A scaled drawing of the proposed layout of the front yard or street side yard patio must be completed, along with a list of proposed materials to be used in construction, all of which shall be submitted to the Design Review Board for review and approval. All materials must be of high quality, such as cut stone, Lannon or blue stone, or decorative concrete. In addition, the patio surface shall be screened from public view by year-round, continuous, natural vegetation of at least 18 inches in height, such as shrubs, ornamental grasses or perennial plants that provide screening through the winter months. High-quality, decorative masonry or concrete walls, and permanent planters, no higher than three feet as measured from the surface of the patio, may be used in combination with natural vegetation to achieve year-round screening. No fences shall serve as the primary screening materials.