ORGANIZATION (Details) ft² in Millions	Jul. 31, 2017 ft² item property
Medical Property [Member]
Real Estate Properties [Line Items]
Number of real estate properties	29
Medical Property [Member] | Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	2
Retail [Member] | Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1
Other Property [Member]
Real Estate Properties [Line Items]
Number of real estate properties	13
Multi-family Residential Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	88
Number of apartment units | item	13,076
Net rentable area (in square feet) | ft²	2.6
Multi-family Residential Properties [Member] | Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	13
Unimproved Land [Member] | Discontinued Operations, Held-for-sale [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1