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Fair Value Measurements - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2025
USD ($)
Jul. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]                  
Charge related to fair value adjustment       $ 17,000          
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate             $ 86,068 $ 208,144 $ (13,368)
Investments in unconsolidated joint ventures         $ 2,624,755   2,624,755 2,690,138  
Cash consideration             $ 182,737 $ 451,233 $ 184,481
Preferred Equity | 625 Madison Avenue                  
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]                  
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate           $ (14,500)      
Joint venture sold (as a percent)   0.500              
Cash consideration   $ 23,700              
800 Third Avenue Joint Venture                  
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]                  
Charge related to fair value adjustment $ 20,200                
Ownership interest (as a percent) 39.50%                
Madison Avenue, 625, Transaction 1                  
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]                  
Joint venture sold (as a percent)   0.500              
Sale of preferred equity investment   $ 104,900              
Investments in unconsolidated joint ventures           $ 112,100      
Madison Avenue, 625, Transaction 2                  
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]                  
Joint venture sold (as a percent)   0.500              
Sale of preferred equity investment   $ 10,900              
Cash consideration   $ 23,700              
10 East 53rd Street                  
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]                  
Charge related to fair value adjustment     $ (55,700)            
Ownership interest (as a percent)     45.00%            
Investments in unconsolidated joint ventures     $ 7,200            
100 Park Avenue                  
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]                  
Ownership interest disposed (in percent)         49.00%   49.00%    
Gross asset valuation         $ 425,000   $ 425,000    
Charge related to fair value adjustment         $ 23,500