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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Mortgage Receivable and Notes Receivable (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Aug. 31, 2017 USD ($) property | Mar. 31, 2019 USD ($) community | Mar. 31, 2018 USD ($) | Jul. 31, 2017 USD ($)
Real Estate Properties [Line Items] |  |  |  |
Impairment of real estate investments |  | $ 0 | $ 0 |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Mortgage loans receivable | $ 11,000,000 | $ 10,300,000 |  |
Loans receivable, communities remaining in the pool of assets used to secure the mortgage | community |  | 12 |  |
Interest income |  | $ 407,000 | 673,000 |
Multi-Family Residential |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Interest rate |  | 6.00% |  |
Loan commitment |  |  |  | $ 16,200,000
Discontinued Operations, Disposed of by Sale | Multi-Family Residential |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |
Number of real estate properties sold | property | 13 |  |  |
Interest rate |  | 5.50% |  |
Interest income |  | $ 143,000 | $ 151,000 |

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- Definition Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column B)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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