Segment Information - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 11,689,320	$ 11,438,900
Real estate under development	139,161	52,682
Co-investments	808,238	935,014
Cash and cash equivalents, including restricted cash	75,243	75,846	$ 80,263	$ 400,334
Marketable securities	84,116	69,794
Notes and other receivables	221,628	206,706
Operating lease right-of-use assets	51,682	51,556
Prepaid expenses and other assets	80,853	96,861
Total assets	13,150,241	12,927,359
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	4,061,622	4,162,462
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	6,038,112	5,414,689
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	1,426,094	1,460,865
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 163,492	$ 400,884