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Investment in Unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 30, 2025
USD ($)
ft²
Nov. 10, 2025
USD ($)
Oct. 17, 2025
USD ($)
Oct. 16, 2025
USD ($)
Oct. 08, 2025
USD ($)
ft²
Sep. 17, 2025
USD ($)
Aug. 20, 2025
Jun. 27, 2025
USD ($)
apartments
Mar. 05, 2025
USD ($)
ft²
apartments
Feb. 27, 2025
USD ($)
ft²
Dec. 31, 2025
USD ($)
ft²
Real_Estate_Properties
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2025
USD ($)
Aug. 07, 2025
ft²
floor
Schedule of Equity Method Investments [Line Items]                              
Repayments of Secured Debt                     $ 4,251 $ 4,780 $ 0    
Loss from early extinguishment of debt                     338 0 0    
Payments to Acquire Equity Method Investments                     258,752 132,096 192,650    
Gains on sales of real estate                     $ 176,732 602 517    
Construction in Progress                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²                     3,500,000        
Number of real estate properties | Real_Estate_Properties                     8        
Residential Building                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²                     684,500        
Number of real estate properties | Real_Estate_Properties                     7        
Contractual Sale Price                     $ 407,500        
Gains on sales of real estate                     $ 102,860        
Residential Building | Construction in Progress                              
Schedule of Equity Method Investments [Line Items]                              
Number of real estate properties | Real_Estate_Properties                     3        
Mortgages [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Long-Term Debt                     $ 4,298,063        
7750 Wisconsin Avenue LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage                   50.00% 50.00%        
CAB 290 Coles Venture LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage                 19.46%   19.46% [1]        
Payments to Acquire Equity Method Investments                 $ 20,000            
CAB 290 Coles Holdco LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage [1],[2]                     0.00%        
Payments to Acquire Equity Method Investments                     $ 29,900        
CAB 290 Coles Holdco LLC | Maximum [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Payments to Acquire Equity Method Investments                     $ 65,000        
Internal Rate of return on preferred equity                     13.00%        
17 Hartwell Avenue JV LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage               20.00%     20.00% [1]        
Contribution of Property               $ 5,600              
17 Hartwell Avenue JV LLC | Joint Venture Partner [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Payments to Acquire Equity Method Investments               23,000              
360 PAS Holdco LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage                     71.11% [3]       71.11%
360 PAS Holdco LLC | Company's Share [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage                     35.79%        
Podium Venture LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage             50.00%       50.00% [4]        
Office Venture LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage             50.00%       50.00% [4]        
Rosecrans-Sepulveda Partners 4, LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage           50.00%         50.00% [5]        
Gateway Commons Complex [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage [6]                     50.00%        
Equity Method Investment, Other-than-Temporary Impairment                     $ 145,100 126,100      
BP-M 3HB Venture LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage                     25.00%        
Square 407 Limited Partnership [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage [7]                     50.00%        
751 Gateway Holdings LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage [8]                     49.00%        
BNY Tower Holdings LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage [9]                     50.00%        
Unconsolidated Joint Ventures [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Loss from early extinguishment of debt                     $ 171 0 3    
Gains on sales of real estate                     72,818 [10] 0 0    
Equity Method Investment, Other-than-Temporary Impairment [11]                     145,133 341,338 272,603    
Gain on sale / consolidation [12]                     $ 24,261 21,696 28,412    
Unconsolidated Joint Ventures [Member] | 360 PAS Holdco LLC                              
Schedule of Equity Method Investments [Line Items]                              
Equity Method Investment, Other-than-Temporary Impairment                         $ 54,000    
Unconsolidated Properties | BP-M 3HB Venture LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage     25.00%                        
Unconsolidated Properties | Square 407 Limited Partnership [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage   50.00%                          
Gain on sale / consolidation   $ 24,300                          
Unconsolidated Properties | 751 Gateway Holdings LLC                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage 49.00%                            
Unconsolidated Properties | BNY Tower Holdings LLC [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Ownership Percentage         50.00%                    
Unconsolidated Properties | Unconsolidated Joint Ventures [Member] | Gateway Commons Complex [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Equity Method Investment, Other-than-Temporary Impairment                       $ 126,100      
7750 Wisconsin Avenue [Member] | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²                   736,000          
7750 Wisconsin Avenue [Member] | Unconsolidated Properties | Construction Loans                              
Schedule of Equity Method Investments [Line Items]                              
Repayments of Secured Debt                   $ 252,000          
Loss from early extinguishment of debt                   100          
7750 Wisconsin Avenue [Member] | Unconsolidated Properties | Mortgages [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Debt                   $ 252,000          
Debt Instrument, Interest Rate, Stated Percentage                   5.49%          
290 Coles Street | Unconsolidated Properties | Residential Building | Construction in Progress                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²                 560,000            
Number of Units in Real Estate Property | apartments                 670            
290 Coles Street | Unconsolidated Properties | Construction Loans                              
Schedule of Equity Method Investments [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate                 2.50%            
Debt                 $ 225,000            
Extension Option (in years)                 1            
17 Hartwell Avenue                              
Schedule of Equity Method Investments [Line Items]                              
Proceeds from Sale, Real Estate, Held-for-Investment               $ 21,800              
17 Hartwell Avenue | Unconsolidated Properties | Residential Building | Construction in Progress                              
Schedule of Equity Method Investments [Line Items]                              
Number of Units in Real Estate Property | apartments               312              
