Maintenance. All signs, including official signs, together with all their supports, braces, hooks, guys and anchors, shall be of substantial and sturdy construction, shall be kept in good repair, and shall be painted or cleaned as often as necessary to maintain a clean, neat, legible, safe and orderly appearance. All lighting elements shall be kept in good working order when lighting is provided. The area surrounding ground signs shall be kept neat, clean and landscaped. The owner of the property, or his designee, upon which the ground sign is located shall be responsible for maintaining the condition of the area.