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PRO FORMA FINANCIAL INFORMATION (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Business Acquisition [Line Items]
Business combination and acquisition cost expensed		$ 2.1
Office Property, Portfolio [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired	9	9
Austin Suburban Portfolio [Member] \| Office Portfolio [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired	1	1
Austin Suburban Portfolio [Member] \| Office Property, Portfolio [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired	3	3
Westmoor Center [Member] \| Office Property [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired	1	1
Austin Suburban Portfolio and Westmoor Center [Member]
Business Acquisition [Line Items]
Business combination and acquisition cost expensed	$ 1.1	$ 2.1

For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed.

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