v3.26.3
Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Parenthetical) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2023
Dec. 31, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]              
Note receivable from related party $ 208,535   $ 208,535     $ 154,892  
Allowance for credit losses 2,781   $ 2,781     1,638 $ 2,004
Basis spread on variable rate     1.00%        
Interest income 4,546 $ 6,121 $ 15,891 $ 18,575      
Impairment charge     600        
Equity in (losses) earnings of unconsolidated affiliates (467) (3,694) 11,954 (9,598)      
Related Party [Member]              
Schedule of Equity Method Investments [Line Items]              
Note receivable from related party 14,400   14,400     14,300  
REIT Portfolio              
Schedule of Equity Method Investments [Line Items]              
Equity method investments 86,959   $ 86,959     84,561  
1238 Wisconsin Avenue              
Schedule of Equity Method Investments [Line Items]              
Debt Instrument, Description of Variable Rate Basis     The loan is secured by the venture members’ equity interest in the entity that owns the 1238 Wisconsin development property, bears interest at Prime + 1.0% (subject to a 4.5% floor), and matures on December 28, 2027.        
1238 Wisconsin Avenue | REIT Portfolio              
Schedule of Equity Method Investments [Line Items]              
Construction commitment 12,800   $ 12,800        
Note receivable from related party 12,800   12,800     12,800  
Allowance for credit losses 100   100     100  
Interest income $ 100 $ 100 $ 100 $ 100      
Equity method investment, ownership percentage [1],[2] 80.00%   80.00%        
Equity method investments [1],[2] $ 17,192   $ 17,192     18,025  
840 N. Michigan Avenue              
Schedule of Equity Method Investments [Line Items]              
Note receivable from related party $ 2,100   $ 2,100     $ 1,800  
Note receivable maturity date     Dec. 31, 2026        
Equity in (losses) earnings of unconsolidated affiliates         $ 400    
Fund IV              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage 23.12%   23.12%        
Fund V              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage 20.10%   20.10%        
Shops at Skyview              
Schedule of Equity Method Investments [Line Items]              
Interest income $ 600   $ 1,800        
Equity method investment, ownership percentage 7.50%   7.50%        
Shops at Skyview | Preferred Stock [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity method investments $ 41,700   $ 41,700        
Shops at Skyview | Preferred Stock [Member] | Related Party [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity method investments 400   400        
Power Center              
Schedule of Equity Method Investments [Line Items]              
Interest income $ 300   $ 800        
Equity method investment, ownership percentage 6.00%   6.00%        
Power Center | Preferred Stock [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity method investments $ 27,500   $ 27,500        
Power Center | Preferred Stock [Member] | Related Party [Member]              
Schedule of Equity Method Investments [Line Items]              
Unamortized discount 1,900   1,900        
Equity method investments $ 200   200        
Fifth Wall              
Schedule of Equity Method Investments [Line Items]              
Impairment charge     $ 600        
[1] Includes the amounts advanced against a $12.8 million construction commitment from the Company to the venture that holds its investment in 1238 Wisconsin. As of September 30, 2026 and December 31, 2025 the related party note receivable had a principal balance of $12.8 million, net of a $0.1 million allowance at each period. The loan is secured by the venture members’ equity interest in the entity that owns the 1238 Wisconsin development property, bears interest at Prime + 1.0% (subject to a
4.5% floor), and matures on December 28, 2027. The Company recognized interest income of $0.1 million for each of the three and nine months ended September 30, 2026 and 2025, related to this note receivable, which is recorded in Interest income in the Company’s Condensed Consolidated Statements of Operations.
[2] Represents a VIE for which the Company is not the primary beneficiary (Note 15).