Whenever in the opinion of the Construction Code Official any sign becomes unsafe or endangers the safety of the building or premises or the public safety, the Construction Code Official shall send a certified letter to the owner of the sign or the premises on which the sign is located, ordering that the sign be made safe or be removed within five days of receipt of the letter. If the sign is not removed or repaired within 30 days after the notice, the sign may be removed, altered or repaired, in order to comply with the Construction Code Official, at the expense of the permittee or owner of the property on which the sign is located. The Construction Code Official may cause any sign or sign structure to be removed summarily and without written notice if it is an immediate peril to persons or property by virtue of its construction or moorings.