²					215,400
Sales price					$ 117,100
Gain on Sale					$ 3,600
590 Fifth Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²					103,300
Sales price					$ 103,000
Gain on Sale					$ (3,200)
220 East 42nd Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²	1,135,000
Sales price	$ 783,500
Gain on Sale	$ 175,100
Ownership interest disposed	49.00%
635-641 Sixth Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²		267,000
Sales price		$ 325,000
Gain on Sale		$ 99,400
106 Spring Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²			5,928
Sales price			$ 35,000
Gain on Sale			$ (2,800)
133 Greene Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²				6,425
Sales price				$ 15,800
Gain on Sale				$ 200
712 Madison Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²					6,600
Sales price					$ 43,000
Gain on Sale					$ (1,400)
30 East 40th Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²						69,446								69,446
Sales price						$ 5,200								$ 5,200
Gain on Sale						$ (1,600)
1055 Washington Boulevard
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²						182,000								182,000
Sales price						$ 23,800								$ 23,800
Gain on Sale						$ (11,500)
Williamsburg Terrace
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²						52,000								52,000
Sales price						$ 32,000								$ 32,000
Gain on Sale						$ 11,800
410 Tenth Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²						638,000								638,000
Sales price						$ 952,500								$ 952,500
Gain on Sale						56,400
400 East 58th Street
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²							140,000
Sales price							$ 62,000
Gain on Sale							$ 8,300
609 Fifth Avenue - Retail Condominium
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²								21,437
Sales price								$ 168,000
Gain on Sale								$ 63,300
315 West 33rd Street - The Olivia
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²																492,987
Sales price																$ 446,500
Gain on Sale									$ 71,800
Suburban Properties
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²										1,107,000					1,107,000
Sales price										$ 229,200					$ 229,200
Gain on Sale										$ 1,800
1640 Flatbush Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²										1,000					1,000
Sales price										$ 16,200					$ 16,200
Gain on Sale										$ 5,500
562 Fifth Avenue
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²										42,635					42,635
Sales price										$ 52,400					$ 52,400
Gain on Sale										(26,600)
1010 Washington Boulevard (7)
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²											143,400
Sales price											$ 23,100
Gain on Sale											$ (7,100)
Impairment charge															7,100
Spring Street 115
Property Dispositions and Assets Held for Sale
Unaudited Approximate Usable Square Feet | ft²												5,218
Sales price												$ 66,600
Gain on Sale												$ 3,600
Ownership percentage in disposed asset												49.00%
Deconsolidation of ownership interest percentage												51.00%
Purchase price and other fair value adjustments												$ 3,800
Properties Sold In 2021, 2020 And 2019
Property Dispositions and Assets Held for Sale
Employee-related liabilities						$ 10,500				$ 2,000			$ 13,700	$ 10,500	$ 2,000

Debt and Preferred Equity Inv_3

Debt and Preferred Equity Investments - Roll Forward of Net Book Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of period	$ 1,076,542	$ 1,580,306
Redemptions/sales/syndications/equity ownership/amortization	(201,446)	(1,048,643)
Net change in loan loss reserves	6,583	(11,463)
Balance at end of period	1,088,723	1,076,542
Debt investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/fundings/accretion	193,824	389,300
Preferred equity investments
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Originations/fundings/accretion	$ 13,220	$ 167,042

Debt and Preferred Equity Inv_4

Debt and Preferred Equity Investments - Debt and Preferred Equity Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying value	$ 1,088,723	$ 1,076,542
Senior Financing	6,626,950
Senior Mortgage Debt
Debt Instrument [Line Items]
Carrying value	95,646
Senior Financing	0
Mezzanine Debt
Debt Instrument [Line Items]
Carrying value	720,071
Senior Financing	4,664,200
Preferred Equity
Debt Instrument [Line Items]
Carrying value	273,006
Senior Financing	1,962,750
Total floating rate
Debt Instrument [Line Items]
Carrying value	294,970
Face Value	296,115
Total floating rate | Senior Mortgage Debt
Debt Instrument [Line Items]
Carrying value	22,646
Face Value	22,841
Total floating rate | Mezzanine Debt
Debt Instrument [Line Items]
Carrying value	272,324
Face Value	273,274
Total floating rate | Preferred Equity
Debt Instrument [Line Items]
Carrying value	0
Face Value	$ 0
Total floating rate | LIBOR | Minimum | Senior Mortgage Debt
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
Total floating rate | LIBOR | Minimum | Mezzanine Debt
Debt Instrument [Line Items]
Basis spread on variable rate	5.00%
Total floating rate | LIBOR | Maximum | Senior Mortgage Debt
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
Total floating rate | LIBOR | Maximum | Mezzanine Debt
Debt Instrument [Line Items]
Basis spread on variable rate	12.57%
Total fixed rate
Debt Instrument [Line Items]
Carrying value	$ 793,753
Face Value	804,295
Total fixed rate | Senior Mortgage Debt
Debt Instrument [Line Items]
Carrying value	73,000
Face Value	$ 73,000
Interest rate	3.00%
Total fixed rate | Mezzanine Debt
Debt Instrument [Line Items]
Carrying value	$ 447,747
Face Value	457,474
Total fixed rate | Preferred Equity
Debt Instrument [Line Items]
Carrying value	273,006
Face Value	$ 273,821
Total fixed rate | Minimum | Mezzanine Debt
Debt Instrument [Line Items]
Interest rate	2.90%
Total fixed rate | Minimum | Preferred Equity
Debt Instrument [Line Items]
Interest rate	6.50%
Total fixed rate | Maximum | Mezzanine Debt
Debt Instrument [Line Items]
Interest rate	14.30%
Total fixed rate | Maximum | Preferred Equity
Debt Instrument [Line Items]
Interest rate	11.00%

Debt and Preferred Equity Inv_5

Debt and Preferred Equity Investments - Rollforward of Total Allowance for Loan Loss Reserves (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2021USD ($)loan	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Loan loss reserve activity
Balance at beginning of year		$ 13,213	$ 1,750	$ 5,750
Current period provision for loan loss		0	20,693	0
Write-offs charged against allowance		(6,583)	(37,033)	(4,000)
Balance at end of year	$ 13,213	6,630	13,213	1,750
Write-offs charged against allowance		$ 6,583	37,033	4,000
Number of financing receivables on non-accrual without allowance for loan loss | loan		1
Financing receivable on non-accrual without allowance		$ 225,400
Investments Sold In 2021
Loan loss reserve activity
Write-offs charged against allowance		0
Write-offs charged against allowance		0
Investments Sold In 2020
Loan loss reserve activity
Write-offs charged against allowance	(19,000)
Write-offs charged against allowance	19,000
Cumulative Effect, Period of Adoption, Adjustment
Loan loss reserve activity
Balance at beginning of year		$ 0	27,803	0
Balance at end of year	$ 0		$ 0	$ 27,803

Debt and Preferred Equity Inv_6

Debt and Preferred Equity Investments - Investment In Financing Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	$ 1,088,723	$ 1,076,542
2020	139,873
2019	284,821
2018	317,753
Prior	346,276
1 - Low Risk Assets - Low probability of loss
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	644,489	695,035
2020	139,873
2019	151,086
2018	57,511
Prior	296,019
2 - Watch List Assets - Higher potential for loss
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	437,344	365,167
2020	0
2019	133,735
2018	260,242
Prior	43,367
3 - High Risk Assets - Loss more likely than not
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying value	6,890	$ 16,340
2020	0
2019	0
2018	0
Prior	$ 6,890

Debt and Preferred Equity Inv_7

Debt and Preferred Equity Investments - Debt Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate, interest rate	6.52%
Debt Investments Held [Abstract]
Carrying value	$ 1,088,723,000	$ 1,076,542,000
Carrying value	1,088,723,000	1,076,542,000
Mezzanine Loan Due June 2023
Debt Investments Held [Abstract]
Loan interest income	0
Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Loan interest income	0
Amount participated out	12,000,000
Mezzanine Loan Due March 2022
Debt Investments Held [Abstract]
Amount participated out	400,000
Debt investment
Debt Investments Held [Abstract]
Future Funding Obligations	75,640,000
Senior Financing	4,664,200,000
Allowance for loan loss	(6,630,000)	(13,213,000)
Carrying value	815,717,000	816,756,000
Total fixed rate
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	2,929,431,000
Carrying value	527,377,000	477,509,000
Total fixed rate | Mezzanine Loan Due August 2022
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	280,000,000
Carrying value	43,521,000	41,057,000
Total fixed rate | Mortgage Loan, Due April 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying value	73,000,000	0
Total fixed rate | Mezzanine Loan Due June 2023
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	376,705,000
Carrying value	225,367,000	225,204,000
Total fixed rate | Mezzanine Loan Due June 2023, 2
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	274,976,000
Carrying value	66,873,000	0
Total fixed rate | Mezzanine Loan Due June 2024
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	105,000,000
Carrying value	13,366,000	13,366,000
Total fixed rate | Mezzanine Loan, with an Initial Maturity Date of January 2025
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	95,000,000
Carrying value	30,000,000	30,000,000
Total fixed rate | Mezzanine Loan with an Initial Maturity Date of June 2027
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	1,712,750,000
Carrying value	55,250,000	55,250,000
Total fixed rate | Mezzanine Loan With Initial Maturity Date of December 2029
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	85,000,000
Carrying value	20,000,000	20,000,000
Total fixed rate | Junior Mortgage Paid Off
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying value	0	32,888,000
Total fixed rate | Mezzanine Loan Paid Off
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying value	0	3,500,000
Total fixed rate | Mortgage/Mezzanine Loan Due October 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying value	0	56,244,000
Total floating rate
Debt Investments Held [Abstract]
Future Funding Obligations	75,640,000
Senior Financing	1,734,769,000
Carrying value	294,970,000	352,460,000
Total floating rate | Mezzanine Loan Due April 2022
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	275,000,000
Carrying value	49,998,000	49,956,000
Total floating rate | Mezzanine Loan Due July 2021, 2
Debt Investments Held [Abstract]
Future Funding Obligations	4,933,000
Senior Financing	180,415,000
Carrying value	37,511,000	35,318,000
Total floating rate | Mezzanine Loan Due March 2022
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	1,115,000,000
Carrying value	133,735,000	127,915,000
Total floating rate | Mortgage/Mezzanine Loan Due May 2022
Debt Investments Held [Abstract]
Future Funding Obligations	3,932,000
Senior Financing	54,000,000
Carrying value	8,050,000	6,858,000
Total floating rate | Mezzanine Loan Due December 2022
Debt Investments Held [Abstract]
Future Funding Obligations	23,360,000
Senior Financing	0
Carrying value	34,874,000	14,011,000
Total floating rate | Mezzanine Loan Due May 2023
Debt Investments Held [Abstract]
Future Funding Obligations	43,415,000
Senior Financing	110,354,000
Carrying value	30,802,000	19,889,000
Total floating rate | Junior Mortgage Participation/Mezzanine Loan Due July 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying value	0	15,733,000
Total floating rate | Mezzanine Loan Due July 2021
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying value	0	29,106,000
Total floating rate | Mortgage Loan Paid Off
Debt Investments Held [Abstract]
Future Funding Obligations	0
Senior Financing	0
Carrying value	$ 0	$ 53,674,000

