ORGANIZATION (Details) ft² in Millions	Oct. 31, 2017 ft² property item
Real Estate Properties [Line Items]
Net rentable area (in square feet) | ft²	2.5
Multi-family Residential Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	89
Number of apartment units | item	13,576
Commercial Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	40
Commercial Properties [Member] | Medical Property [Member]
Real Estate Properties [Line Items]
Number of real estate properties	28
Commercial Properties [Member] | Other Property [Member]
Real Estate Properties [Line Items]
Number of real estate properties	12