Awnings shall be encouraged on retail buildings. All awnings shall be constructed and installed so that the frame and fabric of the awning is integrated into the overall building design. No awning shall extend more than four feet from the building facade, except that awnings in the B-3 zone shall extend to a dimension appropriate with the size and scale of the subject building, and no awning shall be less than eight feet above the ground. Awnings which project into any roadway, driveway, parking or loading area are prohibited. Awnings shall not be placed so as to conceal or disfigure an architectural feature or detail. Awning materials shall be limited to cloth, canvas and similar materials; metal and aluminum awnings are prohibited. Awnings should be solid or striped and of colors specified in Subsection 152.4f.