Debt and Preferred Equity Inv_8

Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Preferred equity investment
Mortgage loans on real estate, interest rate	6.52%
Carrying value	$ 1,088,723	$ 1,076,542
Preferred Equity June 2022
Preferred equity investment
Future Funding Obligations	0
Senior Financing	1,712,750
Carrying value	160,772	154,691
Preferred Equity, February 2027
Preferred equity investment
Future Funding Obligations	0
Senior Financing	250,000
Carrying value	$ 112,234	105,095
Preferred equity investments
Preferred equity investment
Mortgage loans on real estate, interest rate	9.87%
Future Funding Obligations	$ 0
Senior Financing	1,962,750
Carrying value	273,006	259,786
Allowance for loan loss	0	0
Total after allowance for loan loss	$ 273,006	$ 259,786

Debt and Preferred Equity Inv_9

Debt and Preferred Equity Investments - Narrative (Details)	12 Months Ended
	Dec. 31, 2021USD ($)investmentsegment	Dec. 31, 2020USD ($)segmentinvestment	Dec. 31, 2019USD ($)
Preferred equity investment
Number of investments, nonperforming | investment	2	1
Debt and preferred equity investments	$ 1,088,723,000	$ 1,076,542,000
Recorded investment, past due	1,088,723,000	1,076,542,000
Financing receivable, nonaccrual status	$ 27,700,000	$ 27,700,000
Number of portfolio segments of financial receivables (segment) | segment	1	1
Current period provision for loan loss	$ 0	$ 20,693,000	$ 0
Affiliated Entity
Preferred equity investment
Additional amount of financing receivables included in other assets	50,300,000	66,200,000
Current period provision for loan loss	2,900,000	14,600,000
ASC 326
Preferred equity investment
Adjustment upon adoption of ASC 326		11,400,000
3 - High Risk Assets - Loss more likely than not
Preferred equity investment
Recorded investment, past due	6,890,000	16,340,000
Financing Receivables, Equal to Greater than 90 Days Past Due
Preferred equity investment
Recorded investment, past due	0	0
Total floating rate
Preferred equity investment
Debt and preferred equity investments	294,970,000	352,460,000
Mortgage/Mezzanine Loan Due March 2020 | Total floating rate
Preferred equity investment
Debt and preferred equity investments	216,000,000	6,800,000
Preferred equity investments
Preferred equity investment
Debt and preferred equity investments	273,006,000	$ 259,786,000
Preferred equity investments | Preferred equity investments
Preferred equity investment
Debt and preferred equity investments	$ 6,800,000

Investments in Unconsolidated_3

Investments in Unconsolidated Joint Ventures - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2021	Dec. 31, 2021USD ($)ft²partnerunit	Dec. 31, 2021USD ($)ft²partnerunit	Dec. 31, 2020USD ($)	Nov. 30, 2021USD ($)	Jul. 31, 2021USD ($)ft²
General information on each joint venture
Investments in unconsolidated joint ventures | $		$ 2,997,934	$ 2,997,934	$ 3,823,322
Net equity investment in VIEs in which the entity is not primary beneficiary | $		$ 85,600	$ 85,600	134,000
Approximate Square Feet		27,716,872	27,716,872
21 East 66th Street | Three Retail and Two Residential Units
General information on each joint venture
Ownership interest		32.28%	32.28%
Number of stores | unit		3	3
Number of residential units | unit		1	1
21 East 66th Street | Three Residential Units
General information on each joint venture
Ownership interest		16.14%	16.14%
Number of residential units | unit		2	2
Stonehenge Portfolio
General information on each joint venture
Asset impairment loss | $		$ 3,100
Gross asset valuation | $		$ 1,000	$ 1,000
Worldwide Plaza
General information on each joint venture
Ownership percentage acquired	1.20%
Increase in ownership interest	0.60%
One Madison Avenue
General information on each joint venture
Investment in joint venture aggregate equity committed by partner | $				$ 492,200	$ 259,300
Investment in joint venture aggregate maximum ownership percentage				49.50%	25.00%
Investment in joint venture, number of partners | partner		2	2
Investment in joint venture, ownership percentage		27.10%	27.10%
Joint venture
General information on each joint venture
Investments in unconsolidated joint ventures | $		$ 2,997,934	$ 2,997,934
Equity method investments with negative book value | $		$ 103,700	$ 103,700
Joint venture | 100 Park Avenue
General information on each joint venture
Ownership interest		49.90%	49.90%
Economic Interest, percent		49.90%	49.90%
Approximate Square Feet		834,000	834,000
Joint venture | 717 Fifth Avenue
General information on each joint venture
Ownership interest		10.92%	10.92%
Economic Interest, percent		10.92%	10.92%
Approximate Square Feet		119,500	119,500
Joint venture | 800 Third Avenue
General information on each joint venture
Ownership interest		60.52%	60.52%
Economic Interest, percent		60.52%	60.52%
Approximate Square Feet		526,000	526,000
Joint venture | 919 Third Avenue
General information on each joint venture
Ownership interest		51.00%	51.00%
Economic Interest, percent		51.00%	51.00%
Approximate Square Feet		1,454,000	1,454,000
Joint venture | 11 West 34th Street
General information on each joint venture
Ownership interest		30.00%	30.00%
Economic Interest, percent		30.00%	30.00%
Approximate Square Feet		17,150	17,150
Joint venture | 280 Park Avenue
General information on each joint venture
Ownership interest		50.00%	50.00%
Economic Interest, percent		50.00%	50.00%
Approximate Square Feet		1,219,158	1,219,158
Joint venture | 1552-1560 Broadway
General information on each joint venture
Ownership interest		50.00%	50.00%
Economic Interest, percent		50.00%	50.00%
Approximate Square Feet		57,718	57,718
Joint venture | 10 East 53rd Street
General information on each joint venture
Ownership interest		55.00%	55.00%
Economic Interest, percent		55.00%	55.00%
Approximate Square Feet		354,300	354,300
Joint venture | 21 East 66th Street
General information on each joint venture
Ownership interest		32.28%	32.28%
Economic Interest, percent		32.28%	32.28%
Approximate Square Feet		13,069	13,069
Joint venture | 650 Fifth Avenue
General information on each joint venture
Ownership interest		50.00%	50.00%
Economic Interest, percent		50.00%	50.00%
Approximate Square Feet		69,214	69,214
Joint venture | 121 Greene Street
General information on each joint venture
Ownership interest		50.00%	50.00%
Economic Interest, percent		50.00%	50.00%
Approximate Square Feet		7,131	7,131
Joint venture | Stonehenge Portfolio
General information on each joint venture
Approximate Square Feet		1,439,016	1,439,016
Joint venture | 11 Madison Avenue
General information on each joint venture
Ownership interest		60.00%	60.00%
Economic Interest, percent		60.00%	60.00%
Approximate Square Feet		2,314,000	2,314,000
Joint venture | One Vanderbilt Avenue
General information on each joint venture
Ownership interest		71.01%	71.01%
Economic Interest, percent		71.01%	71.01%
Approximate Square Feet		1,657,198	1,657,198
Joint venture | Worldwide Plaza
General information on each joint venture
Ownership interest		24.95%	24.95%
Economic Interest, percent		24.95%	24.95%
Approximate Square Feet		2,048,725	2,048,725
Joint venture | 1515 Broadway
General information on each joint venture
Ownership interest		56.87%	56.87%
Economic Interest, percent		56.87%	56.87%
Approximate Square Feet		1,750,000	1,750,000
Joint venture | 2 Herald Square
General information on each joint venture
Ownership interest		51.00%	51.00%
Economic Interest, percent		51.00%	51.00%
Approximate Square Feet		369,000	369,000
Joint venture | 115 Spring Street
General information on each joint venture
Ownership interest		51.00%	51.00%
Economic Interest, percent		51.00%	51.00%
Approximate Square Feet		5,218	5,218
Joint venture | 15 Beekman
General information on each joint venture
Ownership interest		20.00%	20.00%
Economic Interest, percent		20.00%	20.00%
Approximate Square Feet		221,884	221,884
Joint venture | 85 Fifth Avenue
General information on each joint venture
Ownership interest		36.27%	36.27%
Economic Interest, percent		36.27%	36.27%
Approximate Square Feet		12,946	12,946
Joint venture | One Madison Avenue
General information on each joint venture
Ownership interest		25.50%	25.50%
Economic Interest, percent		25.50%	25.50%
Approximate Square Feet		1,048,700	1,048,700
Joint venture | 220 East 42nd Street
General information on each joint venture
Ownership interest		51.00%	51.00%
Economic Interest, percent		51.00%	51.00%
Approximate Square Feet		1,135,000	1,135,000
One Madison Avenue
General information on each joint venture
Ownership percentage deconsolidated				50.50%
Investment fair value adjustment | $				$ 187,500
220 East 42nd Street | 220 East 42nd Street
General information on each joint venture
Ownership percentage deconsolidated						51.00%
Investment fair value adjustment | $			$ 206,800
220 East 42nd Street
General information on each joint venture
Approximate Square Feet						1,135,000
Gross asset valuation | $						$ 783,500
Ownership interest disposed						49.00%

