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NOTES RECEIVABLE FROM MOBILE HOME PARKS (MHP Notes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Notes Receivable from Mobile Home Parks |  |  |  |  |
Notes Receivable |  |  |  |  |
Charge offs | $ 0 | $ 0 | $ 0 | $ 0 |
Allowance for loan losses | $ 0 |  | $ 0 |  | $ 0
Accounts receivable | Credit concentration risk | Independent third party and affiliates |  |  |  |  |
Notes Receivable |  |  |  |  |
Concentration risk percentage |  |  | 51.10% |  | 38.30%

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