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MORTGAGE NOTES PAYABLE (Details)	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 property	Jun. 30, 2020	Jun. 30, 2020 building	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Mortgage notes payable	$ 126,442,100				$ 143,459,048
Unamortized loan costs	(911,172)				(1,066,056)
Mortgage notes payable, total net	125,530,928				142,392,992
Number of real estate properties held for sale | property		3
Subtotal, Presidio Property Trust, Inc. Properties
Debt Instrument [Line Items]
Mortgage notes payable	95,172,071				110,814,919
Garden Gateway Plaza
Debt Instrument [Line Items]
Mortgage notes payable	5,967,727				6,071,315
Interest rate			5.00%
World Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 5,854,222				4,979,383
Weighted average interest rate			4.40%
World Plaza | ABR
Debt Instrument [Line Items]
Variable interest rate on mortgage	0.75%
World Plaza | LIBOR
Debt Instrument [Line Items]
Variable interest rate on mortgage	2.75%
West Fargo Industrial
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,177,324				4,216,565
Interest rate			4.79%
Waterman Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 3,247,878				3,274,097
Weighted average interest rate			4.25%
Floor rate			4.25%
Waterman Plaza | LIBOR
Debt Instrument [Line Items]
Variable interest rate on mortgage	3.00%
300 N.P.
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,292,848				2,311,738
Interest rate			4.95%
Highland Court
Debt Instrument [Line Items]
Mortgage notes payable	6,350,303				6,424,366
Interest rate			3.82%
Dakota Center
Debt Instrument [Line Items]
Mortgage notes payable	10,007,257				10,111,693
Interest rate			4.74%
Union Terrace
Debt Instrument [Line Items]
Mortgage notes payable	0				6,240,396
Interest rate			4.50%
Centennial Tech Center
Debt Instrument [Line Items]
Mortgage notes payable	0				9,561,654
Interest rate			4.43%
Research Parkway
Debt Instrument [Line Items]
Mortgage notes payable	1,787,129				1,813,305
Interest rate			3.94%
Arapahoe Service Center
Debt Instrument [Line Items]
Mortgage notes payable	8,009,836				8,085,727
Interest rate			4.34%
Union Town Center
Debt Instrument [Line Items]
Mortgage notes payable	8,406,185				8,440,000
Interest rate			4.28%
Executive Office Park
Debt Instrument [Line Items]
Mortgage notes payable	4,783,471				4,839,576
Interest rate			4.83%
Total buildings held-for-sale		4		4
Buildings classified as held for sale | building				1
Genesis Plaza
Debt Instrument [Line Items]
Mortgage notes payable	6,327,800				6,378,110
Interest rate			4.71%
One Park Centre
Debt Instrument [Line Items]
Mortgage notes payable	6,436,968				6,487,532
Interest rate			4.77%
Shea Center II
Debt Instrument [Line Items]
Mortgage notes payable	17,727,500				17,727,500
Interest rate			4.92%
Grand Pacific Center
Debt Instrument [Line Items]
Mortgage notes payable	3,795,623				3,851,962
Interest rate			4.02%
Model Home Properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 31,270,029				$ 32,644,129
Model Home Properties | Minimum
Debt Instrument [Line Items]
Interest rate			2.52%
Model Home Properties | Maximum
Debt Instrument [Line Items]
Interest rate			5.63%
Model Home
Debt Instrument [Line Items]
Number of real estate properties held for sale | property		4

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