Reg. C references Reg. Z for it's ag. purpose exemption:
8. Agricultural purpose. An agricultural purpose includes the planting, propagating, nurturing, harvesting, catching, storing, exhibiting, marketing, transporting, processing, or manufacturing of food, beverages (including alcoholic beverages), flowers, trees, livestock, poultry, bees, wildlife, fish, or shellfish by a natural person engaged in farming, fishing, or growing crops, flowers, trees, livestock, poultry, bees, or wildlife. The exemption also applies to a transaction involving real property that includes a dwelling (for example, the purchase of a farm with a homestead) if the transaction is primarily for agricultural purposes.
I think it fits as ag. purpose....but of course, it is ultimately mixed use property, so you'd probably need to determine the primary use of the property.
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I'm fixin' to fix that.