It looks like there may be a 250 hour minimum of rental services to qualify for the QBI. See Rev Notice 2019-7 https://www.irs.gov/pub/irs-drop/n-19-07.pdf  And a shorter explanation:
 https://www.kitces.com/blog/irs-notice-2019-07-199a-qbi-deduction-250-hours-safe-harbor-rental-real-...