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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
FAIR VALUE MEASUREMENTS |
Schedule of carrying amounts and estimated fair value of debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Carrying Amount |  | Estimated Fair Value |
Mortgage Notes Payable | ​ | ​ | ​ | ​ | ​ | ​ | ​
Partnership Properties | ​ | ​ | ​ | ​ | ​ | ​ | ​
At December 31, 2020 | * | $ | 283,444,533 | ​ | $ | 303,993,142 | ​
At December 31, 2019 | * | $ | 281,771,246 | ​ | $ | 290,892,652 | ​
Investment Properties | ​ | ​ | ​ | ​ | ​ | ​ | ​
At December 31, 2020 | * | $ | 166,308,029 | ​ | $ | 179,647,759 | ​
At December 31, 2019 | * | $ | 166,404,255 | ​ | $ | 169,988,236 | ​

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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