All signs shall be continuously maintained in a state of security, safety, and repair, and shall be painted at reasonable intervals. If any sign is found not to be so maintained or is in need of painting or repair, it shall be the duty of the owner and occupant of premises to repair, paint, or remove the signs within ten days after receiving written notice to do so from the Director of Development Services. If the sign is not so repaired, painted, or removed within such time, the Director of Development Services shall have the power to cause the sign to be removed at the expense of the owner of the premises.