SUBSEQUENT EVENTS (Details)	Mar. 09, 2018 USD ($) item	Dec. 31, 2015 item
Subsequent events
Number of units | item		1,033
Subsequent event | Webster Green Apartments
Subsequent events
Number of units | item	79
Purchase price of real estate properties	$ 34,500,000
Amount paid into escrow	500,000
Mortgage assumed.	$ 21,500,000