1.5, C2, C4, C5, CM, M1, M2 and M3 Zones. In addition to the findings otherwise required by this section, the Zoning Administrator shall also consider whether the proposed use will result in an over-concentration of this use in the area, and the number of firearms available for sale at the site. 42. The sale of merchandise : (a) From a privately owned vacant lot in the C1, C2, M2, and M3 Zones in the open; (b) From a drive-in theater in the M2 and M3 Zones in the open; or (c) At an indoor swap meet in the C1, C1.5, C2, C4, C5, M1, M2, and M3 Zones. For purposes of this paragraph, the following definitions shall apply: (1) “ Indoor swap meet ” shall mean any event where new or secondhand goods are offered or displayed for sale or exchange by ten or more independent vendors within a completely enclosed building. An independent swap meet vendor is any individual, partnership, corporation, business association or other person or entity who is not an employee of the owner or lessee of the subject building; and (i) A fee is charged by a swap meet operator for the privilege of offering or displaying new or secondhand goods for sale or exchange; or (ii) A fee is charged to prospective buyers for admission to the area where new or secondhand goods are offered or displayed for sale or exchange. (2) “ Mini-shopping center ” shall mean any development, (i) with a lot area of less than forty-five thousand square feet, used for two or more retail sales, services or restaurants, or their combination; (ii) with the structure or structures located in close proximity to the rear lot line and/or side lot line, and (iii) with surface parking situated between the structure or structures and the street. (3) A “ shopping center ” or “ industrial center ” is defined as a unit group of buildings used for commercial and/or industrial purposes together with open space and vehicle parking areas where the occupants of the buildings and their customers have a joint right to use the open space and vehicle parking areas. EXCEPTIONS: The provisions of this subdivision shall not apply to a retail store or shop in a “mini-shopping center”, in a “shopping center” or in an “industrial center” as defined in Subparagraphs (2) and (3) above, unless that store or shop is being used as the location of an indoor swap meet as defined in Subparagraph (1) above. 43.