PRO FORMA FINANCIAL INFORMATION (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Business Acquisition [Line Items]
Business combination and acquisition cost expensed	$ 4.0
Office Portfolio [Member]
Business Acquisition [Line Items]
Number of real estate properties	1
Office Campus [Member]
Business Acquisition [Line Items]
Number of real estate properties	1
Office Buildings, Campus [Member]
Business Acquisition [Line Items]
Number of real estate properties	9
Apartment Property [Member]
Business Acquisition [Line Items]
Number of real estate properties	1
Austin Suburban Portfolio [Member] | Office Portfolio [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired	1
Austin Suburban Portfolio [Member] | Office Property [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired	3
Westmoor Center [Member] | Office Property [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired	4
Bellevue Technology Center, Powers Ferry Landing East, 1800 West Loop and West Loop I & II [Member]
Business Acquisition [Line Items]
Business combination and acquisition cost expensed	$ 2.8