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Segment Information - Schedule of Reconciliation of Revenues and Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]    
Rental and other property revenue $ 482,443 $ 462,089
Property operating expenses, including real estate taxes 141,256 138,621
Net operating income 341,187 323,468
Management and other fees from affiliates 2,313 2,494
Corporate-level property management expenses (13,398) (12,332)
Depreciation and amortization (154,895) (151,287)
General and administrative (20,014) (16,292)
Gain on sale of real estate and land 0 111,030
Interest expense (65,564) (62,732)
Total return swap income 1,542 1,200
Interest and other income 1,036 4,289
Equity income from co-investments 23,615 13,209
Tax (expense) benefit on unconsolidated technology co-investments (3,614) 163
Loss on early retirement of debt 0 (762)
Gain on remeasurement of co-investment 0 330
Net income 112,208 212,778
Operating Segments | Southern California    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Rental and other property revenue 195,305 188,622
Property operating expenses, including real estate taxes 57,622 54,630
Net operating income 137,683 133,992
Operating Segments | Northern California    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Rental and other property revenue 201,618 180,916
Property operating expenses, including real estate taxes 60,347 56,146
Net operating income 141,271 124,770
Operating Segments | Seattle Metro    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Rental and other property revenue 79,021 77,214
Property operating expenses, including real estate taxes 23,080 23,902
Net operating income 55,941 53,312
Other real estate assets    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Rental and other property revenue 6,499 15,337
Property operating expenses, including real estate taxes 207 3,943
Net operating income $ 6,292 $ 11,394