The sale of non-automotive retail items, such as convenience goods including, but not limited to, beverages, food, candy, snacks, maps, toiletries, and hardware items, shall be permitted only inside the building. A specific area of the building may be designated for the sale of convenience goods only if included as part of the conditional use permit for the service station. Any new construction for the sale of convenience goods, or the conversion of existing office space or an existing service bay to such a purpose, shall require amendment to the existing conditional use permit or approval of a new conditional use permit. The use of less than 50 square feet of existing office space or service bays for the placement of coin operated dispensers, refrigerated cases, or display racks shall not require an amended conditional use permit. Vending machines may be placed outside, adjacent to the building in a designated area not to exceed 32 square feet, if screened from public view.