Plans and elevations of the proposed building or structure(s) showing the architectural features of all existing and proposed construction and the details of all elements of exterior design, including exterior materials, colors, and texture, roof design (including mechanical equipment which will protrude above the roof), awning and other decorative elements. The plans shall also show the relationship of the proposed structure(s) to neighboring structures as to height, scale, size, design, rhythm, setback, materials, texture, facade treatment, and sign location and treatment. Such information shall be at a scale and of quality to enable the Planning Board to assess the appearance of the proposed structure(s) and their relationship to their surroundings.