SUBSEQUENT EVENTS (Details) - Subsequent Event [Member] $ in Millions	1 Months Ended
	Jul. 25, 2019 USD ($) ft² a Integer
385 Business Park [Member]
Subsequent Event [Line Items]
Building Occupation Percentage	35.00%
Building occupation percentage upon completion of in-progress tenant improvements	100.00%
Size (in square feet) of buildings acquired | ft²	155,000
Building Lease Percentage	100.00%
Real estate property acquistion, purchase price	$ 14.0
Miramar Land [Member]
Subsequent Event [Line Items]
Size (in acres) of land acquired | a	6.5
Real estate property acquistion, purchase price	$ 13.4
Ownership percentage by joint venture partner	5.00%
Ownership percentage	95.00%
Size (in square feet) of buildings to be developed | ft²	125,000
Interstate Commons Distribution Center I and II [Member]
Subsequent Event [Line Items]
Size (in square feet) of buildings acquired | ft²	142,000
Number of buildings	2
Real estate property acquistion, purchase price	$ 9.2
Estimated Total Cumulative Development Costs	$ 12.0
University Business Center 130
Subsequent Event [Line Items]
Size (in square feet) of building | ft²	40,000
Net Sales Price of Real Estate Sold	$ 11.5
Less Than Wholly Owned Joint Venture Investment Ownership Percentage	80.00%
Senior unsecured private placement notes executed in 2Q19 [Member]
Subsequent Event [Line Items]
Total amount of unsecured debt	$ 110.0
Number of insurance companies | Integer	2
$75 million senior unsecured private placement notes (2019) [Member]
Subsequent Event [Line Items]
Unsecured debt, notional amount	$ 75.0
Debt, term (in years) | Integer	10
Debt Instrument, Interest Rate, Stated Percentage	3.47%
$35 million senior unsecured private placement notes (2019) [Member]
Subsequent Event [Line Items]
Unsecured debt, notional amount	$ 35.0
Debt, term (in years) | Integer	12
Debt Instrument, Interest Rate, Stated Percentage	3.54%