Front line setbacks shall be required whenever the planning commission, in the exercise of sound judgment, determines that the public health, safety, convenience, and general welfare will be conserved or furthered by such requirements. They may also be required in lieu of street widenings. When required, such building lines shall be indicated on the map at the distance from the street lines as specified. The requirement by the planning commission of such setback lines shall be evidence that the planning commission has investigated and made a finding supporting such decision. (1962 Code § 10-903; amd. Ord. 75-O-1561, eff. 3-4-1975)