| Recent Transactions (Tables)
 | 3 Months Ended | 
| Mar. 31, 2022 | 
|---|
| Real Estate Properties [Line Items] |  | 
| Schedule Of Real Estate Held For Sale/Discontinued Operations/Dispositions | The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands):     
|   |   |   |   |  
|   |   | Assets |   |  
|   |   | Held for Sale |   |  
| Land | $ |  142,212 |   |  
| Building & Other |   |  398,288 |   |  
| Less: Accumulated depreciation |   |  (128,442) |   |  
| Real estate held for sale, net | $ |  412,058 |   |     
|   |   |   |   |  
|   |   | Assets |   |  
| Other assets and liabilities |   | Held for Sale |   |  
| Unbilled rents receivable, net (a) | $ |  15,894 |   |  
| Deferred charges, net (a) |   |  12,637 |   |  
| Total deferred charges & other assets, net |   |  15,573 |   |  
| Mortgages & loans payable, net (a) |   |  (249,106) |   |  
| Accounts payable, accrued exp & other liability |   |  3,833 |   |  
| Unearned rents/deferred rental income (a) |   |  (3,694) |   |   (a)Expected to be removed with the completion of the sales. | 
| Schedule Of Real Estate Properties Sold And Disposed | The Company disposed of the following rental property during the three months ended March 31, 2022 (dollars in thousands):     
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | Realized |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | Gains |  
|   |   |   |   |   | Rentable |   |   |   | Net |   |   | Net |   |   | (Losses)/ |  
| Disposition |   |   | # of |   | Square |   | Property  |   | Sales |   |   | Carrying |   |   | Unrealized |  
| Date | Property/Address | Location | Bldgs. |   | Feet |   | Type |   | Proceeds |   |   | Value |   |   | Losses, net |  
| 01/21/22 | 111 River  Street | Hoboken, New Jersey | 1 |   | 566,215 |   | Office | $ | 208,268 | (a) | $ | 206,432 |   | $ |  1,836 |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Totals |   |   | 1 |   | 566,215 |   |   | $ | 208,268 |   | $ | 206,432 |   | $ |  1,836 |  (a)The mortgage loan encumbering the property was repaid at closing, for which the Company incurred costs of $6.3 million.  These costs were expensed as loss from extinguishment of debt during the three months ended March 31, 2022. | 
| Schedule Of Disposed Developable Land | The Company disposed of the following developable land holdings during the three months ended March 31, 2022 (dollars in thousands):     
|   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |   |   | Realized |  
|   |   |   |   |   |   |   |   |   |   |   | Gains |  
|   |   |   |   |   | Net |   |   | Net |   |   | (Losses)/ |  
| Disposition |   |   |   |   | Sales |   |   | Carrying |   |   | Unrealized |  
| Date | Property Address | Location |   |   | Proceeds |   |   | Value |   |   | Losses, net |  
| 03/22/22 | Palladium residential land | West Windsor, New Jersey |   | $ | 23,908 |   | $ | 24,182 |   | $ |  (274) |  
| 03/22/22 | Palladium commercial land | West Windsor, New Jersey |   |   | 4,688 |   |   | 1,791 |   |   |  2,897 |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Totals |   |   |   | $ | 28,596 |   |   | 25,973 |   |   | 2,623 |  | 
| VERIS RESIDENTIAL, L.P. [Member] |  | 
| Real Estate Properties [Line Items] |  | 
| Schedule Of Real Estate Held For Sale/Discontinued Operations/Dispositions | The following table summarizes the real estate held for sale, net, and other assets and liabilities (dollars in thousands):     
|   |   |   |   |  
|   |   | Assets |   |  
|   |   | Held for Sale |   |  
| Land | $ |  142,212 |   |  
| Building & Other |   |  398,288 |   |  
| Less: Accumulated depreciation |   |  (128,442) |   |  
| Real estate held for sale, net | $ |  412,058 |   |     
|   |   |   |   |  
|   |   | Assets |   |  
| Other assets and liabilities |   | Held for Sale |   |  
| Unbilled rents receivable, net (a) | $ |  15,894 |   |  
| Deferred charges, net (a) |   |  12,637 |   |  
| Total deferred charges & other assets, net |   |  15,573 |   |  
| Mortgages & loans payable, net (a) |   |  (249,106) |   |  
| Accounts payable, accrued exp & other liability |   |  3,833 |   |  
| Unearned rents/deferred rental income (a) |   |  (3,694) |   |   (a)Expected to be removed with the completion of the sales. | 
| Schedule Of Real Estate Properties Sold And Disposed | The Company disposed of the following rental property during the three months ended March 31, 2022 (dollars in thousands):     
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | Realized |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | Gains |  
|   |   |   |   |   | Rentable |   |   |   | Net |   |   | Net |   |   | (Losses)/ |  
| Disposition |   |   | # of |   | Square |   | Property  |   | Sales |   |   | Carrying |   |   | Unrealized |  
| Date | Property/Address | Location | Bldgs. |   | Feet |   | Type |   | Proceeds |   |   | Value |   |   | Losses, net |  
| 01/21/22 | 111 River  Street | Hoboken, New Jersey | 1 |   | 566,215 |   | Office | $ | 208,268 | (a) | $ | 206,432 |   | $ |  1,836 |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Totals |   |   | 1 |   | 566,215 |   |   | $ | 208,268 |   | $ | 206,432 |   | $ |  1,836 |  (a)The mortgage loan encumbering the property was repaid at closing, for which the Company incurred costs of $6.3 million.  These costs were expensed as loss from extinguishment of debt during the three months ended March 31, 2022. | 
| Schedule Of Disposed Developable Land | The Company disposed of the following developable land holdings during the three months ended March 31, 2022 (dollars in thousands):     
|   |   |   |   |   |   |   |   |   |   |   |   |  
|   |   |   |   |   |   |   |   |   |   |   | Realized |  
|   |   |   |   |   |   |   |   |   |   |   | Gains |  
|   |   |   |   |   | Net |   |   | Net |   |   | (Losses)/ |  
| Disposition |   |   |   |   | Sales |   |   | Carrying |   |   | Unrealized |  
| Date | Property Address | Location |   |   | Proceeds |   |   | Value |   |   | Losses, net |  
| 03/22/22 | Palladium residential land | West Windsor, New Jersey |   | $ | 23,908 |   | $ | 24,182 |   | $ |  (274) |  
| 03/22/22 | Palladium commercial land | West Windsor, New Jersey |   |   | 4,688 |   |   | 1,791 |   |   |  2,897 |  
|   |   |   |   |   |   |   |   |   |   |   |   |  
| Totals |   |   |   | $ | 28,596 |   |   | 25,973 |   |   | 2,623 |  |