Except as permitted by other provisions of this Zoning Code, no lot or parcel may be improved with a building or structure unless the front lot line of such lot abuts fully on a publicly dedicated street. Further, no lot or parcel may be improved with a building or structure unless the lot satisfies the frontage and minimum lot dimension and area requirements of the zoning district in which it is located, or satisfies the provisions of a lawfully granted zoning variance.