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Subsequent Events (Details) - Office Building - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2015	Jul. 31, 2015	Jul. 17, 2015	Jul. 09, 2015
Comerica Bank Building \| Subsequent Event
Subsequent Event [Line Items]
Gross sale price				$ 31.4
245 Riverside \| Subsequent Event
Subsequent Event [Line Items]
Gross sale price			$ 25.1
Scenario, Forecast \| 550 Greens Parkway \| Subsequent Event
Subsequent Event [Line Items]
Gross sale price		$ 2.3
Scenario, Forecast \| Two Buckhead Plaza
Subsequent Event [Line Items]
Acquisition purchase price	$ 80.0
Interest rate on debt assumed in acquisitions	6.425%
First Mortgage \| Scenario, Forecast \| Two Buckhead Plaza
Subsequent Event [Line Items]
Liabilities assumed in acquisitions	$ 52.0