Investments in Unconsolidated_4

Investments in Unconsolidated Joint Ventures - Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property (Details) $ in Thousands	1 Months Ended								12 Months Ended
	Sep. 30, 2021USD ($)	Jun. 30, 2021USD ($)	Apr. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)retailAsset	May 31, 2019USD ($)	Jan. 31, 2019USD ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)retailAsset
Schedule of Equity Method Investments [Line Items]
Gain (Loss) on Sale									$ (32,757)	$ 2,961	$ 76,181
Employee-related liabilities					$ 0	$ 4,000			$ 1,400	$ 0	$ 4,000
400 East 57th Street
Schedule of Equity Method Investments [Line Items]
Asset impairment loss			$ 5,700
21 East 66th Street
Schedule of Equity Method Investments [Line Items]
Number of residential units sold | retailAsset						1					1
Joint venture | 400 East 57th Street
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold	41.00%
Gross asset valuation	$ 133,500
Gain (Loss) on Sale	$ (1,000)
Joint venture | 605 West 42nd Street - Sky
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold		20.00%
Gross asset valuation		$ 858,100
Gain (Loss) on Sale		$ 8,900
Joint venture | 55 West 46th Street - Tower 46
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold				25.00%
Gross asset valuation				$ 275,000
Gain (Loss) on Sale				$ (15,200)
Joint venture | 333 East 22nd Street
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold					33.33%					33.33%
Gross asset valuation					$ 1,600					$ 1,600
Gain (Loss) on Sale					$ 3,000
Joint venture | 21 East 66th Street
Schedule of Equity Method Investments [Line Items]
Gross asset valuation						$ 2,900					$ 2,900
Gain (Loss) on Sale						300
Joint venture | 521 Fifth Avenue
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold							50.50%
Gross asset valuation							$ 381,000
Gain (Loss) on Sale							$ 57,900
Joint venture | 131-137 Spring Street
Schedule of Equity Method Investments [Line Items]
Ownership Interest Sold								20.00%
Gross asset valuation								$ 216,000
Gain (Loss) on Sale								$ 17,700
Joint venture | Stonehenge Portfolio
Schedule of Equity Method Investments [Line Items]
Gross asset valuation						$ 468,800					468,800
Gain (Loss) on Sale											$ (2,400)

Investments in Unconsolidated_5

Investments in Unconsolidated Joint Ventures - Mortgages and Other Loans Payable (Details)	12 Months Ended
	Dec. 31, 2021USD ($)mortgageextension	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Total fixed rate debt	$ 1,073,409,000	$ 1,083,683,000
Total floating rate debt	361,051,000	917,677,000
Deferred financing costs, net	(5,537,000)	(21,388,000)
220 East 42nd Street
Debt Instrument [Line Items]
Total floating rate debt	0	510,000,000
Joint venture
Debt Instrument [Line Items]
Total fixed rate debt	8,216,666,000	5,604,858,000
Total floating rate debt	2,999,726,000	4,257,792,000
Total fixed rate and floating rate debt	11,216,392,000	9,862,650,000
Deferred financing costs, net	(130,516,000)	(113,446,000)
Total joint venture mortgages and other loans payable, net	$ 11,085,876,000	9,749,204,000
Joint venture | 717 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest, percent	10.92%
Joint venture | 717 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.45%
Total fixed rate debt	$ 300,000,000	300,000,000
Joint venture | 717 Fifth Avenue | Mezzanine loans
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.50%
Total fixed rate debt	$ 355,328,000	355,328,000
Joint venture | 650 Fifth Avenue
Debt Instrument [Line Items]
Economic Interest, percent	50.00%
Joint venture | 650 Fifth Avenue | Mortgage loan
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	4.46%
Total fixed rate debt	$ 210,000,000	210,000,000
Joint venture | 650 Fifth Avenue | Mezzanine loans
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	5.45%
Total fixed rate debt	$ 65,000,000	65,000,000
Joint venture | 21 East 66th Street
Debt Instrument [Line Items]
Economic Interest, percent	32.28%
Interest rate, fixed rate debt (as a percent)	3.60%
Interest rate, floating rate debt (as a percent)	2.75%
Total fixed rate debt	$ 12,000,000	12,000,000
Total floating rate debt	$ 632,000	677,000
Joint venture | 919 Third Avenue
Debt Instrument [Line Items]
Economic Interest, percent	51.00%
Interest rate, fixed rate debt (as a percent)	5.12%
Total fixed rate debt	$ 500,000,000	500,000,000
Joint venture | 1515 Broadway
Debt Instrument [Line Items]
Economic Interest, percent	56.87%
Interest rate, fixed rate debt (as a percent)	3.93%
Total fixed rate debt	$ 801,845,000	820,607,000
Joint venture | 11 Madison Avenue
Debt Instrument [Line Items]
Economic Interest, percent	60.00%
Interest rate, fixed rate debt (as a percent)	3.84%
Total fixed rate debt	$ 1,400,000,000	1,400,000,000
Joint venture | 800 Third Avenue
Debt Instrument [Line Items]
Economic Interest, percent	60.52%
Interest rate, fixed rate debt (as a percent)	3.37%
Total fixed rate debt	$ 177,000,000	177,000,000
Joint venture | Worldwide Plaza
Debt Instrument [Line Items]
Economic Interest, percent	24.95%
Interest rate, fixed rate debt (as a percent)	3.98%
Total fixed rate debt	$ 1,200,000,000	1,200,000,000
Joint venture | One Vanderbilt Avenue
Debt Instrument [Line Items]
Economic Interest, percent	71.01%
Interest rate, fixed rate debt (as a percent)	2.95%
Interest rate, floating rate debt (as a percent)
Total fixed rate debt	$ 3,000,000,000	0
Total floating rate debt	$ 0	1,210,329,000
Joint venture | Stonehenge Portfolio
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)	3.50%
Total fixed rate debt	$ 195,493,000	195,899,000
Joint venture | Stonehenge Portfolio | Secured Debt, Initial Maturity April 2028
Debt Instrument [Line Items]
Total fixed rate debt	$ 132,200,000
Number of mortgages | mortgage	3
Joint venture | Stonehenge Portfolio | Secured Debt, Initial Maturity July 2029
Debt Instrument [Line Items]
Total fixed rate debt	$ 63,300,000
Number of mortgages | mortgage	2
Joint venture | 400 East 57th Street
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)
Total fixed rate debt	$ 0	97,024,000
Joint venture | 885 Third Avenue | Mortgage loan
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)
Total fixed rate debt	$ 0	272,000,000
Joint venture | 1552 Broadway
Debt Instrument [Line Items]
Economic Interest, percent	50.00%
Interest rate, floating rate debt (as a percent)	2.65%
Total floating rate debt	$ 193,132,000	195,000,000
Joint venture | 280 Park Avenue
Debt Instrument [Line Items]
Economic Interest, percent	50.00%
Interest rate, floating rate debt (as a percent)	1.73%
Total floating rate debt	$ 1,200,000,000	1,200,000,000
Joint venture | 121 Greene Street
Debt Instrument [Line Items]
Economic Interest, percent	50.00%
Interest rate, floating rate debt (as a percent)	2.00%
Total floating rate debt	$ 13,228,000	15,000,000
Joint venture | 2 Herald Square
Debt Instrument [Line Items]
Economic Interest, percent	51.00%
Interest rate, floating rate debt (as a percent)	1.95%
Total floating rate debt	$ 200,989,000	214,500,000
Joint venture | 11 West 34th Street
Debt Instrument [Line Items]
Economic Interest, percent	30.00%
Interest rate, floating rate debt (as a percent)	1.45%
Total floating rate debt	$ 23,000,000	23,000,000
Joint venture | 220 East 42nd Street
Debt Instrument [Line Items]
Economic Interest, percent	51.00%
Interest rate, floating rate debt (as a percent)	2.75%
Total floating rate debt	$ 510,000,000	0
Joint venture | 115 Spring Street
Debt Instrument [Line Items]
Economic Interest, percent	51.00%
Interest rate, floating rate debt (as a percent)	3.40%
Total floating rate debt	$ 65,550,000	65,550,000
Joint venture | 100 Park Avenue
Debt Instrument [Line Items]
Economic Interest, percent	49.90%
Interest rate, floating rate debt (as a percent)	2.25%
Total floating rate debt	$ 360,000,000	360,000,000
Joint venture | 15 Beekman
Debt Instrument [Line Items]
Economic Interest, percent	20.00%
Interest rate, floating rate debt (as a percent)	1.50%
Total floating rate debt	$ 43,566,000	11,212,000
Joint venture | 15 Beekman | Construction Loans
Debt Instrument [Line Items]
Maximum facility capacity	$ 125,000,000
Joint venture | 10 East 53rd Street
Debt Instrument [Line Items]
Economic Interest, percent	55.00%
Interest rate, floating rate debt (as a percent)	1.35%
Total floating rate debt	$ 220,000,000	220,000,000
Joint venture | One Madison Avenue
Debt Instrument [Line Items]
Economic Interest, percent	25.50%
Interest rate, floating rate debt (as a percent)	3.35%
Total floating rate debt	$ 169,629,000	0
Joint venture | One Madison Avenue | Construction Loans
Debt Instrument [Line Items]
Period of extension option	1 year
Maximum facility capacity	$ 1,250,000,000
Term (in Years)	5 years
Number of extension options | extension	1
Joint venture | 605 West 42nd Street - Sky
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)
Total floating rate debt	$ 0	550,000,000
Joint venture | West 46th Street 55
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)
Total floating rate debt	$ 0	$ 192,524,000

