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COMMITMENTS AND CONTINGENCIES (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2017 USD ($) ft² item property | Jul. 31, 2016 USD ($) | Jul. 01, 2017 USD ($) | Apr. 30, 2017 USD ($)
Real Estate Properties [Line Items] |  |  |  |
Property owned | $ 1,744,252,000 |  |  | $ 1,677,481,000
Total gross rental revenue from properties subject to purchase options | $ 47,647,000 | $ 44,985,000 |  |
Redemption basis | one-for-one |  |  |
Number of consecutive trading days for valuation | 10 days |  |  |
Aggregate redemption value of Units of operating partnership owned by limited partners | $ 91,500,000 |  |  | $ 95,100,000
Tenant improvements | $ 4,700,000 |  |  |
Commitment period for tenant improvements | 12 months |  |  |
Loan commitment | $ 13,200,000 |  | $ 16,200,000 |
Southgate - Minot, ND [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of joint ventures with purchase commitment | item | 1 |  |  |
Commitment period to acquire joint venture interest | 4 years |  |  |
Subject to Purchase Options [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of properties | property | 2 |  |  |
Subject to Purchase Options [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property owned | $ 24,500,000 |  |  |
Total gross rental revenue from properties subject to purchase options | 621,000 |  |  |
Subject to Purchase Options [Member] | St Michael Clinic - St Michael, MN [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property owned | 2,900,000 |  |  |
Total gross rental revenue from properties subject to purchase options | $ 65,000 |  |  |
Subject to Restrictions on Taxable Dispositions [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of properties | property | 31 |  |  |
Area of real estate property | ft² | 596,000 |  |  |
Number of apartment units | item | 3,476 |  |  |
Real estate investment amount of properties (net of accumulated depreciation) | $ 342,900,000 |  |  |

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