For
each nonresidential use or structure of over one thousand (1,000)
square feet of gross floor or ground area in which commodities are
sold, displayed, serviced, repaired, altered or fabricated as the
principal use of the parcel or lot, one off-street loading space of
at least four hundred fifty (450) square feet in area and having a
minimum overhead clearance of at least fourteen (14) feet shall be
provided.