No building, structure, or improvement shall be permitted to encroach upon required yard spaces set forth in the provisions of this title; provided, however, that surfaced parking facilities, signs, fences, and gasoline pumping service units may be permitted to occupy required yard space unless otherwise prohibited in those districts permitting such improvements and provided that no inoperative vehicle may be stored in the front yard of a lot in a residential district. (Ord. 939, 11-14-2011)