Investments in Unconsolidated_6

Investments in Unconsolidated Joint Ventures - Schedules of Combined Financial Statements for the Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Commercial real estate property, net		$ 5,754,708	$ 5,399,002
Cash and restricted cash		251,417	266,059	$ 166,070
Tenant and other receivables, related party receivables, and deferred rents receivable		47,616	44,507
Debt and preferred equity investments		1,088,723	1,076,542
Other assets		262,841	448,213
Total assets	[1]	11,066,629	11,707,567
Liabilities and equity
Mortgages and other loans payable, net		1,394,386	1,979,972
Lease liabilities		851,370	339,458
Other liabilities		195,390	302,798
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		4,778,253	4,935,795	5,517,198	$ 5,947,855
Total liabilities and equity/capital		11,066,629	11,707,567
Company's investments in unconsolidated joint ventures		2,997,934	3,823,322
Investments difference between carrying amount and underlying equity		544,400
Combined statements of income for the unconsolidated joint ventures
Total revenues		843,991	1,052,744	1,238,995
Real estate taxes		152,835	176,315	190,764
Interest expense before capitalized interest		145,197	185,934	246,848
Amortization of deferred financing costs		11,424	11,794	11,653
Depreciation and amortization		216,869	313,668	272,358
Total expenses		747,342	958,326	1,034,764
Net income		480,632	414,758	291,487
Company's equity in net (loss) income from unconsolidated joint ventures		(55,402)	(25,195)	(34,518)
Joint venture
Assets
Commercial real estate property, net		14,763,874	16,143,880
Cash and restricted cash		768,510	357,076
Tenant and other receivables, related party receivables, and deferred rents receivable		533,455	403,883
Other assets		1,776,030	2,001,612
Total assets		17,841,869	18,906,451
Liabilities and equity
Mortgages and other loans payable, net		11,085,876	9,749,204
Deferred revenue		1,158,242	1,341,571
Lease liabilities		980,595	1,002,563
Other liabilities		352,499	464,107
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		4,264,657	6,349,006
Total liabilities and equity/capital		17,841,869	18,906,451
Company's investments in unconsolidated joint ventures		2,997,934
Combined statements of income for the unconsolidated joint ventures
Total revenues		1,228,364	1,133,217	1,163,534
Operating expenses		203,332	180,201	202,881
Real estate taxes		225,104	220,633	212,355
Operating lease, rent		22,576	24,134	24,816
Interest expense before capitalized interest		342,910	325,500	372,408
Amortization of deferred financing costs		31,423	20,427	19,336
Depreciation and amortization		484,130	407,834	407,697
Total expenses		1,309,475	1,178,729	1,239,493
Loss on early extinguishment of debt		(2,017)	(194)	(1,031)
Net income		(83,128)	(45,706)	(76,990)
Company's equity in net (loss) income from unconsolidated joint ventures		(55,402)	(25,195)	(34,518)
Management Service, Base | Joint venture
Investment in Unconsolidated Joint Ventures
Management fees, base revenue		$ 19,600	$ 15,800	$ 13,000
[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: $193.4 million and $41.2 million of land, $336.9 million and $57.9 million of building and improvements, $— million and $2.0 million of building and leasehold improvements, $15.4 million and $37.8 million of right of use assets, $11.7 million and $10.3 million of accumulated depreciation, $574.4 million and $289.5 million of other assets included in other line items, $418.9 million and $94.0 million of real estate debt, net, $0.8 million and $0.7 million of accrued interest payable, $15.3 million and $29.9 million of lease liabilities, and $145.2 million and $56.6 million of other liabilities included in other line items as of December 31, 2021 and December 31, 2020, respectively.

Deferred Costs (Details)

Deferred Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred leasing costs	$ 400,419	$ 447,002
Less: accumulated amortization	(275,924)	(269,834)
Deferred costs, net	$ 124,495	$ 177,168

Mortgages and Other Loans Pay_3

Mortgages and Other Loans Payable (Details)	1 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2021USD ($)extension	Jul. 31, 2021	Dec. 31, 2020USD ($)	Apr. 30, 2018USD ($)	Mar. 31, 2018USD ($)
Debt Instrument [Line Items]
Total fixed rate debt		$ 1,073,409,000		$ 1,083,683,000
Total floating rate debt		361,051,000		917,677,000
Total fixed rate and floating rate debt		1,434,460,000		2,001,360,000
Mortgages reclassed to liabilities related to assets held for sale		(34,537,000)		0
Total mortgages and other loans payable		1,399,923,000		2,001,360,000
Deferred financing costs, net of amortization		(5,537,000)		(21,388,000)
Total mortgages and other loans payable		1,394,386,000		1,979,972,000
Book value of collateral		2,100,000,000		2,500,000,000
Outstanding under line of credit facility		381,334,000		105,262,000
FHLB Facility, January 2021, 1
Debt Instrument [Line Items]
Total floating rate debt		0		10,000,000
FHLB Facility, January 2021, 2
Debt Instrument [Line Items]
Total floating rate debt		0		15,000,000
FHLB Facility January 2021
Debt Instrument [Line Items]
Total floating rate debt		0		35,000,000
2017 Master Repurchase Agreement 2017
Debt Instrument [Line Items]
Total floating rate debt		0		0
Maximum facility capacity		400,000,000			$ 400,000,000	$ 300,000,000
Extension option exercised, term	1 year
Outstanding under line of credit facility		0
100 Church Street
Debt Instrument [Line Items]
Total fixed rate debt		$ 200,212,000		204,875,000
100 Church Street | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.68%
420 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 288,660,000		294,035,000
420 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.99%
Landmark Square
Debt Instrument [Line Items]
Total fixed rate debt		$ 100,000,000		100,000,000
Landmark Square | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.90%
485 Lexington Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 450,000,000		450,000,000
485 Lexington Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		4.25%
1080 Amsterdam Avenue
Debt Instrument [Line Items]
Total fixed rate debt		$ 34,537,000		34,773,000
Total fixed rate debt		33,600,000
Subordinate loan		$ 900,000
1080 Amsterdam Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		3.59%
Term (in Years)		5 years
1080 Amsterdam Avenue | Mortgage loan | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		350.00%
1080 Amsterdam Avenue | Senior Subordinated Loans | Weighted Average
Debt Instrument [Line Items]
Interest rate, fixed rate debt (as a percent)		700.00%
609 Fifth Avenue - Retail Condominium
Debt Instrument [Line Items]
Total floating rate debt		$ 52,882,000		57,651,000
609 Fifth Avenue - Retail Condominium | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.95%
185 Broadway
Debt Instrument [Line Items]
Total floating rate debt		$ 198,169,000		158,478,000
185 Broadway | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		2.85%
719 Seventh Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 50,000,000		50,000,000
719 Seventh Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		1.20%
690 Madison Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 60,000,000		0
690 Madison Avenue | Weighted Average
Debt Instrument [Line Items]
Interest rate, floating rate debt (as a percent)		1.60%
220 East 42nd Street
Debt Instrument [Line Items]
Total floating rate debt		$ 0		510,000,000
133 Greene Street
Debt Instrument [Line Items]
Total floating rate debt		0		15,523,000
106 Spring Street
Debt Instrument [Line Items]
Total floating rate debt		0		38,025,000
712 Madison Avenue
Debt Instrument [Line Items]
Total floating rate debt		$ 0		$ 28,000,000
Construction Loans | 185 Broadway
Debt Instrument [Line Items]
Term (in Years)		3 years
Maximum facility capacity		$ 225,000,000
Number of extension options | extension		2
Period of extension option		1 year
220 East 42nd Street
Debt Instrument [Line Items]
Ownership interest disposed			49.00%

Corporate Indebtedness - Additi

Corporate Indebtedness - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021USD ($)extension	Dec. 31, 2020USD ($)
Corporate Indebtedness
Outstanding under line of credit facility	$ 381,334,000	$ 105,262,000
Long-term debt	$ 1,394,386,000	1,979,972,000
Revolving credit facility
Corporate Indebtedness
Facility fee (as a percent)	20.00%
Outstanding under line of credit facility	$ 390,000,000
Revolving credit facility | Minimum
Corporate Indebtedness
Facility fee (as a percent)	12.50%
Revolving credit facility | Maximum
Corporate Indebtedness
Facility fee (as a percent)	30.00%
2012 Credit Facility
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,250,000,000
Letters of credit	2,000,000
Ability to borrow under line of credit facility	860,000,000
Line of Credit | Term loan
Corporate Indebtedness
Long-term debt	1,200,000,000	1,500,000,000
Line of Credit | 2012 Credit Facility
Corporate Indebtedness
Long-term debt	381,300,000	$ 105,300,000
Term loan | Term Loan A, Maturity March 31, 2023
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 1,050,000,000
Term loan | Term Loan A, Maturity March 31, 2023 | SOFR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	95.00%
Term loan | Term Loan A, Maturity March 31, 2023 | SOFR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	80.00%
Term loan | Term Loan A, Maturity March 31, 2023 | SOFR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	160.00%
Term loan | Term Loan B, Maturity November 21, 2024
Corporate Indebtedness
Credit facility, maximum borrowing capacity	$ 200,000,000
Term loan | Term Loan B, Maturity November 21, 2024 | SOFR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	100.00%
Term loan | Term Loan B, Maturity November 21, 2024 | SOFR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	85.00%
Term loan | Term Loan B, Maturity November 21, 2024 | SOFR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	165.00%
Revolving credit facility | Line of Credit | SOFR
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
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | SOFR
Corporate Indebtedness
Interest rate added to base rate (as a percent)	85.00%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | SOFR | Minimum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	72.50%
Revolving credit facility | Line of Credit | Revolving Credit Facility, Maturity March 31, 2022 | SOFR | Maximum
Corporate Indebtedness
Interest rate added to base rate (as a percent)	140.00%

Corporate Indebtedness - Senior

Corporate Indebtedness - Senior Unsecured Notes (Details) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2017	Dec. 31, 2021	Dec. 31, 2020
Debt disclosures by scheduled maturity date
Accreted Balance		$ 899,308,000	$ 1,248,219,000
Deferred financing costs, net		(5,537,000)	(21,388,000)
Senior Unsecured Bonds | 4.50% Senior unsecured notes maturing on December 1, 2022
Debt disclosures by scheduled maturity date
Coupon Rate (as a percent)	4.50%
Face amount of loan	$ 100,000,000
Redemption price, percentage	105.334%
Senior unsecured notes
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		900,000,000
Accreted Balance		900,915,000	1,251,889,000
Deferred financing costs, net		(1,607,000)	(3,670,000)
Senior notes, net of deferred finance costs		899,308,000	1,248,219,000
Senior unsecured notes | 3.25% Senior unsecured notes maturing October 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		500,000,000
Accreted Balance		$ 499,913,000	499,803,000
Coupon Rate (as a percent)		3.25%
Initial Term (in Years)		5 years
Senior unsecured notes | 4.50% Senior unsecured notes maturing on December 1, 2022
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 300,000,000
Accreted Balance		$ 301,002,000	302,086,000
Coupon Rate (as a percent)		4.50%
Initial Term (in Years)		10 years
Senior unsecured notes | 4.27% Senior unsecured notes maturing on December 17, 2025
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 100,000,000
Accreted Balance		$ 100,000,000	100,000,000
Coupon Rate (as a percent)		4.27%
Initial Term (in Years)		10 years
Senior unsecured notes | Senior unsecured notes maturing August 2021
Debt disclosures by scheduled maturity date
Unpaid Principal Balance		$ 0
Accreted Balance		$ 0	$ 350,000,000
Coupon Rate (as a percent)		0.00%
Initial Term (in Years)		3 years

