Segments - Schedule of NOI for Each Reportable Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Property-related revenues		$ 167,686	$ 179,543	$ 351,603	$ 351,240
Property-related operating expenses		(71,078)	(67,814)	(141,387)	(134,475)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		10,720	11,585	21,101	22,819
NOI	[1]	107,328	123,314	231,317	239,584
New York [Member]
Segment Reporting Information [Line Items]
Property-related revenues		106,837	116,300	224,063	231,705
Property-related operating expenses		(48,685)	(48,147)	(98,206)	(96,358)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		3,404	3,528	6,767	6,346
NOI	[1]	61,556	71,681	132,624	141,693
San Francisco [Member]
Segment Reporting Information [Line Items]
Property-related revenues		61,010	64,042	128,312	121,131
Property-related operating expenses		(21,814)	(18,581)	(42,082)	(35,873)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		7,256	7,971	14,275	16,325
NOI	[1]	46,452	53,432	100,505	101,583
Other [Member]
Segment Reporting Information [Line Items]
Property-related revenues		(161)	(799)	(772)	(1,596)
Property-related operating expenses		(579)	(1,086)	(1,099)	(2,244)
NOI from unconsolidated joint ventures (excluding One Steuart Lane)		(60)	86	59	148
NOI	[1]	$ (680)	$ (1,799)	$ (1,812)	$ (3,692)

[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.