17 Hartwell Avenue | Unconsolidated Properties | Construction Loans                              
Schedule of Equity Method Investments [Line Items]                              
Debt               $ 98,700              
Debt Instrument, Interest Rate, Stated Percentage               6.75%              
360 Park Avenue South | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²                             450,000
Number of floors | floor                             20
Hub on Causeway - Podium and 100 Causeway Street | Unconsolidated Properties | Construction Loans                              
Schedule of Equity Method Investments [Line Items]                              
Debt                           $ 490,000  
Hub on Causeway - Podium and 100 Causeway Street | Unconsolidated Properties | Mortgages [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Debt                           $ 465,000  
Number of real estate properties                           2  
Debt, Weighted Average Interest Rate                           5.733%  
100 Causeway Street | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²                     634,000        
100 Causeway Street | Unconsolidated Properties | Extended Maturity | Construction Loans                              
Schedule of Equity Method Investments [Line Items]                              
Debt Instrument, Maturity Date             Oct. 20, 2025                
Hub on Causeway - Podium | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²                     383,000        
Hub on Causeway - Podium | Unconsolidated Properties | Extended Maturity | Construction Loans                              
Schedule of Equity Method Investments [Line Items]                              
Debt Instrument, Maturity Date             Oct. 23, 2025                
Beach Cities Media Campus | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Contractual Sale Price           $ 56,000                  
Gains on sales of real estate           5,100                  
Proceeds from Sale, Real Estate, Other, Held-for-Investment           53,100                  
Beach Cities Media Campus | Unconsolidated Properties | Company's Share [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Gains on sales of real estate           2,600                  
Proceeds from Sale, Real Estate, Other, Held-for-Investment           $ 26,600                  
Dock 72 [Member] | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft²         669,000                    
Debt Instrument, Basis Spread on Variable Rate         2.50%                    
Debt Instrument, Maturity Date         Dec. 18, 2025                    
Repayments of Secured Debt         $ 198,400                    
Loss from early extinguishment of debt         $ 100                    
3 Hudson Boulevard [Member] | Affiliated Entity | Scenario, Plan                              
Schedule of Equity Method Investments [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate     7.25%                        
3 Hudson Boulevard [Member] | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate       3.61%                      
Repayments of Secured Debt       $ 80,000                      
Debt Instrument, Increase, Accrued Interest       $ 51,400                      
Debt Instrument, Interest Rate, Increase (Decrease)       4.00%                      
3 Hudson Boulevard [Member] | Unconsolidated Properties | Senior Loans                              
Schedule of Equity Method Investments [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate     5.25%                        
Debt     $ 108,000                        
Debt Instrument, Maturity Date     Nov. 09, 2027                        
Extension Option (in years)     1                        
3 Hudson Boulevard [Member] | Unconsolidated Properties | Subordinated Debt                              
Schedule of Equity Method Investments [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate     7.25%                        
Debt                     $ 18,400        
Debt Instrument, Maturity Date     Nov. 09, 2027                        
Extension Option (in years)     1                        
3 Hudson Boulevard [Member] | Unconsolidated Properties | Maximum [Member] | Subordinated Debt                              
Schedule of Equity Method Investments [Line Items]                              
Debt     $ 50,000                        
Market Square North | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Debt   $ 125,000                          
751 Gateway Boulevard | Unconsolidated Properties                              
Schedule of Equity Method Investments [Line Items]                              
Net Rentable Area (in sf) | ft² 231,000                            
Contractual Sale Price $ 300,000                            
Gains on sales of real estate 67,700                            
Proceeds from Sale of Buildings 292,800                            
751 Gateway Boulevard | Unconsolidated Properties | Company's Share [Member]                              
Schedule of Equity Method Investments [Line Items]                              
Gains on sales of real estate 27,000                            
Proceeds from Sale of Buildings $ 143,500                            
[1] This entity is a VIE (See Note 2).
[2] The Company agreed to fund up to $65.0 million of the required capital through its preferred equity investment. The Company’s preferred equity investment will earn and accrue a 13.0% internal rate of return (“IRR”) and is to be redeemed, in full, upon the earlier of two years after stabilization of the property or March 5, 2030.
[3] The Company’s ownership includes (1) a 35.79% direct interest in the joint venture, (2) an additional 35.02% indirect ownership in the joint venture, and (3) an additional 1.0% interest in the entity through which the partner owns its interest in the joint venture.
[4] In conjunction with the execution of the mortgage loan on September 30, 2025 (described below), Podium Venture LLC and Office Venture LLC were created for structuring purposes and did not change any of the partner rights previously held by the partners of Podium Developer LLC or Office Tower Developer LLC, respectively.
[5] On September 17, 2025, the joint venture completed the sale of the land parcel.
[6] During the year ended December 31, 2025, the Company recognized an other-than-temporary impairment loss on its investment. On January 2, 2026, the Company completed the sale of its ownership interest in the joint venture (See Note 17).
[7] On November 10, 2025, the Company completed the sale of its ownership interest in the joint venture.
[8] On December 30, 2025, the joint venture completed the sale of the property.
[9] This investment includes net equity balances from the amenity joint venture. The amenity joint venture had a deficit balance of approximately $0.4 million at December 31, 2025.
[10] During the year ended December 31, 2025, gains on sales of real estate included Beach Cities Media Campus and 751 Gateway.
[11] During the year ended December 31, 2025, the Company recognized an other-than-temporary impairment loss on its investment in Gateway Commons of approximately $145.1 million. 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.
[12] During the year ended December 31, 2025, the Company completed the sale of its investment in Market Square North. During the year ended December 31, 2024, the Company acquired its joint venture partner’s 50% economic interest in 901 New York Avenue. During the year ended December 31, 2023, the Company acquired its joint venture partner’s 45% ownership interest in Santa Monica Business Park.