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Properties Held for Sale and Property Dispositions - Schedule of Properties Sold (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
ft²
Jul. 31, 2024
USD ($)
ft²
Jun. 30, 2024
USD ($)
ft²
Jun. 30, 2023
USD ($)
ft²
Dec. 31, 2022
USD ($)
ft²
Jun. 30, 2022
USD ($)
ft²
May 31, 2022
USD ($)
ft²
Apr. 30, 2022
USD ($)
ft²
Feb. 28, 2022
USD ($)
ft²
Dec. 31, 2024
USD ($)
ft²
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
ft²
Property Dispositions and Assets Held for Sale                        
Employee-related liabilities $ 16,800,000       $ 0         $ 16,800,000 $ 2,000,000 $ 0
Discontinued Operation, Gain (Loss) On Disposal, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag                   investment dispositions investment dispositions investment dispositions
Ownership percentage deconsolidated       50.10%                
Investment fair value adjustment       $ 17,000,000             $ 17,000,000  
885 Third Avenue                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²         218,796             218,796
Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units) (3)                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft² 13,590                 13,590    
Sales price $ 63,500,000                 $ 63,500,000    
(Loss) Gain on Sale (1,500,000)                      
Palisades Premier Conference Center                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²   450,000                    
Sales price   $ 26,300,000                    
(Loss) Gain on Sale   $ 7,300,000                    
719 Seventh Avenue                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²     10,040                  
Sales price     $ 30,500,000                  
(Loss) Gain on Sale     $ (2,000,000.0)                  
245 Park Avenue                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²       1,782,793                
Sales price       $ 1,995,000,000                
(Loss) Gain on Sale       $ (28,300,000)                
Ownership interest disposed       49.90%                
885 Third Avenue                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²         414,317             414,317
Sales price         $ 300,400,000             $ 300,400,000
(Loss) Gain on Sale         (24,000,000.0)              
609 Fifth Avenue                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²           138,563            
Sales price           $ 100,500,000            
(Loss) Gain on Sale           $ (80,200,000)            
1591-1597 Broadway                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²             7,684          
Sales price             $ 121,000,000.0          
(Loss) Gain on Sale             $ (4,500,000)          
1080 Amsterdam Avenue                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²               85,250        
Sales price               $ 42,700,000        
(Loss) Gain on Sale               $ 17,900,000        
707 Eleventh Avenue                        
Property Dispositions and Assets Held for Sale                        
Unaudited Approximate Usable Square Feet | ft²                 159,720      
Sales price                 $ 95,000,000.0      
(Loss) Gain on Sale                 $ (800,000)      
Properties Sold in 2023, 2022, and 2021                        
Property Dispositions and Assets Held for Sale                        
Employee-related liabilities $ 5,100,000       $ 11,200,000         $ 5,100,000 $ 11,300,000 $ 11,200,000