It shall be an offense for any person who owns, operates or is employed by a business establishment which serves alcoholic liquor or permit such establishment to remain open to the public between the hours of 2:30 a.m. and 6:00 a.m. whether or not alcoholic beverages are being served during such period of time. (Ord. 1775 §§ 1, 2, 1991; Ord. 1612 § 1, 1980; Ord. 1547 § 17, 1977)