Organization and Business	3 Months Ended
Organization and Business	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business Hartman Short Term Income Properties XX, Inc. (the “Company”), is a Maryland corporation formed on February 5, 2009. The Company elected to be treated as a real estate investment trust (“REIT”) beginning with the taxable year ending December 31, 2011. As used herein, the “Company,” “we,” “us,” or “our”refer to Hartman Short Term Income Properties XX, Inc. and its consolidated subsidiaries, including Hartman XX Limited Partnership, a Texas limited partnership (the “Operating Partnership”), except where context otherwise requires. On July 19, 2018, we entered into a limited liability company agreement with our affiliates Hartman Income REIT, Inc. (“HIREIT”), Hartman Short Term Income Properties XIX, Inc. (“Hartman XIX”) and Hartman vREIT XXI, Inc. (“vREIT XXI”) to form Hartman SPE, LLC ("SPE LLC"), a special purpose entity. On October 1, 2018, SPE LLC, as borrower, and Goldman Sachs Mortgage Company entered into a term loan agreement pursuant to which the lender made a term loan to SPE LLC in the principal amount of $259,000,000. Contemporaneously therewith and together with our affiliates HIREIT, Hartman XIX and vREIT XXI, we contributed a total of 39 commercial real estate properties ("Properties") to SPE, LLC, subject to the then existing mortgage indebtedness encumbering the Properties, in exchange for membership interests in SPE LLC. Proceeds of the Loan were immediately used to extinguish the existing mortgage indebtedness encumbering the Properties. Substantially all of our business is conducted through our wholly owned subsidiary, the Operating Partnership, and SPE LLC. Our wholly-owned subsidiary, Hartman XX REIT GP LLC, a Texas limited liability company, is the sole general partner of the Operating Partnership. We are the sole limited partner of the Operating Partnership. Our wholly-owned subsidiary, Hartman SPE Management, LLC ("SPE Management") is the manager of SPE LLC. Our single member interests in our limited liability company subsidiaries are owned by the Operating Partnership or its wholly owned subsidiaries. Subject to certain restrictions and limitations, Hartman Advisors LLC ("Advisor") is responsible for managing our affairs on a day-to-day basis and for identifying and making acquisitions and investments on our behalf pursuant to an advisory agreement (the “Advisory Agreement”) by and among the Company and Advisor. Management of the Company’s properties and the Properties, is provided pursuant to property management agreements with Hartman Income REIT Management, Inc. (the "Property Manager"), a wholly-owned subsidiary of HIREIT. As of March 31, 2020 and 2019, the Company owned 43 commercial properties comprising approximately 6.7 million square feet plus three pad sites, all located in Texas. As of March 31, 2020 and 2019, the Company owned 15 properties located in Richardson, Arlington and Dallas, Texas, 25 properties located in Houston, Texas and three properties located in San Antonio, Texas. On July 21, 2017, the Company and Hartman Short Term Income Properties XIX, Inc. (“Hartman XIX”), entered into an agreement and plan of merger (the “XIX Merger Agreement”). On July 21, 2017, as subsequently modified on May 8 2018, the Company, the Operating Partnership, Hartman Income REIT, Inc. (“HIREIT”) and Hartman Income REIT Operating Partnership LP, the operating partnership of HIREIT, (“HIROP”), entered into an agreement and plan of merger (the “HIREIT Merger Agreement,” and together with the XIX Merger Agreement, the “Merger Agreements”). On May 14, 2020, the Merger Agreements were approved by the respective company shareholders. The effective date of the Mergers is expected to be July 1, 2020.