From the ordinance
Unless the contrary is clear from the context of the list of permitted uses or other regulations contained within this Ordinance, uses not specifically permitted are prohibited, except that a use may be declared by the Planning Commission and Mayor and Council to be allowed upon application following public hearing and finding that: 1. The use reflects the nature of the permitted uses; and 2. That there is no appreciable difference in the quality, character, or degree of the requested use as compared with the permitted uses.