Whenever permanent sign is erected or maintained in violation of this §
16-11 or this Code, the Zoning Official shall send a letter by certified mail to the owner of said sign and/or the owner of the premises on which the sign is located, ordering that such sign shall be brought into conformity with this §
16-11 and this Code within 30 days. If the sign is not brought into conformity or removed by the end of the thirty-day period, the Zoning Official may cause the same to be removed at the expense of the owner of the sign and the owner of the premises on which the sign is located.