ORGANIZATION (Details) - Jul. 31, 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	12,027
Commercial Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	81
Net rentable area (in square feet) | ft²	4.4
Commercial Properties [Member] | Held for Sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	67