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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
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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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