Here are the guidelines for buying property under the USDA guaranteed home loan
https://www.rd.usda.gov/files/3555-1chapter12.pdf
Income-Producing Land. The site must not have income-producing land that will be used principally for income producing purposes. Vacant land or properties used primarily for agricultural, farming or commercial enterprise are ineligible.
Income-Producing Buildings. The property must not include buildings principally used for income-producing purposes. Barns, silos, commercial greenhouses, or livestock facilities used primarily for the production of agricultural, farming or commercial enterprise are ineligible. However, barns, silos, livestock facilities or greenhouses no longer in use for a commercial operation, which will be used for storage do not render the property ineligible. Outbuildings such as storage sheds and non-commercial workshops are permitted if they are not used primarily for an income producing agricultural, farming or commercial enterprise. A minimal income-producing activity, such as
maintaining a garden that generates a small amount of additional income, does not violate this requirement. Home-based operations such as childcare, product sales, or craft production that do not require specific commercial real estate features are not restricted.
