10. The open display or storage of goods, products, materials or equipment,
10. The open display or storage of goods, products, materials or equipment, where accessory to a permitted main use conducted in a completely enclosed building on the same premises, subject to the condition that the total ground area devoted to such open use does not exceed twenty-five (25) percent of the ground area covered by said building. In a Limited Industrial District only, such open display or storage shall, if visible at normal eye level from any point beyond the boundaries of the lot and less than five hundred (500) feet distant, be completely screened from such view by wall, fences, or landscaping.