All signs, together with all their supports, braces, hooks, anchors, and other related fastening devices, shall be of substantial and sturdy construction with durable materials, shall be kept in good repair, and shall be maintained as often as necessary to maintain a clean, neat, safe and orderly appearance. The area surrounding the sign and the mounting area on the ground level beneath permitted freestanding signs shall also be maintained in a clear, neat, safe, and orderly condition and shall not be allowed to become dilapidated or unsightly.