DISTRICTS AND ZONES buildings and accessory structures (including canopies) shall be appropriate to the scale of structures. (2) Proportions of Bays and Openings: All building bays, including porches, colonnades and porticos as appropriate, shall be square or vertical in proportion, unless the design merits a horizontallyproportioned opening. Wall openings, with the exception of transoms and storefronts, shall be square or vertical in proportion. The facade of a proposed building should draw upon the proportion and number of bays in surrounding buildings, as defined by windows, doors, and column spacing, to establish a compatible scale. (3) Building Materials: Building wall materials shall be combined on each facade only horizontally, unless the building is broken vertically by a change of plane, or a vertical architectural element. Heavier materials, such as masonry and stucco, shall be located below lighter materials, such as cement fiber or wood siding. (4) Roof Forms: Where pitched roofs exist, primary roofs shall have a minimum slope of 4:12, while ancillary roof slopes may be no less than 2:12. (5) Garages and Accessory Structures: Attached garages, detached garages, and other accessory structures shall be subordinate in height, footprint, and proportion to the primary structure on the site, and shall be compatible with the principal structure in terms of roof form, materials, and color. Where a garage contains an accessory dwelling unit above, it may exceed the height of the primary structure. (6) Trash, Mechanical, Utility and Service Equipment and Areas i. Loading docks, service areas, and trash disposal facilities (e.g., 36 trash and recycling receptacles, compactors, dumpsters) shall be hidden or screened from view of streets, parks, squares, or significant pedestrian spaces. Loading areas may be oriented toward adjoining developed properties that are zoned for nonresidential uses, if such loading areas are screened from view. ii. Mechanical equipment, such as ventilation systems, commercial exhaust fans, rooftop terminations, commercial cooling equipment, heating and air conditioning units, TV antennas, and satellite dishes, shall be hidden or screened from view. Lattice, open brick enclosures, or vegetation can be used to conceal mechanical equipment. Screening material shall be properly maintained. If vegetation is used for screening, the mature size of the vegetation shall be considered so that equipment air flow will not be compromised. (7) Colors: Buildings and additional site elements — e.g., bollards, arbors, drive-thru canopies, sign posts — shall not be painted in a color or pattern that expresses corporate identify, to the extent that the paint color or pattern is not consistent with the design standards of the district. Fluorescent colors, such as ASHTO safety yellow, are also prohibited except where required by a public agency. D. Specific Standards (1) Building Materials and Details. i. Building walls shall be finished in 1 or more (but not more than 3) of the following materials: (a) Wood;
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