BUSINESS COMBINATIONS AND ACQUIRED INTANGIBLES (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft² Integer	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Amortization expense for lease intangibles	$ 1,056,000	$ 944,000	$ 3,202,000	$ 3,129,000
Above and below market leases Increase (decrease) rental Income	121,000	94,000	370,000	326,000
Acquisition-related costs expensed	$ 161,000	$ 0	$ 161,000	$ 0
Parc North [Member]
Business Acquisition [Line Items]
Number of buildings | Integer			4
Total cost of properties purchased			$ 32,000,000
Size (in square feet) of buildings acquired | ft²			446,000
Property percent leased	42.00%		42.00%
Flagler Center [Member]
Business Acquisition [Line Items]
Number of buildings | Integer			3
Total cost of properties purchased			$ 24,000,000
Size (in square feet) of buildings acquired | ft²			358,000
Flagler Center and Parc North [Member]
Business Acquisition [Line Items]
Total cost of properties purchased			$ 55,939,000
Amount of total cost allocated to land	$ 11,932,000		11,932,000
Flagler Center and Parc North [Member] | Leases, Acquired-in-Place [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate	3,187,000		3,187,000
Flagler Center and Parc North [Member] | Above Market Leases [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate	342,000		342,000
Flagler Center and Parc North [Member] | Below market lease [Member]
Business Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate	802,000		802,000
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 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
Real Estate Properties [Domain] | Flagler Center and Parc North [Member]
Business Acquisition [Line Items]
Amount of total cost allocated to real estate properties	22,228,000		22,228,000
Real Estate Properties [Domain] | Southpark Corporate Center and Springdale Business Center [Domain]
Business Acquisition [Line Items]
Amount of total cost allocated to real estate properties					$ 28,648,000
Industrial Development [Member] | Flagler Center and Parc North [Member]
Business Acquisition [Line Items]
Amount of total cost allocated to real estate properties	$ 30,984,000		$ 30,984,000