Segments - Schedule of NOI for Each Reportable Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Property-related revenues		$ 171,697	$ 174,496
Property-related operating expenses		(66,661)	(66,618)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		11,234	10,326
NOI	[1]	116,270	118,204
New York [Member]
Segment Reporting Information [Line Items]
Property-related revenues		115,405	111,837
Property-related operating expenses		(48,211)	(49,024)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		2,818	2,821
NOI	[1]	70,012	65,634
San Francisco [Member]
Segment Reporting Information [Line Items]
Property-related revenues		57,089	63,472
Property-related operating expenses		(17,292)	(16,938)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		8,354	7,537
NOI	[1]	48,151	54,071
Other [Member]
Segment Reporting Information [Line Items]
Property-related revenues		(797)	(813)
Property-related operating expenses		(1,158)	(656)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		62	(32)
NOI	[1]	$ (1,893)	$ (1,501)

[1] NOI is used to measure the operating performance of our properties. NOI consists of rental revenue (which includes property rentals, tenant reimbursements and lease termination income) and certain other property-related revenue less operating expenses (which includes property-related expenses such as cleaning, security, repairs and maintenance, utilities, property administration and real estate taxes). We use NOI internally as a performance measure and believe it provides useful information to investors regarding our financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. Other real estate companies may use different methodologies for calculating NOI and, accordingly, our presentation of NOI may not be comparable to other real estate companies.