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Segment Information (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) segment | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Number of reportable segments | segment | 3 |  |  |
Number of operating segments | segment | 3 |  |  |
Net operating income | $ 298,349 | $ 289,244 |  |
Management and other fees from affiliates | 2,713 | 2,765 |  |
Corporate-level property management expenses | (11,731) | (11,432) |  |
Depreciation and amortization | (139,733) | (136,347) |  |
General and administrative | (17,171) | (15,311) |  |
Expensed acquisition and investment related costs | (68) | (339) |  |
Casualty loss | 0 | (433) |  |
Gain on sale of real estate and land | 0 | 59,238 |  |
Interest expense | (55,933) | (51,045) |  |
Total return swap income | 796 | 1,033 |  |
Interest and other income | 57,275 | 12,450 |  |
Equity income from co-investments | 12,366 | 10,871 |  |
Tax (expense) benefit on unconsolidated co-investments | (49) | 900 |  |
Gain on remeasurement of co-investment | 138,326 | 0 |  |
Net income | 285,140 | 161,594 |  |
Net reportable operating segment - real estate assets | 10,869,727 |  | $ 10,470,292 |
Real estate under development | 24,631 |  | 23,724 |
Co-investments | 1,062,575 |  | 1,061,733 |
Cash and cash equivalents, including restricted cash | 507,870 | 77,158 | 400,334 | $ 42,681
Marketable securities | 91,295 |  | 87,795 |
Notes and other receivables | 183,040 |  | 174,621 |
Operating lease right-of-use assets | 62,858 |  | 63,757 |
Prepaid expenses and other assets | 83,189 |  | 79,171 |
Total assets | 12,885,185 |  | 12,361,427 |
Rental and Other Property Revenues |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | 424,215 | 409,656 |  |
Management and other fees from affiliates |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Management and other fees from affiliates | 2,713 | 2,765 |  |
Operating Segments | Southern California |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net operating income | 124,333 | 116,942 |  |
Net reportable operating segment - real estate assets | 4,208,556 |  | 3,802,648 |
Operating Segments | Southern California | Rental and Other Property Revenues |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | 176,002 | 166,877 |  |
Operating Segments | Northern California |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net operating income | 115,679 | 114,555 |  |
Net reportable operating segment - real estate assets | 5,192,173 |  | 5,242,343 |
Operating Segments | Northern California | Rental and Other Property Revenues |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | 168,839 | 163,728 |  |
Operating Segments | Seattle Metro |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net operating income | 50,916 | 49,894 |  |
Net reportable operating segment - real estate assets | 1,376,656 |  | 1,333,030 |
Operating Segments | Seattle Metro | Rental and Other Property Revenues |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | 71,913 | 70,038 |  |
Other real estate assets |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net operating income | 7,421 | 7,853 |  |
Net reportable operating segment - real estate assets | 92,342 |  | $ 92,271 |
Other real estate assets | Rental and Other Property Revenues |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenues | $ 7,461 | $ 9,013 |  |

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