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Real Estate Assets (Summary of Properties Owned) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 237,367
Garden Gateway Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Mar. 01, 2007
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 11,268
World Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2007
Location	San Bernardino, California
Real Estate Assets Owned	$ 5,761
Executive Office Park [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jul. 01, 2008
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 8,027
Waterman Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2008
Location	San Bernardino, California
Real Estate Assets Owned	$ 5,000
Pacific Oaks Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2008
Location	Escondido, California
Real Estate Assets Owned	$ 3,965
Morena Office Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jan. 01, 2009
Location	San Diego, California
Real Estate Assets Owned	$ 4,723
Genesis Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2010
Location	San Diego, California
Real Estate Assets Owned	$ 8,506
Dakota Bank Buildings [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	May 01, 2011
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 9,258
Yucca Valley Retail Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2011	[1]
Location	Yucca Valley, California	[1]
Real Estate Assets Owned	$ 6,612	[1]
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	$ 13,687
The Presidio [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Nov. 01, 2012
Location	Aurora, Colorado
Real Estate Assets Owned	$ 6,427
Grand Pacific Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Mar. 01, 2014
Location	Bismarck, North Dakota
Real Estate Assets Owned	$ 5,846
Union Terrace Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2014
Location	Lakewood, Colorado
Real Estate Assets Owned	$ 8,095
Centennial Tech Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2014
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 13,027
Arapahoe Service Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2014	[1]
Location	Centennial, Colorado	[1]
Real Estate Assets Owned	$ 10,380	[1]
Union Town Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2014
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 9,981
One Park Centre [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Westminster, Colorado
Real Estate Assets Owned	$ 8,538
West Fargo Industrial [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 7,304
300 N.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 3,569
Research Parkway [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 2,612
Presidio Property Trust, Inc Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 187,292
Highland Court [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Centennial, Colorado
Real Estate Assets Owned	$ 11,910
Shea Center II [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2015
Location	Highlands Ranch, Colorado
Real Estate Assets Owned	$ 22,796
Model Home Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 50,075
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, 2018
[1] Properties held for sale as of September 30, 2018.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column H
-Subsection 28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28(Column H))
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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