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Investments in Unconsolidated Real Estate Entities (Investment in PSB) (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 20, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from sale of equity investment in PS Business Parks, Inc. |  |  |  | $ 0 | $ 2,636,011
Gain on sale of equity investment in PS Business Parks, Inc. |  | $ 0 | $ 2,128,860 | 0 | 2,128,860
Cash distribution received |  |  |  | $ 17,663 | 134,460
PSB |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest (percentage) | 41.00% |  |  |  |
Cash distribution received |  |  |  |  | $ 109,500
PSB | Blackstone Real Estate |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from sale of equity investment in PS Business Parks, Inc. | $ 2,700,000 |  |  |  |
Gain on sale of equity investment in PS Business Parks, Inc. |  |  | $ 2,100,000 |  |

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