An "ancillary game arcade" is any place of business to which the public is admitted wherein any electronically, electrically or mechanically controlled amusement machines are maintained in conjunction with a primary use other than amusement games occupying less than 20% of the usable floor space in the building or unit in which it is located.
(`78 Code, § 17.04.043.) (Ord. 1982 § 1, 1990.)