1. No use of land shall be made or any building or structure constructed, altered, remodeled, sold, leased, occupied or used, nor any existing use of a building, structure of land be changed until a zoning use permit and a zoning occupancy permit have been issued by the Zoning Officer.
2. The improvements of land preliminary to any use of such land shall not be commenced prior to the issuance of the zoning use permit.
3. Any permit issued in conflict with the provisions of this Chapter shall be null and void.