Pavers; stair treads not of metal; non-metallic paving blocks; construction elements, namely, non-metal paver supports; non-metal tiles; paver tiles; non-luminous, non-mechanical signs not of metal; non-metal bollards, namely, concrete bollards and plastic bollards; bicycle storage racks, not of metal; and non-metallic landscape site amenities, namely, concrete bird baths, concrete sculptures, and pre-cast concrete wall forms