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Real Estate Acquired and Sold - Narrative (Details)	1 Months Ended			9 Months Ended
	Aug. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Feb. 28, 2015 USD ($) a	Sep. 30, 2016 USD ($) ft² property
Business Acquisition [Line Items]
Aggregate cost				$ 10,300,000
Property acquisition costs				$ 57,000
Area of real estate property (in acres) | ft²				197,127
Number of properties purchased | property				2
Portion of purchase price allocated to land				$ 9,400,000
Portion of purchase price allocated to buildings				900,000
Portion of purchase price allocated to leases acquired in place				100,000
Portion of purchase price allocated to below market lease				$ (100,000)
726 N. Glebe Road
Business Acquisition [Line Items]
Aggregate cost		$ 4,000,000
Property acquisition costs		$ 56,700
700 N. Glebe Road
Business Acquisition [Line Items]
Aggregate cost	$ 7,200,000
Westview Pad
Business Acquisition [Line Items]
Aggregate cost			$ 900,000
Area of real estate property (in acres) | a			1.1
Thruway Pad
Business Acquisition [Line Items]
Aggregate cost	3,100,000
Property acquisition costs	$ 57,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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