REAL ESTATE PROPERTIES 4 (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
State or Province [Line Items]
Leases terms minimum (in years)	40 years
Leases terms maximum (in years)	50 years
Renewal period option minimum (in years)	15 years
Renewal period option maximum (in years)	35 years
Total ground lease expenditures for continuing and discontinued operations	$ 756,000	$ 756,000	$ 745,000
Payment increase interval minimum (in years)	3 years
Payment increase interval maximum (in years)	10 years
Future Total Minimum Ground Lease Payments [Abstract]
2017	$ 756,000
2018	756,000
2019	756,000
2020	756,000
2021	756,000
Thereafter	10,430,000
Total minimum payments	$ 14,210,000
ARIZONA
State or Province [Line Items]
Number of properties subject to ground leases	1
TEXAS
State or Province [Line Items]
Number of properties subject to ground leases	2
FLORIDA
State or Province [Line Items]
Number of properties subject to ground leases	2