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Real Estate Assets (Summary of Properties Owned) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 238,453
Garden Gateway Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Mar. 01, 2007
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 11,369
World Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2007
Location	San Bernardino, California
Real Estate Assets Owned	$ 5,781
Executive Office Park [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jul. 01, 2008
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 8,088
Waterman Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2008
Location	San Bernardino, California
Real Estate Assets Owned	$ 5,559
Pacific Oaks Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Sep. 01, 2008
Location	Escondido, California
Real Estate Assets Owned	$ 3,990
Morena Office Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Jan. 01, 2009
Location	San Diego, California
Real Estate Assets Owned	$ 4,775
Genesis Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2010
Location	San Diego, California
Real Estate Assets Owned	$ 8,497
Dakota Bank Buildings [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	May 01, 2011
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 9,379
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	$ 13,749
The Presidio [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Nov. 01, 2012
Location	Aurora, Colorado
Real Estate Assets Owned	$ 6,405
Bismarck Office Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Mar. 01, 2014
Location	Fargo, ND
Real Estate Assets Owned	$ 5,897
Union Terrace Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2014
Location	Lakewood, Colorado
Real Estate Assets Owned	$ 8,217
Centennial Tech Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2014
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 13,162
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	$ 10,423	[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	$ 10,058
One Park Centre [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Westminster, Colorado
Real Estate Assets Owned	$ 8,588
West Fargo Industrial [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 7,346
300 N.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Fargo, North Dakota
Real Estate Assets Owned	$ 3,603
Research Parkway [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Colorado Springs, Colorado
Real Estate Assets Owned	$ 2,636
Presidio Property Trust, Inc Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 189,315
Highland Court [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Aug. 01, 2015
Location	Centennial, Colorado
Real Estate Assets Owned	$ 12,084
Shea Center II [Member]
Real Estate And Accumulated Depreciation [Line Items]
Date acquired	Dec. 01, 2015
Location	Highlands Ranch, Colorado
Real Estate Assets Owned	$ 23,097
Model Home Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate Assets Owned	$ 49,138
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 June 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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