True story Jim, kinda, so you gotta be very careful in relying on it. We have an Ohio farm client who has been in litigation for over seven years over the details of the ag exemption. In short the county and the township building and zoning do not have jurisdiction over farm buildings but farms are still required to abide by the laws. Fire marshals (usually township fire chiefs) are required to verify that farms accessible to the public meet all building safety standards, which in the absence of county building inspections and occupancy permits can require the farm to pay for expensive third party inspections. Some counties and townships respond to the complications by ignoring farms completely. Others drag it through the courts. Both can be bad. The court case has sucked but so did the kid getting electrocuted at a different nearby farm a couple years ago because the power to an outdoor fridge at a local farm had never been inspected for proper grounds.
