If the owner of such sign or the person in charge, possession or control thereof cannot be found or his or their whereabouts cannot be ascertained, the director shall attach or cause to be attached to said sign, if possible, a notice of the same report that is required to be sent to the owner or person in possession, charge or control thereof where the owner is known. If such sign shall not have been made to conform to this chapter and be placed in secure, safe and substantial condition in accordance with the requirements of such notice within thirty (30) days after such notice shall have been attached to such sign, it shall be the duty of the director to thereupon cause such sign or such portion thereof as is constructed and maintained in violation of this chapter to be torn down, provided that nothing herein contained shall prevent the director from adopting such precautionary measures as may be necessary or desirable in case of imminent danger in order to place such sign in a safe condition, the expense of which shall be charged to and recovered from the owner of such sign or person in charge, possession or control thereof, in any appropriate proceedings therefor or thereafter. (Ord. O-25-98, 11-9-1998)