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Real Estate Assets (Summary of Properties Owned) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
Real Estate And Accumulated Depreciation [Line Items]  
Real Estate Assets Owned $ 205,726
Garden Gateway Plaza [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Mar. 01, 2007
Location Colorado Springs, Colorado
Real Estate Assets Owned $ 11,312
World Plaza [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Sep. 01, 2007 [1]
Location San Bernardino, California [1]
Real Estate Assets Owned $ 8,329 [1]
Executive Office Park [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Jul. 01, 2008
Location Colorado Springs, Colorado
Real Estate Assets Owned $ 7,858
Waterman Plaza [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2008
Location San Bernardino, California
Real Estate Assets Owned $ 4,933
Genesis Plaza [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2010
Location San Diego, California
Real Estate Assets Owned $ 8,946
Dakota Center [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired May 01, 2011
Location Fargo, North Dakota
Real Estate Assets Owned $ 8,951
The Presidio [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Nov. 01, 2012 [1],[2]
Location Colorado Springs, Colorado [1],[2]
Real Estate Assets Owned $ 6,498 [1],[2]
Grand Pacific Center [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Mar. 01, 2014
Location Bismarck, North Dakota
Real Estate Assets Owned $ 5,903
Union Terrace [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2014 [1]
Location Lakewood, Colorado [1]
Real Estate Assets Owned $ 8,174 [1]
Centennial Tech Center [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Dec. 01, 2014 [1]
Location Colorado Springs, Colorado [1]
Real Estate Assets Owned $ 12,826 [1]
Arapahoe Center [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Dec. 01, 2014
Location Centennial, Colorado
Real Estate Assets Owned $ 10,006
Union Town Center [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Dec. 01, 2014
Location Colorado Springs, Colorado
Real Estate Assets Owned $ 9,764
West Fargo Industrial [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2015
Location West Fargo, North Dakota
Real Estate Assets Owned $ 7,279
300 N.P. [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2015
Location Fargo, North Dakota
Real Estate Assets Owned $ 3,474
Research Parkway [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2015
Location Colorado Springs, Colorado
Real Estate Assets Owned $ 2,546
One Park Centre [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2015
Location Westminster, Colorado
Real Estate Assets Owned $ 8,532
Highland Court [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Aug. 01, 2015
Location Centennial, Colorado
Real Estate Assets Owned $ 11,554
Shea Center II [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Date acquired Dec. 01, 2015
Location Highlands Ranch, Colorado
Real Estate Assets Owned $ 22,305
Presidio Property Trust, Inc Properties [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Real Estate Assets Owned 159,190
Model Home Properties [Member]  
Real Estate And Accumulated Depreciation [Line Items]  
Real Estate Assets Owned $ 46,536
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, 2019
[1] Properties held for sale as of June 30, 2019.
[2] The Presidio was sold on July 31, 2019.