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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