Quarterly report [Sections 13 or 15(d)]

INVESTMENTS IN RENTAL PROPERTIES - Narrative (Details)

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INVESTMENTS IN RENTAL PROPERTIES - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Apr. 21, 2025
Apr. 30, 2025
Jan. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Real Estate Properties [Line Items]            
Mortgage loan       $ 332,813    
In-place lease values, related intangibles and other assets, net       9,418   $ 9,519
Unconsolidated Joint Venture Office Buildings | The Metropolitan at 40 Park            
Real Estate Properties [Line Items]            
Proceeds from the sales of rental property   $ 500        
Gain on sale of investments       200    
Unconsolidated Joint Venture Office Buildings | Lofts At 40 Park Property            
Real Estate Properties [Line Items]            
Proceeds from the sales of rental property     $ 30,300      
Gain on sale of investments         $ 7,100  
Unconsolidated Joint Venture Office Buildings | Urby at Harborside            
Real Estate Properties [Line Items]            
Purchase of unconsolidated joint venture interest $ 38,500          
Mortgage loan $ 181,800          
Unconsolidated Joint Venture Office Buildings | Urby at Harborside | Sable JV Interest Acquisition            
Real Estate Properties [Line Items]            
Assets acquired percentage 15.00%          
Preacquisition equity interest percentage 85.00%          
Transaction costs capitalized $ 2,100          
In-place lease values, related intangibles and other assets, net 2,200          
Mortgages, loans payable and other obligations, net 181,000          
Unconsolidated Joint Venture Office Buildings | Urby at Harborside | Sable JV Interest Acquisition | Land            
Real Estate Properties [Line Items]            
Property, plant and equipment $ 267,300          
Multifamily | PI North - Land            
Real Estate Properties [Line Items]            
Proceeds from the sales of rental property   $ 6,600        
Gain on sale of investments       4,900    
Mortgage loan       0    
Multifamily | Urby at Harborside            
Real Estate Properties [Line Items]            
Mortgage loan       $ 0