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MORTGAGE NOTES PAYABLE (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Mortgage notes payable	$ 128,002,720	$ 143,459,048
Unamortized loan costs	(879,175)	(1,066,056)
Mortgage notes payable, total net	127,123,545	142,392,992
Garden Gateway Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,019,844	6,071,315
Interest rate	5.00%
Maturity	Aug. 05, 2021
Fixed interest rate on mortgage (in hundredth)	5.00%
World Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,953,556	4,979,383
Variable Interest Rate	4.41%
Maturity	Jul. 05, 2020
Weighted average interest rate	4.41%
World Plaza | ABR
Debt Instrument [Line Items]
Variable interest rate on mortgage (in hundredth)	0.75%
World Plaza | LIBOR
Debt Instrument [Line Items]
Variable interest rate on mortgage (in hundredth)	2.75%
West Fargo Industrial
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,196,788	4,216,565
Interest rate	4.79%
Maturity	Sep. 06, 2020
Fixed interest rate on mortgage (in hundredth)	4.79%
Waterman Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 3,254,223	3,274,097
Interest rate	5.78%
Maturity	Apr. 29, 2021
Fixed interest rate on mortgage (in hundredth)	5.78%
300 N.P.
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,302,197	2,311,738
Interest rate	4.95%
Maturity	Jun. 11, 2022
Fixed interest rate on mortgage (in hundredth)	4.95%
Highland Court
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,387,511	6,424,366
Interest rate	3.82%
Maturity	Sep. 01, 2022
Fixed interest rate on mortgage (in hundredth)	3.82%
Dakota Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 10,059,135	10,111,693
Interest rate	4.74%
Maturity	Jul. 06, 2024
Fixed interest rate on mortgage (in hundredth)	4.74%
Union Terrace
Debt Instrument [Line Items]
Mortgage notes payable	$ 0	6,240,396
Interest rate	4.50%
Maturity	Sep. 05, 2024
Fixed interest rate on mortgage (in hundredth)	4.50%
Centennial Tech Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 0	9,561,654
Interest rate	4.43%
Maturity	Jan. 05, 2024
Fixed interest rate on mortgage (in hundredth)	4.43%
Research Parkway
Debt Instrument [Line Items]
Mortgage notes payable	$ 1,800,281	1,813,305
Interest rate	3.94%
Maturity	Jan. 05, 2025
Fixed interest rate on mortgage (in hundredth)	3.94%
Arapahoe Service Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 8,047,511	8,085,727
Interest rate	4.34%
Maturity	Jan. 05, 2025
Fixed interest rate on mortgage (in hundredth)	4.34%
Union Town Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 8,416,833	8,440,000
Interest rate	4.28%
Maturity	Jan. 05, 2025
Fixed interest rate on mortgage (in hundredth)	4.28%
Executive Office Park
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,811,730	4,839,576
Interest rate	4.83%
Maturity	Jun. 01, 2027
Fixed interest rate on mortgage (in hundredth)	4.83%
Genesis Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,352,694	6,378,110
Interest rate	4.71%
Maturity	Sep. 06, 2025
Fixed interest rate on mortgage (in hundredth)	4.71%
One Park Centre
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,461,980	6,487,532
Interest rate	4.77%
Maturity	Sep. 05, 2025
Fixed interest rate on mortgage (in hundredth)	4.77%
Shea Center II
Debt Instrument [Line Items]
Mortgage notes payable	$ 17,727,500	17,727,500
Interest rate	4.92%
Maturity	Jan. 05, 2026
Fixed interest rate on mortgage (in hundredth)	4.92%
Grand Pacific Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 3,823,965	3,851,962
Interest rate	4.02%
Maturity	Aug. 01, 2037
Fixed interest rate on mortgage (in hundredth)	4.02%
Presidio Property Trust, Inc. properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 94,615,748	110,814,919
Model Home properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 33,386,972	$ 32,644,129
Model Home properties | Minimum
Debt Instrument [Line Items]
Interest rate	3.44%
Fixed interest rate on mortgage (in hundredth)	3.44%
Model Home properties | Maximum
Debt Instrument [Line Items]
Interest rate	5.63%
Fixed interest rate on mortgage (in hundredth)	5.63%

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