Architectural design. Architectural details of the particular style and period proposed should be incorporated into the design for any new construction, and color, size, height, proportion of openings, roof treatments, and building materials shall relate harmoniously to adjacent buildings. It is not intended that the architectural details of old buildings be duplicated precisely, but they should be regarded as a guideline for the extent, nature, and scale of constructional features that would be appropriate on new buildings or alterations. Roof structures shall be hipped or gabled in appearance as seen from any public way. Flat roofs seen from a public way shall not be permitted. Roofs shall project enough beyond the facade to create an overhang and cast a strong shadow. Other desirable architectural features, where appropriate for a particular style, include multipane windows (12 over 12, six over six), chimneys, porches, shutters, gothic arches, white columns and entablatures, and fanlights. Examples of designed architectural styles include Colonial, Georgian, Federal, Greek Revival, Romantic Revival, and Victorian styles. The removal or disruption of historic traditional or significant structures or architectural elements shall be minimized.