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, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds $ 88,770 $ 75,118 $ 151,666
Net Carrying Value 77,255 30,468 94,404
Gain (loss) on disposition of developable land 11,515 7,068 57,262
Discontinued Operations Realized gains (losses) and unrealized gains (losses) on disposition of rental property and impairments, net   39,271  
2 Campus      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 10,155    
Net Carrying Value 9,371    
Gain (loss) on disposition of developable land 784    
107 Morgan      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 50,630    
Net Carrying Value 50,929    
Gain (loss) on disposition of developable land (299)    
Impairment charges 10,500    
6 Becker Farm / 85 Livingston      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net Sales Proceeds 27,985    
Net Carrying Value 16,955    
Gain (loss) on disposition of developable land $ 11,030    
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  
Gain (loss) on disposition of developable land   (22)  
Discontinued Operations Realized gains (losses) and unrealized gains (losses) on disposition of rental property and impairments, 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  
Gain (loss) on disposition of developable land   5,401  
Discontinued Operations Realized gains (losses) and unrealized gains (losses) on disposition of rental property and impairments, 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  
Gain (loss) on disposition of developable land   0  
Discontinued Operations Realized gains (losses) and unrealized gains (losses) on disposition of rental property and impairments, net   39,271  
Other Properties      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain (loss) on disposition of developable land   1,689  
Discontinued Operations Realized gains (losses) and unrealized gains (losses) on disposition of rental property and impairments, 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
Gain (loss) on disposition of developable land     (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
Gain (loss) on disposition of developable land     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
Gain (loss) on disposition of developable land     (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
Gain (loss) on disposition of developable land     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
Gain (loss) on disposition of developable land     (486)
Non-cash expenses     $ 2,500