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v3.8.0.1

SUBSEQUENT EVENTS (Details) - Subsequent Event [Member] $ in Millions | Dec. 01, 2017 USD ($) property item | Nov. 30, 2017 USD ($) property | Nov. 28, 2017 USD ($) item | Nov. 22, 2017 USD ($)
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Line of Credit [Member] | BMO Line of Credit [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loan amount |  |  | $ 70.0 |
Line of Credit [Member] | BMO Line of Credit [Member] | Minimum [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of hedge instruments | item |  |  | 1 |
Discontinued Operations, Held-for-sale [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Sales price of pending disposition |  | $ 417.5 |  |
Multi-Family Residential [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of apartment units | item |  |  | 274 |
Total acquisition costs |  |  | $ 90.6 |
Multi-Family Residential [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of properties | property | 2 |  |  |
Number of apartment units | item | 64 |  |  |
Sale price | $ 6.7 |  |  |
Industrial [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Sale price |  |  | $ 18.7 | $ 16.7
Healthcare [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of properties | property |  | 28 |  |
Office Property [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of properties | property |  | 1 |  |

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