REAL ESTATE PROPERTY ACQUISITIONS AND ACQUIRED INTANGIBLES (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Integer
Property Acquisition [Line Items]
Amortization expense for lease intangibles	$ 1,233,000	$ 1,035,000	$ 2,354,000	$ 2,146,000
Above and below market leases Increase (decrease) rental Income	141,000	124,000	277,000	$ 249,000
Acquisition-related costs expensed
2017 Acquisitions (Shiloh 400, Broadmoor, Southpark 5-7) [Member] [Member]
Property Acquisition [Line Items]
Total cost of properties purchased			36,475,000
Amount of total cost allocated to land	5,700,000		5,700,000
2017 Acquisitions (Shiloh 400, Broadmoor, Southpark 5-7) [Member] [Member] | Leases, Acquired-in-Place [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate	3,016,000		3,016,000
2017 Acquisitions (Shiloh 400, Broadmoor, Southpark 5-7) [Member] [Member] | Above Market Leases [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate	114,000		114,000
2017 Acquisitions (Shiloh 400, Broadmoor, Southpark 5-7) [Member] [Member] | Below market lease [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate	320,000		320,000
Flagler Center [Member]
Property Acquisition [Line Items]
Number of buildings | Integer					3
2016 Acquisitions (Parc North, Flagler, Weston and Jones) [Member]
Property Acquisition [Line Items]
Total cost of properties purchased					$ 112,158,000
Property acquisition, value allocated to Development					84,490,000
Amount of total cost allocated to land					29,164,000
2016 Acquisitions (Parc North, Flagler, Weston and Jones) [Member] | Leases, Acquired-in-Place [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate					5,941,000
2016 Acquisitions (Parc North, Flagler, Weston and Jones) [Member] | Above Market Leases [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate					393,000
2016 Acquisitions (Parc North, Flagler, Weston and Jones) [Member] | Below market lease [Member]
Property Acquisition [Line Items]
Intangible acquired associated with purchase of Real Estate					894,000
Real Estate Properties [Domain] | 2017 Acquisitions (Shiloh 400, Broadmoor, Southpark 5-7) [Member] [Member]
Property Acquisition [Line Items]
Amount of total cost allocated to real estate properties	$ 33,665,000		$ 33,665,000
Real Estate Properties [Domain] | 2016 Acquisitions (Parc North, Flagler, Weston and Jones) [Member]
Property Acquisition [Line Items]
Amount of total cost allocated to real estate properties					$ 22,228,000