BUSINESS COMBINATIONS AND ACQUIRED INTANGIBLES (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Amortization expense for lease intangibles	$ 1,111,000	$ 1,144,000
Above and below market leases Increase (decrease) rental Income	125,000	122,000
Acquisition-related costs expensed	$ 0	$ 0
Southpark Corporate Center and Springdale Business Center [Domain]
Business Acquisition [Line Items]
Total cost of properties purchased			$ 31,574,000
Amount of total cost allocated to real estate properties			28,648,000
Amount of total cost allocated to land			5,494,000
Southpark Corporate Center and Springdale Business Center [Domain] | Leases, Acquired-in-Place [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate			3,453,000
Southpark Corporate Center and Springdale Business Center [Domain] | Below market lease [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate			$ 527,000