Mortgage Notes Payable, Net - Mortgage Notes (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Mortgage notes payable, gross		$ 399,500
Mortgage notes payable, net of deferred financing costs		$ 394,159	$ 398,117
Mortgages
Debt Instrument [Line Items]
Encumbered Properties | property		7
Mortgage notes payable, gross		$ 399,500	405,000
Effective Interest Rate		4.35%
Less: deferred financing costs, net		$ (5,341)	(6,883)
Mortgage notes payable, net of deferred financing costs		$ 394,159	398,117
9 Times Square | Mortgages
Debt Instrument [Line Items]
Encumbered Properties | property		1
Mortgage notes payable, gross		$ 49,500	55,000
Effective Interest Rate		3.72%
Payment of mortgage note payable	$ 5,500
Restricted cash			4,300
1140 Avenue of the Americas | Mortgages
Debt Instrument [Line Items]
Encumbered Properties | property		1
Mortgage notes payable, gross		$ 99,000	99,000
Effective Interest Rate		4.17%
Restricted cash		$ 3,600	4,500
123 William Street
Debt Instrument [Line Items]
Escrow deposit		$ 100
123 William Street | Mortgages
Debt Instrument [Line Items]
Encumbered Properties | property		1
Mortgage notes payable, gross		$ 140,000	140,000
Effective Interest Rate		4.73%
Proceeds from escrow draw		$ 1,500
400 E. 67th Street - Laurel Condominium/200 Riverside Boulevard - ICON Garage | Mortgages
Debt Instrument [Line Items]
Encumbered Properties | property		2
Mortgage notes payable, gross		$ 50,000	50,000
Effective Interest Rate		4.58%
8713 Fifth Avenue | Mortgages
Debt Instrument [Line Items]
Encumbered Properties | property		1
Mortgage notes payable, gross		$ 10,000	10,000
Effective Interest Rate		5.04%
196 Orchard Street | Mortgages
Debt Instrument [Line Items]
Encumbered Properties | property		1
Mortgage notes payable, gross		$ 51,000	$ 51,000
Effective Interest Rate		3.90%
A8713 Fifth Avenue | Mortgages
Debt Instrument [Line Items]
Mortgage notes payable, gross		$ 10,000