The architecture of the parcels within the PUD shall be consistent in character and materials, so as to appear as a unified development. The architectural design and use of materials for the construction of any building within the PUD shall be accomplished in a manner compatible with PCP professional commerce park zone district building standards. The architectural design of any building shall be acceptable to the city and all buildings within the parcel shall have as a primary element of the exterior being fascia glass, face brick, concrete panels, architectural steel or stone panels, with all sides of any building built on a parcel consistent in design and use of materials. No wood, masonite, visible asphaltic exterior wall or roof material, aluminum siding, nonarchitectural sheet metal, concrete block, decorative concrete block, or other similar materials shall constitute a portion of any building except as a trim material, unless the city council of West Des Moines, after having received a recommendation from the planning and zoning commission of West Des Moines, shall determine said material when used as a primary element, enhances the physical appearance, or provides continuity desired to unite all structures within the PUD together into one project concept. (Ord. 1078, 1-3-1994)