No building in the rear of a principal building on the same lot shall be used for residential purposes unless it conforms to all the yard and other open-space and off-street parking requirements of this Zoning Ordinance, and for the purpose of determining the front yard in such cases, the rear line of the required rear yard for the principal building in front shall be considered the front line of the required front yard for the building in the rear. In additions there shall be provided for any such rear dwelling an unoccupied and unobstructed accessway not less than ten feet wide to a public street for each dwelling unit in such dwelling or not less than thirty feet wide for three or more dwelling units.
(Ord. 12-1966. Passed 10-10-66.)