Storefront Windows. Storefront windows shall have a minimum vertical height of six feet for visual uniformity. Storefront windows may be divided into recessed vertical or horizontal panels, have a round or circular shape, or a sunken arch frame. Windows must be made of clear, tempered or reinforced glass panels and installed on the wall base to the underside of the ceiling or soffit. The wall base for the storefront window shall have a minimum height of twelve inches above the sidewalk. The base shall be finished with brick, colorful tile, a polished slab of marble, granite, or veneer. Upper-story windows shall use recessed window panels or vertical or horizontal elements such as piers, mullions, headers and sills. If ground floor security is used, metal gates, screens, mall-style roll-up doors and scissor-style security grilles (retracted into casings) shall be installed behind exterior doors and storefront windows and shall be stored in wall pockets or similar enclosures so as not to be visible during business hours.