Lessee - Leases Narrative (Details) $ in Thousands				1 Months Ended	12 Months Ended			21 Months Ended
		Dec. 14, 2023 USD ($) ft² a	Aug. 01, 2023 USD ($) ft²	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2023 USD ($)	Dec. 13, 2023
Lessee, Lease, Description [Line Items]
Number of Properties Subject to Ground Leases				5	5	4	4
Lessee, Operating Lease, Option to Terminate					one cancelable and four non-cancelable ground lease obligations	four non-cancelable	four non-cancelable
Operating Lease, Payments					$ 121	$ (125)	$ 23,599
Operating Lease, Right-of-Use Asset	[1]			$ 324,298	324,298	167,351
Operating Lease, Liability				350,391	350,391	204,686
Operating lease costs	[2]				14,451	12,700	13,151
Lease liabilities - finance leases				417,961	417,961	249,335
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability					163,056	0	0
Interest on lease liabilities	[3]				13,747	3,236	$ 2,471
Finance Lease, Right-of-Use Asset				401,680	401,680	$ 237,510
Lessee, Operating Lease, Variable Lease Payment, Terms and Conditions						no ground leases were subject to variable payments	no ground leases were subject to variable payments
Lessee, Operating Lease, Option to Extend						no ground leases were subject to variable payments and extension options	no ground leases were subject to variable payments and extension options
Santa Monica Business Park [Member]
Lessee, Lease, Description [Line Items]
Ownership Percentage	[4]					55.00%
Joint Venture Partner [Member] | Santa Monica Business Park [Member]
Lessee, Lease, Description [Line Items]
Ownership Percentage		45.00%
343 Madison Avenue | Consolidated Entities
Lessee, Lease, Description [Line Items]
Consolidated Entities, Ownership Percentage			55.00%
Lessee, Operating Lease, Term of Contract			99 years
Operating Leases, Future Minimum Payments, Due in Two Years			$ 21,800
Operating Leases, Future Minimum Payments, Due in Five Years			$ 10,900
Lessee, Operating Lease Payment Increase (Decrease) Term, Year			5 years
Lessee, Operating Lease Payment Increase (Decrease), Percentage			1.10
Lessee, Operating Lease, Discount Rate			8.14%
Net Present Value and Operating Lease Liability			$ 141,100
Operating Lease, Payments					10,000	$ 15,000		$ 25,000
Operating lease costs					$ 12,600
Finance Lease, Right-of-Use Asset			$ 166,800
Land Subject to Ground Leases | ft²			25,000
343 Madison Avenue | Consolidated Entities | Scenario, Plan
Lessee, Lease, Description [Line Items]
Recovery of Direct Costs			$ 117,000
343 Madison Avenue | Consolidated Entities | Construction | Scenario, Plan
Lessee, Lease, Description [Line Items]
Net Rentable Area (in sf) | ft²			900,000
Santa Monica Business Park [Member]
Lessee, Lease, Description [Line Items]
Land subject to ground lease, percentage		70.00%
Lessee, Finance Lease, Number of Renewal Terms		4
Lessee, Finance Lease, Renewal Term		11 years
Lessee, Finance Lease, Option to Extend		The ground lease has an expiration date of February 4, 2054 with the option to renew the term for four additional periods of 11 years each, subject to certain conditions.
Lessee, finance lease, payment increase (decrease) frequency (in years)		5 years
Lessee, Finance Lease, Variable Lease Payment, Terms and Conditions		The ground lease requires monthly rental payments with increases every five years, starting in 2028.
Lessee, finance lease, purchase option frequency (in years)		15 years
Lease liabilities - finance leases		$ 163,100
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability		$ 164,100
Interest on lease liabilities				$ 400
Lessee, Finance Lease, Discount Rate		5.79%
Land Subject to Ground Leases | a		47
Net Rentable Area (in sf) | ft²		1,200,000
Santa Monica Business Park [Member] | Ground Lease
Lessee, Lease, Description [Line Items]
Lease Intangibles		$ (46,659)
Santa Monica Business Park [Member] | Ground Lease | Unconsolidated Properties
Lessee, Lease, Description [Line Items]
Lease Intangibles		$ 46,700
Santa Monica Business Park [Member] | Santa Monica Business Park [Member] | Unconsolidated Properties
Lessee, Lease, Description [Line Items]
Ownership Percentage									55.00%

[1] See Note 4.

[2] One of the operating leases relate to assets under development for a portion of the year ended December 31, 2023 and as such, the operating lease costs were capitalized. For December 31, 2022 and 2021, no operating leases related to assets under development.

[3] One, one and two of the finance leases relate to assets under development for all or a portion of the years ended December 31, 2023, December 31, 2022 and December 31, 2021, respectively, and as such, a portion of the interest amount was capitalized.

[4] During the year ended December 31, 2023, the Company completed the acquisition of its joint venture partner’s 45% ownership interest in Santa Monica Business Park, as described below in this Note 6 and Note 3.