ORGANIZATION (Details) - Apr. 30, 2015 ft² in Millions	ft² Property Unit
ORGANIZATION [Abstract]
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths)	90.00%
Multi-family Residential Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	100
Number of apartment units owned | Unit	11,844
Commercial Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	149
Net rentable area (in square feet) | ft²	9.6