Depending on the local development code you may need a variance or other change to allow what you want. Go see the building officials and discuss what your options are, they may so no initially. Be patient and read the local rules. If it seem impossible go see a local land use lawyer.
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You will need to consult a land use lawyer. Some jurisdictions don't allow piecemeal rezoning, while others do.
If you were in Maryland, you'd have to request a change by introducing an amendment or participate in what's called a "comprehensive rezoning" if your locality is currently undergoing that process.