Corporate Indebtedness - Junior

Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details)	1 Months Ended	12 Months Ended
	Jun. 30, 2005USD ($)	Dec. 31, 2021USD ($)quarter
Principal Repayments and Joint Venture Debt
2022		$ 1,257,589,000
2023		56,583,000
2024		538,017,000
2025		100,812,000
2026		390,841,000
Thereafter		1,730,618,000
Repayments of principal		$ 4,074,460,000
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000,000
Trust Preferred Securities | LIBOR
Debt Instrument [Line Items]
Interest rate added to base rate (as a percent)		125.00%
Interest payment deferment, number of consecutive quarters | quarter		8
Joint venture
Principal Repayments and Joint Venture Debt
2022		$ 426,057,000
2023		750,696,000
2024		616,510,000
2025		1,391,185,000
2026		150,486,000
Thereafter		2,435,913,000
Repayments of principal		5,770,847,000
Joint venture | Mortgages and other loans payable
Scheduled Amortization
2022		8,754,000
2023		6,583,000
2024		5,268,000
2025		812,000
2026		841,000
Thereafter		70,000
Future Amortization of Debt		22,328,000
Principal Repayments and Joint Venture Debt
2022		448,835,000
2023		50,000,000
2024		332,749,000
2025		0
2026		0
Thereafter		580,548,000
Repayments of principal		1,412,132,000
Joint venture | Revolving Credit Facility
Principal Repayments and Joint Venture Debt
2022		0
2023		0
2024		0
2025		0
2026		390,000,000
Thereafter		0
Repayments of principal		390,000,000
Joint venture | Unsecured Term Loans
Principal Repayments and Joint Venture Debt
2022		0
2023		0
2024		200,000,000
2025		0
2026		0
Thereafter		1,050,000,000
Repayments of principal		1,250,000,000
Joint venture | Trust Preferred Securities
Principal Repayments and Joint Venture Debt
2022		0
2023		0
2024		0
2025		0
2026		0
Thereafter		100,000,000
Repayments of principal		100,000,000
Joint venture | Senior Unsecured Notes
Principal Repayments and Joint Venture Debt
2022		800,000,000
2023		0
2024		0
2025		100,000,000
2026		0
Thereafter		0
Repayments of principal		$ 900,000,000

Corporate Indebtedness - Schedu

Corporate Indebtedness - Schedule of Consolidated Interest Expense, Excluding Capitalized Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest expense
Interest expense before capitalized interest	$ 145,197	$ 185,934	$ 246,848
Interest on financing leases	5,448	8,091	3,243
Interest capitalized	(78,365)	(75,167)	(55,446)
Interest income	(1,389)	(2,179)	(4,124)
Interest expense, net	$ 70,891	$ 116,679	$ 190,521

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Operating expenses, paid to related parties		$ 12,377	$ 12,643	$ 18,106
Operating lease rent		26,554	29,043	33,188
Amounts due from/to related parties
Due from joint ventures		28,204	27,006
Other		1,204	7,651
Related party receivables		29,408	34,657
One Vanderbilt Avenue
Related Party Transaction [Line Items]
Operating lease rent		2,400
SUMMIT One Vanderbilt
Related Party Transaction [Line Items]
Operating lease rent		5,000
Alliance Building Services | Affiliated Entity
Related Party Transaction [Line Items]
Profit participation from related party		1,700	1,400	3,900
Operating expenses, paid to related parties		14,000	13,300	18,800
Stephen L Green Interest | Affiliated Entity
Related Party Transaction [Line Items]
Property management fees from related party		$ 700	$ 600	$ 600
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue | Affiliated Entity
Related Party Transaction [Line Items]
Due from (to) related party	$ 1,400
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue | Minimum | Affiliated Entity
Related Party Transaction [Line Items]
Percentage of profits due to investors	150.00%
Marc Holliday, Chairman And CEO | One Vanderbilt Avenue | Maximum | Affiliated Entity
Related Party Transaction [Line Items]
Percentage of profits due to investors	180.00%
Andrew Mathias, President | One Vanderbilt Avenue | Affiliated Entity
Related Party Transaction [Line Items]
Due from (to) related party	$ 1,000
Andrew Mathias, President | One Vanderbilt Avenue | Minimum | Affiliated Entity
Related Party Transaction [Line Items]
Percentage of profits due to investors	100.00%
Andrew Mathias, President | One Vanderbilt Avenue | Maximum | Affiliated Entity
Related Party Transaction [Line Items]
Percentage of profits due to investors	120.00%
Holiday And Mathias | One Vanderbilt Avenue | Affiliated Entity
Related Party Transaction [Line Items]
Stabilization of property, within three years after stabilization, percent		50.00%
Stabilization of property, three years or more after stabilization, percent		100.00%
Stabilization of property, anniversary period		7 years

Noncontrolling Interests on t_3

Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)shares$ / shares	Dec. 31, 2020USD ($)unit	Dec. 31, 2019USD ($)
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Distributions | $	$ (6,631)	$ (78,855)	$ (478)
Acquisition of subsidiary interest from noncontrolling interest | $		(1,536)	(25,845)
Net income | $	25,457	20,016	13,301
Accumulated other comprehensive loss allocation | $	$ 1,042	(2,299)	(2,276)
Series B Preferred Stock
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Preferred units, issued (in shares)	0
SL Green Operating Partnership
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Balance at beginning of period | $	$ 358,262	409,862
Distributions | $	(15,749)	(12,652)
Issuance of common units | $	18,678	12,018
Acquisition of subsidiary interest from noncontrolling interest | $	(53,289)	(36,085)
Net income | $	25,457	20,016
Accumulated other comprehensive loss allocation | $	1,042	(2,299)
Fair value adjustment | $	9,851	(32,598)
Balance at end of period | $	$ 344,252	$ 358,262	409,862
SL Green Operating Partnership
Organization
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)	3,781,565	3,938,823
Shares of common stock reserved for issuance upon redemption of units of limited partnership interest in operating partnership (shares)	3,781,565
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Distributions | $	$ (6,631)	$ (78,855)	(478)
Acquisition of subsidiary interest from noncontrolling interest | $		(1,536)	(25,845)
Accumulated other comprehensive loss allocation | $	$ 1,042	$ (2,299)	$ (2,276)
SL Green Operating Partnership | Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	5.57%	5.59%
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	3.50%
Preferred Units, shares authorized (in shares)	109,161
Number of preferred units issued (in shares)	109,161
Number of Units Outstanding (in shares)	109,161
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 35
Liquidation preference of preferred units (in dollars per share) | $ / shares	1,000
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 0
Number of company common stock issued on conversion of Series B preferred units	6.71348
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	7.00%
Preferred Units, shares authorized (in shares)	60
Number of preferred units issued (in shares)	60
Number of Units Outstanding (in shares)	60
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 70
Liquidation preference of preferred units (in dollars per share) | $ / shares	1,000
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 29.12
SL Green Operating Partnership | Series G Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	4.50%
Preferred Units, shares authorized (in shares)	1,902,000
Number of preferred units issued (in shares)	1,902,000
Number of Units Outstanding (in shares)	718,697
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1.1250
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 88.50
Number of company common stock issue on redemption of operation partnership common units	1
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
Number of Units Outstanding (in shares)	341,677
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 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	4.00%
Preferred Units, shares authorized (in shares)	500,000
Number of preferred units issued (in shares)	378,634
Number of Units Outstanding (in shares)	372,634
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series P Preferred Units
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Stated Distribution Rate	4.00%
Preferred Units, shares authorized (in shares)	200,000
Number of preferred units issued (in shares)	200,000
Number of Units Outstanding (in shares)	200,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 0
SL Green Operating Partnership | Series Q 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)	268,000
Number of preferred units issued (in shares)	268,000
Number of Units Outstanding (in shares)	268,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 148.95
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
Number of Units Outstanding (in shares)	400,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 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	4.00%
Preferred Units, shares authorized (in shares)	1,077,280
Number of preferred units issued (in shares)	1,077,280
Number of Units Outstanding (in shares)	1,077,280
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 1
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 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	3.50%
Preferred Units, shares authorized (in shares)	40,000
Number of preferred units issued (in shares)	40,000
Number of Units Outstanding (in shares)	40,000
Annual dividends on preferred units (in dollars per share) | $ / shares	$ 0.8750
Liquidation preference of preferred units (in dollars per share) | $ / shares	25
Conversion Price Per Unit (in dollars per share) | $ / shares	$ 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
Number of Units Outstanding (in shares)	1
Preferred stock, dividend, multiplier per common unit distribution	1,350

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Rollforward Analysis of Preferred Unit Activity
Redemption of preferred units		$ (1,536)	$ (25,845)
SL Green Operating Partnership
Rollforward Analysis of Preferred Unit Activity
Redemption of preferred units		(1,536)	(25,845)
SL Green Operating Partnership | Preferred Units
Rollforward Analysis of Preferred Unit Activity
Balance at beginning of period	$ 202,169	283,285
Issuance of preferred units	0	0
Redemption of preferred units	(6,040)	(82,750)
Dividends paid on preferred units	(6,760)	(6,163)
Accrued dividends on preferred units	6,706	7,797
Balance at end of period	$ 196,075	$ 202,169	$ 283,285

