Revenues - Schedule of Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) community	Mar. 31, 2025 USD ($)
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	$ 482,443	$ 462,089
Management and other fees from affiliates	2,313	2,494
Total revenues	$ 484,756	464,583
Apartment communities owned (in communities) | community	259
Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	$ 195,305	188,622
Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	201,618	180,916
Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	79,021	77,214
Other real estate assets
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	6,499	15,337
Rental income
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	475,812	455,860
Other property
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	6,631	6,229
Total rental and other property revenues
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	482,443	462,089
Total rental and other property revenues | Same-property
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	$ 442,572	430,009
Occupancy threshold for classification as stabilized	90.00%
Total rental and other property revenues | Acquisitions
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	$ 20,761	4,570
Total rental and other property revenues | Non-residential/other, net
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	$ 19,225	27,898
Apartment communities owned (in communities) | community	2
Total rental and other property revenues | Straight line rent concession
Disaggregation of Revenue [Line Items]
Straight line rent concession	$ (115)	(388)
Total rental and other property revenues | Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	195,305	188,622
Total rental and other property revenues | Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	201,618	180,916
Total rental and other property revenues | Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	79,021	77,214
Total rental and other property revenues | Other real estate assets
Disaggregation of Revenue [Line Items]
Total rental and other property revenues	$ 6,499	$ 15,337