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ACQUISITIONS, DEVELOPMENTS PLACED IN SERVICE AND DISPOSITIONS, DEVELOPMENT PROJECTS PLACED IN SERVICE (Details) (Development Projects Placed in Service [Member], USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 Multi-Family Residential [Member] Dakota Commons, Williston, North Dakota [Member] Unit | Apr. 30, 2015 Multi-Family Residential [Member] Dakota Commons, Williston, North Dakota [Member] | Apr. 30, 2014 Multi-Family Residential [Member] Dakota Commons, Williston, North Dakota [Member] | Oct. 31, 2014 Multi-Family Residential [Member] Landing at Southgate - Minot, ND [Member] | Oct. 31, 2013 Multi-Family Residential [Member] Landing at Southgate - Minot, ND [Member] Unit
Significant Development Projects Placed in Service [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date placed in service |  |  |  |  | Jul. 15, 2014 | [1],[2] |  |  |  |  | Sep. 04, 2013 | [3],[4] |  |
Land | $ 823 | [1] | $ 2,262 | [3] | $ 823 | [1],[2] |  |  |  |  |  |  | $ 2,262 | [3],[4]
Building | 9,452 | [1] | 12,864 | [3] | 9,452 | [1],[2] |  |  |  |  |  |  | 12,864 | [3],[4]
Development costs of projects placed in service | $ 10,275 | [1] | $ 15,126 | [3] | $ 10,275 | [1],[2] | $ 2,200 | [1],[2] | $ 8,100 | [1],[2] |  |  | $ 15,126 | [3],[4]
Number of units |  |  |  |  | 44 | [1],[2] |  |  |  |  |  |  | 108 | [3],[4]
[1] | Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 6 for additional information on the Renaissance Heights I project, which was partially placed in service during the fiscal year 2014 and the three months ended July 31, 2014.
[2] | Development property placed in service July 15, 2014. Costs paid in fiscal year 2014 totaled $8.1 million, including the land acquired in fiscal year 2013. Additional costs paid in fiscal year 2015 totaled $2.2 million, for a total project cost at July 31, 2014 of $10.3 million.
[3] | Development projects that are placed in service in phases are excluded from this table until the entire project has been placed in service. See Note 6 for additional information on the River Ridge and Cypress Court projects, which were partially placed in service during the three months ended October 31, 2013.
[4] | Development property placed in service September 4, 2013. Costs paid in fiscal year 2013 totaled $6.3 million. Costs paid in fiscal year 2014 totaled $8.8 million for a total project cost at October 31, 2013 of $15.1 million. The project is owned by a joint venture entity in which the Company has an approximately 52.9% interest.

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