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Summary Of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
May 07, 2024
Summary Of Significant Accounting Policies [Line Items]          
Interest capitalized   $ 41,976,000 $ 42,633,000 $ 52,130,000  
Salaries And Related Costs Capitalized   17,200,000 16,100,000 16,100,000  
Cash FDIC Insured Limit   250,000      
Separate Unrestricted Cash For Deferred Compensation Plan. $ 36,100,000 39,400,000 36,100,000    
Gains (losses) from investments in securities   4,416,000 5,556,000 (6,453,000)  
Prepaid Expense and Other Assets 64,230,000 70,839,000 64,230,000    
Unrealized gain (loss) on non-real estate investments   $ 546,000 239,000 (150,000)  
Accounts Receivable, Collection Period Expected   1      
Straight Line Rent Adjustments   $ 105,600,000 99,100,000 108,000,000.0  
Above and below market rent adjustments, net   5,500,000 19,200,000 9,100,000  
Unsecured commercial paper $ 0 500,000,000 0    
Impairment loss   $ 13,615,000 $ 0 0  
REIT Distribution Requirement   90.00%      
Company's Taxable Income Distribution   100.00%      
Accounting Standards Update 2023-05 | Subsequent Event [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Change in Accounting Principle, Accounting Standards Update, Adoption Date   Jan. 01, 2025      
Accounting Standards Update 2023-07          
Summary Of Significant Accounting Policies [Line Items]          
Change in Accounting Principle, Accounting Standards Update, Adoption Date   Jan. 01, 2024      
Interest Rate Cap          
Summary Of Significant Accounting Policies [Line Items]          
Derivative, Number of Instruments Held 2   2    
Derivative, Notional Amount $ 600,000,000   $ 600,000,000    
Losses from interest rate contracts   $ 0 79,000    
Commercial Paper          
Summary Of Significant Accounting Policies [Line Items]          
Unsecured commercial paper   500,000,000      
Unconsolidated Joint Ventures [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Impairment loss on investment [1]   341,338,000 272,603,000 50,705,000  
Straight Line Rent Adjustments   13,700,000 28,700,000 62,900,000  
Above and below market rent adjustments, net   800,000 800,000 400,000  
Shady Grove Innovation District [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Impairment loss   13,600,000      
Number of real estate properties         2
Environmental Focused Investment Fund          
Summary Of Significant Accounting Policies [Line Items]          
Prepaid Expense and Other Assets $ 4,600,000 7,100,000 4,600,000    
Unrealized gain (loss) on non-real estate investments   500,000 200,000 (200,000)  
US Treasury Bill Securities          
Summary Of Significant Accounting Policies [Line Items]          
U.S. Treasury Bill, Term of Contract 3 months        
3-Month United States Treasury Bills $ 302,700,000 0 302,700,000    
Unconsolidated Properties | Unconsolidated Joint Ventures [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Impairment loss on investment   $ 341,300,000 $ 272,600,000 $ 50,700,000  
Unconsolidated Properties | Colorado Center, Gateway Commons and Safeco Plaza          
Summary Of Significant Accounting Policies [Line Items]          
Number of real estate properties   3      
Unconsolidated Properties | Platform Sixteen, Three Six Zero Park Avenue South, Two Zero Zero Fifth Avenue and Safeco Plaza          
Summary Of Significant Accounting Policies [Line Items]          
Number of real estate properties 4   4    
Unconsolidated Properties | Dock 72 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of real estate properties       1  
[1] During the year ended December 31, 2024, the Company recognized an other-than-temporary impairment loss on its investments in Colorado Center, Gateway Commons and Safeco Plaza of approximately $168.4 million, $126.1 million, and $46.8 million, respectively. During the year ended December 31, 2023, the Company recognized an other-than-temporary impairment loss on its investments in Platform 16, 360 Park Avenue South, 200 Fifth Avenue and Safeco Plaza
of approximately $155.2 million, $54.0 million, $33.4 million and $29.9 million, respectively. During the year ended December 31, 2022, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture that owns Dock 72 in Brooklyn, New York totaling approximately $50.7 million.