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Investments in Partially Owned Entities (Alexander's Inc.) (Details) - Alexander's - USD ($) $ / shares in Units, $ in Thousands	May 28, 2026	Jun. 30, 2026
Schedule Of Equity Method Investments
Equity method ownership percentage		32.40%
Rego Park 1 Property
Schedule Of Equity Method Investments
Proceeds from sale of property	$ 235,500
Net gain on sale	44,329
Proceeds from commissions received	2,355
Sales commissions and fees	$ 500
Equity Method Investee
Schedule Of Equity Method Investments
Ownership common shares, investee (in shares)		1,654,068
Equity method ownership percentage		32.40%
Closing share price (in dollars per share)		$ 275.56
Equity method investment fair value		$ 455,795
Excess of investee's fair value over carrying amount		374,802
Excess of investee's carrying amount over equity in net assets		$ 25,221

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