Hello,
You should have been applying for a variance or a conditional use permit in order to continue operation. If your application has been denied, depending on your local zoning act, you can file suit to appeal it to a local appeals board. If you are denied again, you can file suit to challenge the decision in court as being an abuse of power and arbitrary and unreasonable. If you have been operating since 2005 with no problems, then you can also argue that the city is "estopped" from bringing a violation now as they were aware of your use all along and have waived their right to bring a violation now.
Another ground you could assert is that they are prevented from asserting a violation under the doctrine of "laches". It is defined as neglect to assert a right or claim that, together with lapse of time and other circumstances, prejudices an adverse party. Neglecting to do what should or could, have been done to assert a claim or right for an unreasonable and unjustified time causing disadvantage to another.
If you believe you have been discriminated against based on your sex, and can prove it, then you may have grounds for a civil rights discrimination lawsuit against the County.
Thanks.
Matt
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9 years experience in real estate, estate planning, and criminal law