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Investments in Partially Owned Entities (Schedule of Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Schedule Of Equity Method Investments    
Carrying amount of investments in partially owned entities $ 2,229,224 $ 1,941,278
Carrying amount of investments in partially owned entities $ (68,960) (90,924)
Fifth Avenue and Times Square JV    
Schedule Of Equity Method Investments    
Interest 51.50%  
Carrying amount of investments in partially owned entities $ 1,534,771 1,538,141
Partially owned office buildings/land    
Schedule Of Equity Method Investments    
Carrying amount of investments in partially owned entities $ 404,863 148,958
Alexander's    
Schedule Of Equity Method Investments    
Interest 32.40%  
Carrying amount of investments in partially owned entities $ 80,993 47,276
Other investments    
Schedule Of Equity Method Investments    
Carrying amount of investments in partially owned entities $ 208,597 206,903
7 West 34th Street    
Schedule Of Equity Method Investments    
Interest 53.00%  
Carrying amount of investments in partially owned entities $ (41,895) (65,726)
85 Tenth Avenue    
Schedule Of Equity Method Investments    
Interest 49.90%  
Carrying amount of investments in partially owned entities $ (27,065) $ (25,198)