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Real Estate Assets (Summary of Properties Owned) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 239,304
Garden Gateway Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Mar. 01, 2007
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 11,450
World Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2007
Location	San Bernardino, California
Real Estate Assets Owned	$ 5,738
Executive Office Park [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jul. 01, 2008
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 8,120
Waterman Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2008
Location	San Bernardino, California
Real Estate Assets Owned	$ 5,656
Pacific Oaks Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2008
Location	Escondido, California
Real Estate Assets Owned	$ 4,019
Morena Office Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jan. 01, 2009
Location	San Diego, California
Real Estate Assets Owned	$ 4,922
Genesis Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2010
Location	San Diego, California
Real Estate Assets Owned	$ 8,707
Dakota Bank Buildings [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	May 01, 2011
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 9,772
Yucca Valley Retail Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2011
Location	Yucca Valley, California
Real Estate Assets Owned	$ 6,605
Port of San Diego Complex [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2011
Location	San Diego, California
Real Estate Assets Owned	$ 13,957
The Presidio [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Nov. 01, 2012
Location	Aurora, Colorado
Real Estate Assets Owned	$ 6,432
Bismarck Office Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Mar. 01, 2014
Location	Fargo, ND
Real Estate Assets Owned	$ 5,788
Union Terrace [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2014
Location	Lakewood, Colorado
Real Estate Assets Owned	$ 8,395
Centennial Tech Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2014
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 13,585
Arapahoe Service Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2014
Location	Centennial, Colorado
Real Estate Assets Owned	$ 10,783
Union Town Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2014
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 10,293
One Park Centre [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Westminster, Colorado
Real Estate Assets Owned	$ 8,505
West Fargo Industrial [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 7,500
300 N.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 3,672
Research Parkway [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 2,710
Presidio Property Trust, Inc Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 192,800
Highland Court [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Centennial, Colorado
Real Estate Assets Owned	$ 12,449
Shea Center II [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2015
Location	Highlands Ranch, Colorado
Real Estate Assets Owned	$ 23,742
Model Home Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 46,504
Model Home Properties [Member] | Minimum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jan. 01, 2010
Model Home Properties [Member] | Maximum [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jan. 01, 2017

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule III)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
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