No land shall be used, no use shall be commenced and no structure
shall be erected, constructed, reconstructed, altered, converted,
and no land, use or structure shall be changed from an existing use
to a new use until a zoning permit is issued by the Zoning Officer,
stating the use, structure or building conforms and complies with
the provisions of this chapter or that a variance has been granted
from the appropriate provisions of this chapter by a Board of competent
jurisdiction.