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I am sorry to hear about this situation. The answer is "yes and no."
Unless the county/municipal ordinances specifically allow for a "grandfather clause" (normally they do not), there is no state law that specifically allows a grandfathered in situation here.
However, there are two ways to challenge it. First, it is to go to the zoning meeting (as normally, they are open to the public) and argue against it. Even if it is still rezoned, the second method is to request a a variance which allows one to continue using property one way even if it has been rezoned. This is actually often granted if the party can show that they have been there a long time and that the variance would not cause issues with adjoining, other properties that have been rezoned.
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