Segment Information - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 11,800,301	$ 11,904,582
Real estate under development	159,515	157,122
Co-investments	649,313	630,550
Cash and cash equivalents, including restricted cash	47,410	85,586	$ 107,862	$ 75,846
Marketable securities	96,521	98,070
Notes and other receivables	201,982	141,591
Operating lease right-of-use assets	49,957	50,833
Prepaid expenses and other assets	90,488	90,675
Total assets	13,095,487	13,159,009
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	4,146,139	4,194,554
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	6,081,653	6,136,977
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	1,397,771	1,412,405
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 174,738	$ 160,646