Segment Information - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 11,605,918	$ 11,438,900
Real estate under development	96,268	52,682
Co-investments	906,686	935,014
Real estate held for sale	112,173	0
Cash and cash equivalents, including restricted cash	107,862	75,846	$ 507,870	$ 400,334
Marketable securities	76,013	69,794
Notes and other receivables	133,724	206,706
Operating lease right-of-use assets	53,351	51,556
Prepaid expenses and other assets	94,263	96,861
Total assets	13,186,258	12,927,359
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	4,124,581	4,275,506
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	5,875,927	5,501,160
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	1,447,563	1,460,865
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 157,847	$ 201,369