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Debt - Long-Term Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 17, 2020
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 0	$ 0
Total principal	2,150,876,000
Deferred financing costs, net	(23,487,000)	(17,367,000)
Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	785,876,000	786,884,000
Mortgages, senior notes, and unsecured term loan facilities, not including unsecured revolving credit facility
Debt Instrument [Line Items]
Total principal	2,150,876,000	2,151,884,000
Deferred financing costs, net	(14,575,000)	(15,235,000)
Total	2,136,301,000	2,136,649,000
Metro Center | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 86,803,000	87,382,000
Stated Rate (as a percentage)	3.59%
Effective Rate (as a percentage)	3.68%
10 Union Square | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 50,000,000	50,000,000
Stated Rate (as a percentage)	3.70%
Effective Rate (as a percentage)	3.97%
1542 Third Avenue | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 30,000,000	30,000,000
Stated Rate (as a percentage)	4.29%
Effective Rate (as a percentage)	4.53%
First Stamford Place | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 180,000,000	180,000,000
Stated Rate (as a percentage)	4.28%
Effective Rate (as a percentage)	4.71%
First Stamford Place - First Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Stated Rate (as a percentage)	4.09%
Face amount	$ 164,000,000
First Stamford Place - Second Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Stated Rate (as a percentage)	6.25%
Face amount	$ 16,000,000
1010 Third Avenue and 77 West 55th Street | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 37,278,000	37,477,000
Stated Rate (as a percentage)	4.01%
Effective Rate (as a percentage)	4.23%
250 West 57th Street | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 180,000,000	180,000,000
Stated Rate (as a percentage)	2.83%
Effective Rate (as a percentage)	3.19%
10 Bank Street | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 31,795,000	32,025,000
Stated Rate (as a percentage)	4.23%
Effective Rate (as a percentage)	4.36%
383 Main Avenue | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 30,000,000	30,000,000
Stated Rate (as a percentage)	4.44%
Effective Rate (as a percentage)	4.55%
1333 Broadway | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 160,000,000	160,000,000
Stated Rate (as a percentage)	4.21%
Effective Rate (as a percentage)	4.29%
Senior unsecured notes, Series A | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 100,000,000	100,000,000
Stated Rate (as a percentage)	3.93%
Effective Rate (as a percentage)	3.96%
Senior unsecured notes, Series B | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 125,000,000	125,000,000
Stated Rate (as a percentage)	4.09%
Effective Rate (as a percentage)	4.12%
Senior unsecured notes, Series C | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 125,000,000	125,000,000
Stated Rate (as a percentage)	4.18%
Effective Rate (as a percentage)	4.21%
Senior unsecured notes, Series D | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 115,000,000	115,000,000
Stated Rate (as a percentage)	4.08%
Effective Rate (as a percentage)	4.11%
Senior unsecured notes, Series E | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 160,000,000	160,000,000
Stated Rate (as a percentage)	4.26%
Effective Rate (as a percentage)	4.27%
Senior unsecured notes, Series F | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 175,000,000	175,000,000
Stated Rate (as a percentage)	4.44%
Effective Rate (as a percentage)	4.45%
Senior unsecured notes, Series G | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 100,000,000	100,000,000
Stated Rate (as a percentage)	3.61%		3.61%
Effective Rate (as a percentage)	4.89%
Face amount			$ 100,000,000
Senior unsecured notes, Series H | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 75,000,000	75,000,000
Stated Rate (as a percentage)	3.73%		3.73%
Effective Rate (as a percentage)	5.00%
Face amount			$ 75,000,000
Unsecured term loan facilities | Revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 215,000,000	215,000,000
Effective Rate (as a percentage)	3.56%
Unsecured term loan facilities | Revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percentage)	1.20%
Unsecured revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 0	0
Effective Rate (as a percentage)	0.00%
Unsecured revolving credit facility | Revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percentage)	1.30%
Unsecured term loan facility | Revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 175,000,000	$ 175,000,000
Effective Rate (as a percentage)	3.60%
Unsecured term loan facility | Revolving credit facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percentage)	1.50%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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