All buildings, poles, towers, antenna supports, antennas, and other components of each wireless communications site shall initially be colored with flat, muted tones. The color selected shall be one that in the opinion of the review authority minimizes visibility of the WCF to the greatest extent feasible. Wireless communications storage facilities (i.e., vaults, equipment rooms, utilities, and equipment cabinets or enclosures) shall be constructed of nonreflective materials (exterior surfaces only). The placement of equipment in underground vaults is encouraged;