The owner, agent, occupant or person in charge of each and every tenement, building or vacant property fronting upon or adjoining any street on which sidewalks exist shall clean by noon the sidewalk in front of or adjoining such building, or unoccupied lot or building, as the case may be, of snow or ice to the width of said sidewalk and cause the same to be kept clean from snow or ice. (Ord. 322-74 § 2, 1974.)