Summary of Significant Accounting Policies (Details)				3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 01, 2019 shares	Feb. 28, 2019	Oct. 01, 2018	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) financial_institution shares	Dec. 31, 2018 USD ($) shares
Schedule of Equity Method Investments [Line Items]
Impairment of real estate									$ 0
Prepaid expenses and other assets									573,378	$ 289,148
Acquisition deposit									1,850,000	110,000
Organization and offering costs incurred									1,377,924
Organization and offering costs									183,521	119,982
Net loss				$ 339,597	$ 246,946	$ 260,975	$ 507,921	$ 847,518	1,084,902	1,292,229
Deferred income tax expense (benefit)									0	0
Deferred tax assets									$ 0	$ 0
Antidilutive securities | shares									0	0
Number of financial institutions | financial_institution									1
Loss on deposits									$ 0
Hartman Three Forest Plaza LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage			48.80%
Hartman SPE, LLC | Common Stock
Schedule of Equity Method Investments [Line Items]
Number of shares received in exchange for ownership interest (in shares) | shares	700,302
Proceeds From Sale Of Common Stock | Organization And Offering Costs
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage									15.00%
Revenue | Customer Concentration Risk | Spectrum Building
Schedule of Equity Method Investments [Line Items]
Concentration risk percentage									19.00%
Variable Interest Entity, Not Primary Beneficiary | Hartman SPE, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	2.47%	5.89%	5.89%
Ownership percentage disposed of	3.42%