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In the districts indicated, all such activities within 300 feet of a Residence District boundary shall be located within completely enclosed buildings, provided, however, that commercial uses may be located within buildings which are completely enclosed except for store fronts or store windows which may be opened to serve customers outside the building. All such activities beyond 300 feet of a Residence District boundary may be conducted outside a completely enclosed building, and any enclosure requirements set forth in Sections 42-11 through 42-20 need not apply.