Stockholders' Equity of the C_3

Stockholders' Equity of the Company - Additional Information (Details)		Jan. 18, 2022	Jan. 10, 2022	Dec. 02, 2021$ / shares	Dec. 31, 2021$ / sharesshares	Dec. 31, 2020$ / sharesshares	Dec. 31, 2019$ / sharesshares	Dec. 31, 2021$ / sharesshares	Dec. 31, 2020$ / sharesshares	Dec. 31, 2019$ / sharesshares	Dec. 31, 2018shares
Class of Stock [Line Items]
Authorized capital stock (in shares) | shares					260,000,000			260,000,000
Authorized shares, par value (in dollars per share)					$ 0.01			$ 0.01
Common stock, shares authorized (in shares) | shares					160,000,000	160,000,000		160,000,000	160,000,000
Common stock, par value (in dollars per share)					$ 0.01	$ 0.01		$ 0.01	$ 0.01
Excess stock, shares authorized (shares) | shares					75,000,000			75,000,000
Excess stock, par value (in dollars per share)					$ 0.01			$ 0.01
Preferred stock, shares authorized (shares) | shares					25,000,000			25,000,000
Preferred stock, par (in dollars per share)					$ 0.01			$ 0.01
Excess shares issued (shares) | shares					0			0
Cash distribution declared, per common share (in dollars per share)					$ 0.3203	$ 0.3217	$ 0.9387	$ 6.2729	4.9374	$ 3.6434
Ordinary Dividend
Class of Stock [Line Items]
Cash distribution declared, per common share (in dollars per share)				$ 0.3108
Special Dividend
Class of Stock [Line Items]
Cash distribution declared, per common share (in dollars per share)				$ 2.4392
SL Green Operating Partnership
Class of Stock [Line Items]
Cash distribution declared, per common share (in dollars per share)								$ 6.2729	$ 4.9374	$ 3.6434
Common Stock
Class of Stock [Line Items]
Shares, outstanding (in shares) | shares	[1]				64,105,000	66,474,000	74,672,000	64,105,000	66,474,000	74,672,000	78,897,000
Common Stock | Subsequent Event
Class of Stock [Line Items]
Reverse stock split conversion ratio		1.03060	1.03060
Common Stock | SL Green Operating Partnership
Class of Stock [Line Items]
Shares, outstanding (in shares) | shares					64,105,276			64,105,276
[1]	On January 18, 2022, we completed a reverse stock split whereby every 1.03060 SL Green common share was combined into 1 SL Green common share. We have retroactively adjusted the outstanding share counts, share activity, cash distributions declared, and earnings per share, as if the reverse split occurred on December 31, 2018.

Stockholders' Equity of the C_4

Stockholders' Equity of the Company - Stock Repurchase Program (Details)	12 Months Ended
	Dec. 31, 2021USD ($)increase$ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Jun. 30, 2018USD ($)	Aug. 31, 2016USD ($)
Class of Stock [Line Items]
Number of shares purchased (in shares) | shares	4,474,649	8,285,460	4,333,260	9,187,480	7,865,206
Average price paid per share (in dollars per share) | $ / shares	$ 75.44	$ 64.30	$ 88.69	$ 102.06	$ 107.81
2016 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, authorized amount | $		$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 1,000,000,000
Number of increases to share repurchase program | increase	5
Stock repurchase program, authorized amount, total | $	$ 3,500,000,000
Number of shares purchased (in shares) | shares	34,146,055	29,671,406	21,385,946	17,052,686	7,865,206

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, 2021	Dec. 31, 2020
Stockholders' Equity
Preferred stock, shares outstanding (in shares)	9,200,000	9,200,000	9,200,000
Dividend rate preferred units (as a percent)	6.50%	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	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2021
Stockholders' Equity
Common stock, shares authorized (in shares)	160,000,000	160,000,000
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Stockholders' Equity
Common stock, shares authorized (in shares)				3,500,000
Issuance of common stock (in shares)	10,387	16,181	3,645
Dividend reinvestments/stock purchases under the DRSPP	$ 738	$ 1,006	$ 334

Stockholders' Equity of the C_7

Stockholders' Equity of the Company - Earnings per Share (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic Earnings:
Income attributable to SL Green common stockholders	$ 434,804	$ 356,105	$ 255,484
Net income attributable to SL Green common stockholders (numerator for basic earnings per share)	432,214	354,283	253,784
Effect of Dilutive Securities:
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	2,039	1,685	1,700
Add back: undistributed earnings allocated to participating securities	192	137	0
Add back: Effect of dilutive securities (redemption of units to common shares)	25,457	20,016	13,301
Diluted Earnings:
Income attributable to SL Green common stockholders (numerator for diluted earnings per share)	$ 459,902	$ 376,121	$ 268,785
Basic Shares:
Weighted average common stock outstanding (in shares)	65,740,000	70,397,000	77,057,000
Effect of Dilutive Securities:
Operating Partnership units redeemable for common shares (in shares)	3,987,000	4,096,000	4,275,000
Stock-based compensation plans (in shares)	705,000	441,000	533,000
Contingently issuable shares from special dividend declared December 4, 2020 (in shares)	337,000	144,000	0
Diluted weighted average common stock outstanding (in shares)	70,769,000	75,078,000	81,865,000
Common stock shares excluded from the diluted shares outstanding (shares)	948,017	1,676,825	1,181,014

Partners' Capital of the Oper_3

Partners' Capital of the Operating Partnership - Additional Information (Details)		12 Months Ended
		Dec. 31, 2021shares	Dec. 31, 2020unitshares	Dec. 31, 2019shares	Dec. 31, 2018shares
Common Stock
Stockholders' Equity
Units, outstanding (in units)	[1]	64,105,000	66,474,000	74,672,000	78,897,000
SL Green Operating Partnership
Stockholders' Equity
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)		3,781,565	3,938,823
SL Green Operating Partnership | Series I Preferred Units
Stockholders' Equity
Units, outstanding (in units)		9,200,000
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)		64,105,276
[1]	On January 18, 2022, we completed a reverse stock split whereby every 1.03060 SL Green common share was combined into 1 SL Green common share. We have retroactively adjusted the outstanding share counts, share activity, cash distributions declared, and earnings per share, as if the reverse split occurred on December 31, 2018.

Partners' Capital of the Oper_4

Partners' Capital of the Operating Partnership - EPS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator
Net income attributable to SL Green common stockholders (numerator for basic earnings per share)	$ 432,214	$ 354,283	$ 253,784
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	2,039	1,685	1,700
Add back: undistributed earnings allocated to participating securities	$ (192)	$ (137)	$ 0
Denominator
Weighted average common stock outstanding (in shares)	65,740,000	70,397,000	77,057,000
Diluted weighted average common stock outstanding (in shares)	70,769,000	75,078,000	81,865,000
Common stock shares excluded from the diluted shares outstanding (shares)	948,017	1,676,825	1,181,014
SL Green Operating Partnership
Numerator
Net income attributable to SLGOP common unitholders	$ 460,261	$ 376,121	$ 268,785
Less: distributed earnings allocated to participating securities	(2,398)	(1,685)	(1,700)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(192)	(137)	0
Net income attributable to SL Green common stockholders (numerator for basic earnings per share)	457,671	374,299	267,085
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares	2,590	1,822	1,700
Income attributable to SLGOP common unitholders	$ 460,261	$ 376,121	$ 268,785
Denominator
Weighted average common stock outstanding (in shares)	69,667,000	74,493,000	81,332,000
Stock-based compensation plans (shares)	765,000	441,000	543,000
Contingently issuable units from special dividend declared December 4, 2020 (in shares)	337,000	144,000	(10,000)
Diluted weighted average common stock outstanding (in shares)	70,769,000	75,078,000	81,865,000

Share-based Compensation - Addi

Share-based Compensation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021USD ($)unit / sharesfungibleUnitshares	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options	$ 2,100,000	$ 2,200,000	$ 2,100,000
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	0	0	0
Remaining weighted average contractual life of the options outstanding (in years)	2 years 3 months 18 days
Remaining weighted average contractual life of the options exercisable (in years)	2 years 3 months 18 days
Total unrecognized compensation cost related to unvested stock awards	$ 0
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
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual award vesting rate, low end of range (as a percent)	15.00%
Annual award vesting rate, high end of range (as a percent)	35.00%
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	10.00%
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 8,497,054	$ 10,895,459	$ 12,892,249
Total unrecognized compensation cost related to unvested stock awards	$ 6,900,000
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)	1 year 9 months 18 days
Fair value of restricted stock vested during the period	$ 11,300,000	12,500,000	12,100,000
Weighted average fair value of options granted during the period	$ 9,214,531	$ 734,315	$ 11,131,181
Awards granted (in shares) | shares	141,515	8,693	119,122
Awards outstanding (in shares) | shares	3,459,363	3,337,545	3,362,456	3,254,553
LTIP units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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	$ 55,000,000	$ 37,000,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock awards	46,600,000
Share-based compensation	$ 41,900,000	29,400,000	$ 22,200,000
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)	85.00%
Shares of common stock issued (shares) | shares	172,421
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	27,030,000
Fungible units per share (in fungible units per share) | unit / shares	3.74
Shares that may be issued if equal to fungible units (shares) (less than) | shares	27,030,000
Fungible units | fungibleUnit	2,000,000
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	0.73
Third Amendment and Restated 2005 Stock Option and Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0	$ 0	$ 2,500,000
Deferred Stock Compensation Plan for Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,300,000
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)	100.00%
Awards granted (in shares) | shares	24,426
Shares issued (in shares) | shares	12,312
Awards outstanding (in shares) | shares	165,201

