Segment Information - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segment - real estate assets	$ 11,054,251	$ 10,470,292
Real estate under development	25,087	23,724
Co-investments	1,007,252	1,061,733
Real estate held for sale	74,148	0
Cash and cash equivalents, including restricted cash	80,263	400,334	$ 400,497	$ 42,681
Marketable securities	75,245	87,795
Notes and other receivables	200,295	174,621
Operating lease right-of-use assets	52,470	63,757
Prepaid expenses and other assets	78,436	79,171
Total assets	12,647,447	12,361,427
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segment - real estate assets	4,142,512	3,802,648
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segment - real estate assets	5,467,730	5,164,643
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segment - real estate assets	1,353,055	1,333,031
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segment - real estate assets	$ 90,954	$ 169,970