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Investment in Unconsolidated Joint Ventures (Narrative) (Details)
$ in Thousands
 3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Sep. 17, 2025
USD ($)
Aug. 20, 2025
Jun. 27, 2025
USD ($)
ft²
apartments
Mar. 05, 2025
USD ($)
ft²
apartments
Feb. 27, 2025
USD ($)
ft²
Sep. 30, 2025
USD ($)
ft²
Real_Estate_Properties
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
ft²
Real_Estate_Properties
Sep. 30, 2025
USD ($)
ft²
Real_Estate_Properties
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Aug. 07, 2025
ft²
floor
Schedule of Equity Method Investments [Line Items]                        
Repayments of Secured Debt                 $ 3,195 $ 3,461    
Loss from early extinguishment of debt           $ 0 $ 0   338 0    
Payments to Acquire Equity Method Investments                 118,524 87,498    
Gains on sales of real estate           $ 1,932 517   $ 20,322 517    
Residential Building                        
Schedule of Equity Method Investments [Line Items]                        
Number of real estate properties | Real_Estate_Properties           9   9 9      
7750 Wisconsin Avenue LLC [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Ownership Percentage         50.00% 50.00%   50.00% 50.00%      
CAB 290 Coles Venture LLC                        
Schedule of Equity Method Investments [Line Items]                        
Ownership Percentage       19.46%   19.46% [1]   19.46% [1] 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%   0.00% 0.00%      
Payments to Acquire Equity Method Investments               $ 11,900        
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]   20.00% [1] 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% [3] 71.11% [3]     71.11%
Podium Venture LLC [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Ownership Percentage   50.00%       50.00% [4]   50.00% [4] 50.00% [4]      
Office Venture LLC                        
Schedule of Equity Method Investments [Line Items]                        
Ownership Percentage   50.00%       50.00% [4]   50.00% [4] 50.00% [4]      
Rosecrans-Sepulveda Partners 4, LLC                        
Schedule of Equity Method Investments [Line Items]                        
Ownership Percentage 50.00%         50.00% [5]   50.00% [5] 50.00% [5]      
Gateway Commons Complex [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Ownership Percentage [6]           50.00%   50.00% 50.00%      
Equity Method Investment, Other-than-Temporary Impairment           $ 145,100     $ 145,100   $ 126,100  
Gateway Commons Complex [Member] | Maximum [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Other than Temporary Impairment Losses, Equity Method Investments, Capitalization Rate           7.50%            
Other than Temporary Impairment Losses, Equity Method Investments, Discount Rate           11.00%            
Gateway Commons Complex [Member] | Minimum [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Other than Temporary Impairment Losses, Equity Method Investments, Capitalization Rate           6.50%            
Other than Temporary Impairment Losses, Equity Method Investments, Discount Rate           10.00%            
Unconsolidated Joint Ventures [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Loss from early extinguishment of debt           $ 0 0   62 0    
Gains on sales of real estate           4,762 [7] 0   4,762 [7] 0    
Equity Method Investment, Other-than-Temporary Impairment           145,133 [8] $ 0   145,133 [8] $ 0    
Unconsolidated Joint Ventures [Member] | Rosecrans-Sepulveda Partners 4, LLC                        
Schedule of Equity Method Investments [Line Items]                        
Gains on sales of real estate           2,200            
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                        
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]                        
Net Rentable Area (in sf) | ft²     30,000                  
Proceeds from Sale, Real Estate, Held-for-Investment     $ 21,800                  
Gains on sales of real estate                 18,400      
17 Hartwell Avenue | Unconsolidated Properties | Residential Building                        
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   $ 490,000 490,000      
Hub on Causeway - Podium and 100 Causeway Street | Unconsolidated Properties | Mortgages [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Debt           $ 465,000   $ 465,000 $ 465,000      
Debt, Weighted Average Interest Rate           5.733%   5.733% 5.733%      
100 Causeway Street | Unconsolidated Properties                        
Schedule of Equity Method Investments [Line Items]                        
Net Rentable Area (in sf) | ft²           634,000   634,000 634,000      
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   383,000 383,000      
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 4,800                      
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 2,200                      
Proceeds from Sale, Real Estate, Other, Held-for-Investment $ 26,600                      
[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 signed 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 Beach Cities Media Campus, a land parcel, located in El Segundo, California.
[6] During the three months ended September 30, 2025, the Company recognized an other-than-temporary impairment loss on its investment.
[7] During the three and nine months ended September 30, 2025, the joint venture recorded a gain on sale of real estate related to the Beach Cities Media Campus. As a result of the historical basis difference, the Company recognized a gain on sale of real estate totaling approximately $2.2 million, which consists of its share of the gain on sale reported by the joint venture as well as an adjustment for a basis differential.
[8] During the three and nine months ended September 30, 2025, the Company recognized an other-than-temporary impairment loss on its investment in Gateway Commons of approximately $145.1 million.