If the authorized city official finds that any sign or other advertising structure is prohibited by the provisions of this chapter the authorized city official shall give written notice to the permittee or the owner of the property upon which the structure is located. If the permittee or owner fails to remove or alter the structure so as to comply with the standards set forth in this chapter within ten days after such notice, the authorized city official may undertake such removal or alteration as is necessary to bring the structure into compliance and assess the costs to the permittee or owner. The authorized city official may cause any sign or other advertising structure which presents an immediate peril to persons or property to be removed or altered immediately and without notice.