If the City Building Inspector or designee shall find that any sign subject to the sign regulations of this chapter is unsafe or insecure or is a menace to the public or has been constructed or erected or is being maintained in violation of the provisions of the sign regulations, the City Building Inspector shall give written notice thereof to the person in possession and control of the premises on which the sign is located. If such person fails to remove or alter the sign so as to comply with the provisions of the sign regulations within thirty (30) days of such notice, such person commits a municipal infraction. If a sign is an immediate hazard, the City Building Inspector may cause it to be removed immediately or may take such action as is necessary to protect the public from immediate hazard. A permit for a sign is a license revocable at any time by the Council subsequent to notice to the permit holder and an opportunity for the permit holder to be heard by the Council.