SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2014 joint_ventures
Controlling interest Joint ventures [Abstract]
Joint Ventures	2
University Business Centers [Member]
Controlling interest Joint ventures [Abstract]
Controlling interest in joint ventures (in hundredths)	80.00%
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests (in hundredths)	100.00%
Castilian Research Center [Member]
Controlling interest Joint ventures [Abstract]
Controlling interest in joint ventures (in hundredths)	80.00%
Joint ventures' assets, liabilities, revenues and expenses with noncontrolling interests (in hundredths)	100.00%
Industry Distribution Center II - undivided tenant [Member]
Tenant-in-common interest [Abstract]
Equity method of accounting is used for undivided tenant-in-common interest in Industry Distribution Center II (in hundredths)	50.00%