The setback building line shall be fifty feet from the front lot line dividing the lot from the street. However, whenever twenty percent or more of the lots on any street have dwellings existing thereon, as of the effective date of this Zoning Code (Ordinance 56-5-6, passed June 19, 1956), the setback building line for any such street shall be construed to be the median of the setback building lines of the existing dwellings on such street, but in no event shall the setback building line be less than forty feet, provided that the setback building lines in Business and Industrial Districts shall not be less than as specified in Sections 1250.05 and 1254.03.
(Ord. 56-5-6. Passed 6-19-56.)