ORGANIZATION (Details) ft² in Millions	Jul. 31, 2016 ft² item property
Real Estate Properties [Line Items]
Percentage of ordinary taxable income that must be distributed to shareholders (in hundredths)	90.00%
Medical Property [Member]
Real Estate Properties [Line Items]
Number of real estate properties	31
Net rentable area (in square feet) | ft²	2.8
Medical Property [Member] | Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	35
Other Property [Member]
Real Estate Properties [Line Items]
Number of real estate properties	16
Multi-family Residential Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	100
Number of apartment units owned | item	13,012
Multi-family Residential Properties [Member] | Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1
Unimproved Land [Member] | Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	2