Segment Information - Total Assets from Reportable Operating Segments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 11,438,900	$ 10,470,292
Real estate under development	52,682	23,724
Co-investments	935,014	1,061,733
Cash and cash equivalents, including restricted cash	75,846	400,334	$ 42,681	$ 58,638
Marketable securities	69,794	87,795
Notes and other receivables	206,706	174,621
Operating lease right-of-use assets	51,556	63,757
Prepaid expenses and other assets	96,861	79,171
Total assets	12,927,359	12,361,427
Operating segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	4,290,547	3,763,745
Operating segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	5,501,160	5,124,987
Operating segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	1,460,865	1,316,421
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net reportable operating segments - real estate assets	$ 186,328	$ 265,139