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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Notes Receivable from Mobile Home Parks | Independent third party and affiliates | Customer concentration risk
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Concentration risk percentage	52.90%	38.30%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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