Share-based Compensation - Acti

Share-based Compensation - Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock options
Options Outstanding
Balance at beginning of year (in shares)	761,686	977,745	1,071,977
Granted (in shares)	0	0	0
Exercised (in shares)	(11,314)	0	0
Lapsed or cancelled (in shares)	(356,283)	(216,059)	(94,232)
Balance at end of period (in shares)	394,089	761,686	977,745
Options exercisable at end of period (in shares)	394,089	760,743	862,593
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 105.76	$ 108.57	$ 109.82
Exercised (in dollars per share)	72.30	0	0
Lapsed or cancelled (in dollars per share)	112.56	118.49	122.84
Balance at end of period (in dollars per share)	100.56	105.76	108.57
Options exercisable at end of period (in dollars per share)	$ 100.56	$ 105.76	$ 107.86
Restricted Stock Awards
Summary of restricted stock
Balance at beginning of year (in shares)	3,337,545	3,362,456	3,254,553
Granted (in shares)	141,515	8,693	119,122
Cancelled (in shares)	(19,697)	(33,604)	(11,219)
Balance at end of period (in shares)	3,459,363	3,337,545	3,362,456
Vested during the period (in shares)	122,759	125,064	106,780
Compensation expense recorded	$ 8,497,054	$ 10,895,459	$ 12,892,249

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	$ 4,935,795	$ 5,517,198	$ 5,947,855
Other comprehensive income (loss) before reclassifications	(3,011)	(57,361)	(43,495)
Amounts reclassified from accumulated other comprehensive loss	23,500	18,599	(98)
Ending Balance	4,778,253	4,935,795	5,517,198
Deferred net losses from terminated hedges	(600)	(500)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(67,247)	(28,485)	15,108
Ending Balance	(46,758)	(67,247)	(28,485)
Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(57,415)	(22,780)	9,716
Other comprehensive income (loss) before reclassifications	14,908	(48,532)	(32,723)
Amounts reclassified from accumulated other comprehensive loss	16,626	13,897	227
Ending Balance	(25,881)	(57,415)	(22,780)
Net unrealized gain on marketable securities
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	1,021	2,277	1,093
Other comprehensive income (loss) before reclassifications	96	(1,256)	1,184
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending Balance	1,117	1,021	2,277
Joint venture
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	6,349,006
Ending Balance	4,264,657	6,349,006
Joint venture | Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
Beginning Balance	(10,853)	(7,982)	4,299
Other comprehensive income (loss) before reclassifications	(18,015)	(7,573)	(11,956)
Amounts reclassified from accumulated other comprehensive loss	6,874	4,702	(325)
Ending Balance	$ (21,994)	$ (10,853)	$ (7,982)

Fair Value Measurements (Detail

Fair Value Measurements (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)retailAsset	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jul. 31, 2021
Fair Value of Financial Instruments
Marketable securities available-for-sale	$ 28,570	$ 24,146	$ 28,570
Interest rate cap and swap agreements (included in Other assets)	28	1,896	28
Purchase price and other fair value adjustment		210,070	187,522	$ 69,389
Debt and preferred equity investments	1,076,542	1,088,723	1,076,542
220 East 42nd Street
Fair Value of Financial Instruments
Ownership interest disposed					49.00%
Carrying Value
Fair Value of Financial Instruments
Fixed rate debt	3,135,572	3,274,324	3,135,572
Variable rate debt	1,827,677	801,051	1,827,677
Total	4,963,249	4,075,375	4,963,249
Fair Value
Fair Value of Financial Instruments
Marketable securities available-for-sale	28,570	24,146	28,570
Total	5,059,815	4,137,135	5,059,815
Estimated fair value of debt and preferred equity investments, low end of range	1,000,000	1,000,000	1,000,000
Estimated fair value of debt and preferred equity investments, high end of range	1,100,000	1,100,000	1,100,000
Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other assets)	0	0	0
Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in Other assets)	28	1,896	28
Level 3
Fair Value of Financial Instruments
Marketable securities available-for-sale	0	0	0
Interest rate cap and swap agreements (included in Other assets)	0	0	0
Level 3 | Carrying Value
Fair Value of Financial Instruments
Debt and preferred equity investments	1,076,542	1,088,723	1,076,542
Level 3 | Fair Value
Fair Value of Financial Instruments
Fixed rate debt	3,237,075	3,336,463	3,237,075
Variable rate debt	1,822,740	800,672	1,822,740
Equity marketable securities | Level 1
Fair Value of Financial Instruments
Marketable securities available-for-sale	0	0	0
Mortgage-backed securities
Fair Value of Financial Instruments
Marketable securities available-for-sale	28,570	24,146	28,570
Mortgage-backed securities | Level 2
Fair Value of Financial Instruments
Marketable securities available-for-sale	$ 28,570	24,146	$ 28,570
106 Spring Street And 133 Greene Street
Fair Value of Financial Instruments
Number of impaired retail assets | retailAsset	2
106 Spring Street
Fair Value of Financial Instruments
Asset impairment loss	$ 39,700
133 Greene Street
Fair Value of Financial Instruments
Asset impairment loss	$ 14,100
One Madison Avenue
Fair Value of Financial Instruments
Ownership percentage deconsolidated	50.50%		50.50%
Investment fair value adjustment			$ 187,500
220 East 42nd Street | 220 East 42nd Street
Fair Value of Financial Instruments
Ownership percentage deconsolidated					51.00%
Investment fair value adjustment		206,800
Accrued Interest Payable and Other
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$ 61,217	29,912	61,217
Accrued Interest Payable and Other | Level 1
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	0	0	0
Accrued Interest Payable and Other | Level 2
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	61,217	29,912	61,217
Accrued Interest Payable and Other | Level 3
Fair Value of Financial Instruments
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)	$ 0	$ 0	$ 0

Financial Instruments_ Deriva_3

Financial Instruments: Derivatives and Hedging (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Instruments: Derivatives and Hedging
Fair Value	$ 1,896	$ 28
Gain (loss) from changes in fair value	0	100	$ 100
Fair value of derivatives in a net liability position	31,300
Aggregate termination value	31,800
Amount of Loss Recognized in Other Comprehensive Loss	(3,757)	(59,221)	(44,229)
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Income	(25,184)	(19,480)	(5)
Interest Rate Cap Expiring March 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 85,000
Strike Rate	4.00%
Fair Value	$ 0
Interest Rate Cap Expiring November 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 111,869
Strike Rate	3.50%
Fair Value	$ 1
Interest Rate Swap Expiring January 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	0.212%
Fair Value	$ 376
Interest Rate Swap Expiring February 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 400,000
Strike Rate	0.184%
Fair Value	$ 1,519
Interest Rate Swap Expiring in July 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 100,000
Strike Rate	1.161%
Fair Value	$ (733)
Interest Rate Swap Expiring in July 2023, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	1.131%
Fair Value	$ (1,371)
Interest Rate Swap Expiring January 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000
Strike Rate	2.696%
Fair Value	$ (5,625)
Interest Rate Swap Expiring January 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 150,000
Strike Rate	2.721%
Fair Value	$ (9,369)
Interest Rate Swap Expiring January 2026, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 200,000
Strike Rate	2.74%
Fair Value	$ (12,814)
Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	(28,016)
Amount of Loss Recognized in Other Comprehensive Loss	15,643	(51,244)	(33,907)
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Income	(17,602)	(14,569)	(261)
Interest Expense
Financial Instruments: Derivatives and Hedging
Estimated current balance held in accumulated other comprehensive loss to be reclassified into earnings within the next 12 months	11,500
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	3,800
Joint venture
Financial Instruments: Derivatives and Hedging
Amount of Loss Recognized in Other Comprehensive Loss	(19,400)	(7,977)	(10,322)
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss into Income	(7,582)	$ (4,911)	$ 256
Joint venture | Interest Rate Contract
Financial Instruments: Derivatives and Hedging
Fair Value	5,259
Joint venture | Interest Rate Cap Expiring February 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 220,000
Strike Rate	4.00%
Fair Value	$ 0
Joint venture | Interest Rate Cap Expiring September 2022
Financial Instruments: Derivatives and Hedging
Notional Value	$ 1,075,000
Strike Rate	2.85%
Fair Value	$ 5
Joint venture | Interest Rate Cap Expiring September 2022, 2
Financial Instruments: Derivatives and Hedging
Notional Value	$ 125,000
Strike Rate	2.85%
Fair Value	$ 1
Joint venture | Interest Rate Cap Expiring January 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 23,000
Strike Rate	4.75%
Fair Value	$ 1
Joint venture | Interest Rate Cap Expiring June 2023
Financial Instruments: Derivatives and Hedging
Notional Value	$ 510,000
Strike Rate	3.00%
Fair Value	$ 155
Joint venture | Interest Rate Cap Expiring October 2024
Financial Instruments: Derivatives and Hedging
Notional Value	$ 1,250,000
Strike Rate	1.25%
Fair Value	$ 8,657
Joint venture | Interest Rate Swap Expiring February 2026
Financial Instruments: Derivatives and Hedging
Notional Value	$ 177,000
Strike Rate	1.669%
Fair Value	$ (3,560)

Lease Income - Future Minimum R

Lease Income - Future Minimum Rents (Details) $ in Thousands	Dec. 31, 2021USD ($)
Leases [Abstract]
2022	$ 532,046
2023	485,299
2024	443,632
2025	415,241
2026	374,661
Thereafter	1,655,647
Total payments to be received	$ 3,906,526

Lease Income - Lease Income (De

Lease Income - Lease Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Fixed lease payments	$ 600,474	$ 702,482
Variable lease payments	73,542	96,040
Total lease payments	674,016	798,522
Amortization of acquired above and below-market leases	4,160	5,901
Total rental revenue	678,176	804,423	$ 983,557
Sublease Income	229,200	237,900
Loss recognized at commencement, net	0	(6,237)
Interest income	4,422	1,817
Total gain (loss) recognized on sales-type leases	$ 4,422	$ (4,420)

Lease Income - Sales Type Lease

Lease Income - Sales Type Lease (Details) $ in Thousands	Dec. 31, 2021USD ($)
Leases [Abstract]
2022	$ 3,087
2023	3,133
2024	3,180
2025	3,228
2026	3,276
Thereafter	203,494
Total minimum lease payments	219,398
Amount representing interest	(116,376)
Investment in sales-type leases	$ 103,022

Benefit Plans (Details)

Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Multiemployer Plans [Line Items]
Plan contributions	$ 9,176	$ 11,097		$ 14,160
Employee contribution limit per calendar year	15.00%
Employer matching contribution, percent of match	100.00%	100.00%
Percentage of eligible compensation matched by employer	4.00%	4.00%
Matching contribution	$ 1,500	$ 1,700		1,600
Pension Plan
Multiemployer Plans [Line Items]
Multiemployer plans, surcharge	No
Plan contributions	$ 1,994	2,480	$ 291,300	3,103	$ 290,100
Multiemployer plans, contributions by employer, percent	5.00%
Health Plan
Multiemployer Plans [Line Items]
Plan contributions	$ 6,333	7,688	$ 1,600,000	9,949	$ 1,500,000
Multiemployer plans, contributions by employer, percent	5.00%
Other plans
Multiemployer Plans [Line Items]
Plan contributions	$ 849	$ 929		$ 1,108

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Employment agreements with certain executives, minimum cash-based compensation for next fiscal year	$ 3,400,000
Initial term of non cancellable operating leases, minimum (in years)	1 year
Financing leases
2022	$ 3,523,000
2023	3,570,000
2024	3,641,000
2025	3,810,000
2026	3,858,000
Thereafter	256,691,000
Total minimum lease payments	275,093,000
Amount representing interest	(149,563,000)
Total lease liabilities excluding liabilities related to assets held for sale	125,530,000
Leases reclassified to liabilities related to assets held for sale	(22,616,000)
Lease liabilities	102,914,000	$ 152,521,000
Non-cancellable operating leases
2022	36,776,000
2023	48,680,000
2024	54,545,000
2025	54,772,000
2026	54,911,000
Thereafter	1,395,533,000
Total minimum lease payments	1,645,217,000
Amount discounted using incremental borrowing rate	(786,280,000)
Total lease liabilities excluding liabilities related to assets held for sale	858,937,000
Leases reclassified to liabilities related to assets held for sale	(7,567,000)
Lease liability - operating leases	851,370,000	339,458,000
Minimum sublease rentals to be received in the future	$ 3,906,526,000
711 Third Avenue
Other Commitments [Line Items]
Ownership interest	50.00%
Belmont
Other Commitments [Line Items]
Loss reserves	$ 2,900,000	$ 2,900,000
Ticonderoga
Other Commitments [Line Items]
Loss reserves	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Lease Costs
Operating lease costs before capitalized operating lease costs	$ 30,270	$ 32,169
Operating lease costs capitalized	(3,716)	(3,126)
Operating lease costs, net	26,554	29,043	$ 33,188
Finance Lease, Costs [Abstract]
Interest on financing leases	5,448	8,091	$ 3,243
Interest on financing leases capitalized	0	(2,378)
Interest on financing leases, net	5,448	5,713
Finance lease, right-of-use asset, amortization	660	1,200
Financing lease costs, net	$ 6,108	$ 6,913
Operating lease, weighted average discount rate, percent	4.45%
Operating lease, weighted average remaining lease term	32 years

Segment Information - Additiona

Segment Information - Additional Information (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2021USD ($)segment	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Segment information
Number of reportable segments (segment) | segment		2
Total revenues		$ 843,991	$ 1,052,744	$ 1,238,995
Net Income		480,632	414,758	291,487
Total assets	[1]	11,066,629	11,707,567
Marketing, general and administrative		94,912	91,826	100,875
Operating Segments | Real Estate Segment
Segment information
Total revenues		763,651	932,581	1,043,405
Net Income		412,393	354,353	158,972
Total assets		9,974,140	10,579,899
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues		80,340	120,163	195,590
Net Income		68,239	60,405	$ 132,515
Total assets		$ 1,092,489	$ 1,127,668
[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: $193.4 million and $41.2 million of land, $336.9 million and $57.9 million of building and improvements, $— million and $2.0 million of building and leasehold improvements, $15.4 million and $37.8 million of right of use assets, $11.7 million and $10.3 million of accumulated depreciation, $574.4 million and $289.5 million of other assets included in other line items, $418.9 million and $94.0 million of real estate debt, net, $0.8 million and $0.7 million of accrued interest payable, $15.3 million and $29.9 million of lease liabilities, and $145.2 million and $56.6 million of other liabilities included in other line items as of December 31, 2021 and December 31, 2020, respectively.

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 1,399,923
Initial Cost
Land	1,332,556
Building & Improvements	4,894,397
Cost Capitalized Subsequent To Acquisition
Land	18,146
Building & Improvements	1,405,807
Gross Amount at Which Carried at Close of Period
Land	1,350,701
Building & Improvements (3)	6,300,206
Total	7,650,907	$ 7,355,079	$ 8,784,567	$ 8,513,935
Accumulated Depreciation	1,896,199	$ 1,956,077	$ 2,060,560	$ 2,099,137
420 Lexington Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	288,660
Initial Cost
Land	0
Building & Improvements	333,499
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	212,293
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements (3)	545,792
Total	545,792
Accumulated Depreciation	183,070
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	69,839
Gross Amount at Which Carried at Close of Period
Land	19,844
Building & Improvements (3)	185,608
Total	205,452
Accumulated Depreciation	71,105
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	2,376
Gross Amount at Which Carried at Close of Period
Land	18,846
Building & Improvements (3)	143,322
Total	162,168
Accumulated Depreciation	86,730
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	6,421
Gross Amount at Which Carried at Close of Period
Land	28,873
Building & Improvements (3)	94,697
Total	123,570
Accumulated Depreciation	38,024
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	20,428
Gross Amount at Which Carried at Close of Period
Land	51,093
Building & Improvements (3)	271,951
Total	323,044
Accumulated Depreciation	114,853
625 Madison 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	291,319
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	62,282
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements (3)	353,601
Total	353,601
Accumulated Depreciation	145,749
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	(14,169)
Gross Amount at Which Carried at Close of Period
Land	78,282
Building & Improvements (3)	438,462
Total	516,744
Accumulated Depreciation	188,678
609 Fifth Avenue - Retail Condominium
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	52,882
Initial Cost
Land	16,869
Building & Improvements	107,185
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	62,554
Gross Amount at Which Carried at Close of Period
Land	16,869
Building & Improvements (3)	169,739
Total	186,608
Accumulated Depreciation	19,879
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	5,205
Gross Amount at Which Carried at Close of Period
Land	114,077
Building & Improvements (3)	556,024
Total	670,101
Accumulated Depreciation	221,222
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	127,030
Gross Amount at Which Carried at Close of Period
Land	0
Building & Improvements (3)	918,136
Total	918,136
Accumulated Depreciation	348,065
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	0
Gross Amount at Which Carried at Close of Period
Land	90,941
Building & Improvements (3)	431,517
Total	522,458
Accumulated Depreciation	168,295
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	(33,873)
Gross Amount at Which Carried at Close of Period
Land	20,913
Building & Improvements (3)	127,470
Total	148,383
Accumulated Depreciation	36,923
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	(6,240)
Gross Amount at Which Carried at Close of Period
Land	383
Building & Improvements (3)	2,177
Total	2,560
Accumulated Depreciation	516
100 Church Street
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	200,212
Initial Cost
Land	34,994
Building & Improvements	183,932
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	6,326
Gross Amount at Which Carried at Close of Period
Land	34,994
Building & Improvements (3)	190,258
Total	225,252
Accumulated Depreciation	65,736
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	15,899
Gross Amount at Which Carried at Close of Period
Land	120,900
Building & Improvements (3)	286,497
Total	407,397
Accumulated Depreciation	109,858
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	0
Gross Amount at Which Carried at Close of Period
Land	8,603
Building & Improvements (3)	2,074
Total	10,677
Accumulated Depreciation	0
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	5,139
Gross Amount at Which Carried at Close of Period
Land	54,489
Building & Improvements (3)	95,782
Total	150,271
Accumulated Depreciation	26,627
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	(2,450)
Building & Improvements	63,077
Gross Amount at Which Carried at Close of Period
Land	281,836
Building & Improvements (3)	71,391
Total	353,227
Accumulated Depreciation	4,991
719 Seventh Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	50,000
Initial Cost
Land	41,180
Building & Improvements	46,232
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	(4,725)
Gross Amount at Which Carried at Close of Period
Land	41,180
Building & Improvements (3)	41,507
Total	82,687
Accumulated Depreciation	$ 3,356
719 Seventh Avenue | 719 Seventh Avenue
Gross Amount at Which Carried at Close of Period
Interest in property (as a percent)	75.00%
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	2,578
Gross Amount at Which Carried at Close of Period
Land	45,120
Building & Improvements (3)	230,971
Total	276,091
Accumulated Depreciation	42,909
185 Broadway
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	198,169
Initial Cost
Land	45,540
Building & Improvements	27,865
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	177,184
Gross Amount at Which Carried at Close of Period
Land	45,540
Building & Improvements (3)	205,049
Total	250,589
Accumulated Depreciation	419
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	0
Building & Improvements	15,396
Gross Amount at Which Carried at Close of Period
Land	138,445
Building & Improvements (3)	259,438
Total	397,883
Accumulated Depreciation	7,885
690 Madison Avenue
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	60,000
Initial Cost
Land	13,820
Building & Improvements	51,732
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	13,820
Building & Improvements (3)	51,732
Total	65,552
Accumulated Depreciation	409
1591-1597 Broadway
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	123,919
Building & Improvements	0
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	0
Gross Amount at Which Carried at Close of Period
Land	123,919
Building & Improvements (3)	0
Total	123,919
Accumulated Depreciation	0
Other
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Land	1,734
Building & Improvements	16,224
Cost Capitalized Subsequent To Acquisition
Land	0
Building & Improvements	610,787
Gross Amount at Which Carried at Close of Period
Land	1,734
Building & Improvements (3)	627,011
Total	628,745
Accumulated Depreciation	$ 10,900

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, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in real estate
Balance at beginning of year	$ 7,355,079	$ 8,784,567	$ 8,513,935
Property acquisitions	124,103	178,635	0
Improvements	296,876	481,327	251,674
Retirements/disposals/deconsolidation	(125,151)	(2,089,450)	18,958
Balance at end of year	7,650,907	7,355,079	8,784,567
Aggregate cost of land, buildings and improvements before depreciation	8,800,000
Changes in accumulated depreciation
Balance at beginning of year	1,956,077	2,060,560	2,099,137
Depreciation for year	174,219	270,843	222,867
Retirements/disposals/deconsolidation	(234,097)	(375,326)	(261,444)
Balance at end of year	$ 1,896,199	$ 1,956,077	$ 2,060,560