The use of charcoal burning, other fuel burning or electric cooking equipment outside of any multi-family dwelling shall be prohibited unless such cooking equipment is at least twenty (20) feet from every part of the building. The provisions of this section shall not apply to townhouses, row houses or other multi-family dwellings where all dwelling units are side by side and none are superimposed above another. (1975 L.M.C., ch. 23, § 1.)