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Commitments and Contingencies (Details)			3 Months Ended			9 Months Ended
	Aug. 25, 2017 USD ($)	Apr. 12, 2017 USD ($)	Sep. 30, 2017 USD ($) lease	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) lease	Sep. 30, 2016 USD ($)	Aug. 18, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Number of properties subject to ground leases | lease			1			1
Ground lease expense			$ 93,000		$ 67,000	$ 160,000	$ 242,000
Office space, rent expense			527,000		$ 359,000	1,198,000	$ 1,052,000
Accrued contingent consideration through acquisition of investment property			9,714,000			9,714,000				$ 0
Compensatory Damages
Loss Contingencies [Line Items]
Damages awarded in jury verdict		$ 6,000,000
Punitive Damages
Loss Contingencies [Line Items]
Damages awarded in jury verdict		6,000,000
Legacy Corner Apartments Litigation
Loss Contingencies [Line Items]
Loss contingency accrual									$ 3,000,000	$ 0
Loss contingency accrual, period decrease			2,447,000
Final settlement paid			553,000
Potential loss contingency exposure		$ 6,000,000
Litigation settlement paid by insurance carrier				$ 1,000,000
The Parke
Loss Contingencies [Line Items]
Accrued contingent consideration through acquisition of investment property			$ 9,714,000			$ 9,714,000		$ 17,129,000
Cash transferred	$ 7,415,000

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