REAL ESTATE SOLD AND HELD FOR SALE DISCONTINUED OPERATIONS (Details)	3 Months Ended
	Sep. 30, 2016 USD ($) a	Jun. 30, 2016 USD ($) ft²	Mar. 31, 2016 USD ($) ft²	Jun. 30, 2015 USD ($) ft² properties	Mar. 31, 2015 USD ($)
Northwest Point Distribution and Service Centers and North Stemmons III [Member]
Long Lived Assets Held-for-sale [Line Items]
Square Footage of Real Estate Property | ft²			292,000
Gain (Loss) on Sale of Properties			$ 11,332,000
Proceeds from Sale of Property, Plant, and Equipment			18,850,000
Sale of America Plaza, Lockwood, West Loop 1 & 2, North Stemmons II, Interstate Commons 1 & 2 and Castilian Research Center [Member]
Long Lived Assets Held-for-sale [Line Items]
Square Footage of Real Estate Property | ft²		872,000
Gain (Loss) on Sale of Properties		$ 30,981,000
Proceeds from Sale of Property, Plant, and Equipment		55,210,000
Ambassador Row Warehouse (one building sold in 2015) [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of real estate properties transferred to held for sale and sold | properties				1
Square Footage of Real Estate Property | ft²				185,000
Gain (Loss) on Sale of Properties				$ 2,903,000
Proceeds from Sale of Property, Plant, and Equipment				$ 5,250,000
Land [Member]
Long Lived Assets Held-for-sale [Line Items]
Proceeds from Sale of Property, Plant, and Equipment	$ 4,083,000	644,000	673,000		$ 170,000
Gain on sales of land	$ 590,000	$ 133,000	$ 10,000		$ 123,000
Area of Land | a	20