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SALES OF PROPERTIES AND PROPERTY HELD FOR SALE (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 | Jun. 17, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 30, 2021 | Dec. 31, 2020
Sale of Property |  |  |  |  |  |  |  |
Repayment of mortgages payable |  |  |  |  | $ 18,832,000 | $ 3,332,000 |  |
Prepayment costs on debt related to real estate |  |  | $ 799,000 | $ 775,000 | 799,000 | 1,065,000 |  |
Property held-for-sale |  |  | 6,446,000 |  | 6,446,000 |  |  |
Properties disposed of by sale | Retail property and parking lot, West Hartford, Connecticut |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Proceeds from sale of real estate, net of closing costs |  | $ 39,491,000 |  |  |  |  |  |
Gain on Sale of Real Estate, Net |  |  | 21,491,000 |  | 21,491,000 |  |  |
Repayment of mortgages payable |  | 15,403,000 |  |  |  |  |  |
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net |  | 1,148,000 |  |  |  |  |  |
Write-off of the unamortized intangible lease liability |  | $ 967,000 |  |  |  |  |  |
Properties disposed of by sale | Retail property and parking lot, West Hartford, Connecticut | Prepayment costs on debt |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Prepayment costs on debt related to a swap termination fee |  |  | 799,000 |  | 799,000 |  |  |
Properties disposed of by sale | Retail property, Onalaska, Wisconsin |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Proceeds from sale of real estate, net of closing costs |  |  |  |  |  | 7,093,000 |  |
Gain on Sale of Real Estate, Net |  |  |  |  |  | 4,252,000 |  |
Repayment of mortgages payable |  |  |  |  |  | 3,332,000 |  |
Write-off of unbilled rent receivable, as a reduction to Gain on sale of real estate, net |  |  |  |  |  | 170,000 |  |
Properties disposed of by sale | Retail property, Onalaska, Wisconsin | Prepayment costs on debt |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Prepayment costs on debt related to real estate |  |  |  |  |  | $ 290,000 |  |
Properties disposed of by sale | Retail property located in Philadelphia, Pennsylvania |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Gain on Sale of Real Estate, Net | $ 1,299,000 |  |  |  |  |  |  |
Non-controlling interest's share of the gain | 130,000 |  |  |  |  |  |  |
Repayment of mortgages payable | $ 3,574,000 |  |  |  |  |  |  |
Properties held-for-sale | Retail property located in Philadelphia, Pennsylvania |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Contracted gross sales price |  |  |  |  |  |  | $ 8,300,000 |
Property held-for-sale |  |  | 6,446,000 |  | 6,446,000 |  |  |
Consolidated Joint Venture-VIEs |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Property held-for-sale |  |  | $ 6,446,000 |  | $ 6,446,000 |  |  | $ 0
Consolidated Joint Venture-VIEs | Properties held-for-sale | Retail property located in Philadelphia, Pennsylvania |  |  |  |  |  |  |  |
Sale of Property |  |  |  |  |  |  |  |
Ownership interest in consolidated joint venture of the company (as a percent) |  |  |  |  |  |  | 90.00% |

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