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SCHEDULE OF REAL ESTATE PROPERTIES (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Real estate assets owned $ 125,888 $ 166,254 $ 200,207
Garden Gateway Plaza [Member]      
Geographic location Colorado Springs, Colorado [1] Colorado Springs, Colorado [2]  
Real estate assets owned [1] $ 11,465 [1],[2] 11,428 [2]
World Plaza [Member]      
Geographic location San Bernardino, California [3] San Bernardino, California [2]  
Real estate assets owned $ 9,272 [3] $ 9,272 [2],[3] 8,305 [2]
Executive Office Park [Member]      
Geographic location Colorado Springs, Colorado [1] Colorado Springs, Colorado  
Real estate assets owned [1] $ 5,106 [1] 7,723
Waterman Plaza [Member]      
Geographic location San Bernardino, California [1] San Bernardino, California [2]  
Real estate assets owned [1] $ 3,500 [1],[2] 4,889 [2]
Genesis Plaza [Member]      
Geographic location San Diego, California San Diego, California  
Real estate assets owned $ 8,412 [4] $ 8,651 [4] 8,789
Dakota Center [Member]      
Geographic location Fargo, North Dakota Fargo, North Dakota  
Real estate assets owned $ 8,694 $ 8,597 8,855
Grand Pacific Center [Member]      
Geographic location Bismarck, North Dakota Bismarck, North Dakota  
Real estate assets owned $ 5,525 $ 5,684 5,914
Arapahoe Center [Member]      
Geographic location Centennial, Colorado Centennial, Colorado  
Real estate assets owned $ 8,901 $ 9,233 9,748
Union Town Center [Member]      
Geographic location Colorado Springs, Colorado Colorado Springs, Colorado  
Real estate assets owned $ 9,212 $ 9,345 9,612
West Fargo Industrial [Member]      
Geographic location Fargo, North Dakota Fargo, North Dakota  
Real estate assets owned $ 6,996 $ 7,061 7,212
The 300 N.P [Member]      
Geographic location Fargo, North Dakota Fargo, North Dakota  
Real estate assets owned $ 3,218 $ 3,280 3,405
Research Parkway [Member]      
Geographic location Colorado Springs, Colorado Colorado Springs, Colorado  
Real estate assets owned $ 2,392 $ 2,438 2,512
One Park Centre [Member]      
Geographic location Westminster, Colorado Westminster, Colorado  
Real estate assets owned $ 8,072 $ 8,586 8,518
Highland Court [Member]      
Geographic location Centennial, Colorado [1],[5] Centennial, Colorado [2]  
Real estate assets owned [1],[5] $ 10,500 [1],[2],[5] 11,421 [2]
Shea Center II [Member]      
Geographic location Highlands Ranch, Colorado Highlands Ranch, Colorado  
Real estate assets owned $ 20,340 $ 21,026 21,853
Mandolin [Member]      
Geographic location [5] Houston, Texas    
Real estate assets owned [5] $ 4,899  
Presidio Property Trust, Inc. Properties [Member]      
Real estate assets owned $ 95,933 $ 123,744 151,741
Model Home Properties [Member]      
Geographic location TX, FL, IL, WI [6] AZ, FL, IL, PA, TX, WI [7]  
Real estate assets owned $ 29,955 [6] $ 42,510 [6],[7] 48,466 [7]
Union Terrace [Member]      
Geographic location [8]   Lakewood, CO  
Real estate assets owned [8]   8,425
Centennial Tech Center [Member]      
Geographic location [8]   Colorado Springs, Colorado  
Real estate assets owned [8]   $ 13,132
[1] This property was sold during the nine months ended September 30, 2021.
[2] Property held for sale as of December 31, 2020.
[3] This property is held for sale as of September 30, 2021.
[4] Genesis Plaza is owned by two tenants-in-common, each of which owns 57% and 43%, respectively, and we beneficially own an aggregate of 76.4%.
[5] A portion of the proceeds from the sale of Highland Court were used in like-kind exchange transactions pursued under Section 1031 of the Internal Revenue for the acquisition of our Mandolin property. Mandolin is owned by NetREIT Palm Self-Storage LP, through its wholly owned subsidiary NetREIT Highland LLC, and the Company is the sole general partner and owns 61.3% of NetREIT Palm Self-Storage LP.
[6] Includes three Model Homes listed as held for sale as of September 30, 2021.
[7] Includes seven Model Homes that are listed as held for sale as of December 31, 2020.
[8] This property was sold during the year ended December 31, 2020.