Annual report pursuant to Section 13 and 15(d)

INVESTMENTS IN RENTAL PROPERTY- Schedule of Disposed Developable Land (Details)

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INVESTMENTS IN RENTAL PROPERTY- Schedule of Disposed Developable Land (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds $ 75,118 $ 151,666 $ 5,011
Net Carrying Value 30,468 94,404 2,896
Realized Gains (losses)/ Unrealized Losses, net 7,068 57,262 2,115
Discontinued Operations Realized Gains (losses)/ Unrealized Losses, net 39,271    
Columbia-Honeywell      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 8,214    
Net Carrying Value 8,236    
Realized Gains (losses)/ Unrealized Losses, net (22)    
Discontinued Operations Realized Gains (losses)/ Unrealized Losses, net 0    
Deposits received 1,100    
3 Campus      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 13,248    
Net Carrying Value 7,847    
Realized Gains (losses)/ Unrealized Losses, net 5,401    
Discontinued Operations Realized Gains (losses)/ Unrealized Losses, net 0    
Harborside 4      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 53,656    
Net Carrying Value 14,385    
Realized Gains (losses)/ Unrealized Losses, net 0    
Discontinued Operations Realized Gains (losses)/ Unrealized Losses, net 39,271    
Other Properties      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Realized Gains (losses)/ Unrealized Losses, net 1,689    
Discontinued Operations Realized Gains (losses)/ Unrealized Losses, net $ 0    
Palladium residential land      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   23,908  
Net Carrying Value   24,182  
Realized Gains (losses)/ Unrealized Losses, net   (274)  
Palladium commercial land      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   4,688  
Net Carrying Value   1,791  
Realized Gains (losses)/ Unrealized Losses, net   2,897  
Port Imperial Park parcel      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   29,331  
Net Carrying Value   29,744  
Realized Gains (losses)/ Unrealized Losses, net   (413)  
Urby II/III      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   68,854  
Net Carrying Value   13,316  
Realized Gains (losses)/ Unrealized Losses, net   55,538  
Port Imperial Parcels 3 & 16      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds   24,885  
Net Carrying Value   25,371  
Realized Gains (losses)/ Unrealized Losses, net   (486)  
Non-cash expenses   $ 2,500  
Horizon common area      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds     745
Net Carrying Value     634
Realized Gains (losses)/ Unrealized Losses, net     111
346/360 University Ave      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds     4,266
Net Carrying Value     2,262
Realized Gains (losses)/ Unrealized Losses, net     $ 2,004