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RENTAL INCOME (Concentration) (Details) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Concentration Risk |  |
Aggregate contingent rentals | $ 328,000 | $ 437,000
Commercial rental income | Major tenant | Staples and Trader Joes | WRF Associates LLC Strip Mall Framingham, Massachusetts |  |
Concentration Risk |  |
Concentration risk percentage | 23.00% |

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