The code official shall serve written notice upon the owner, operator, resident, designated agent or lienholder(s) of record of such building, structure, dwelling or part thereof (and/or exterior property surrounding such building, structure or dwelling) so designated as a public nuisance or attractive nuisance. Service shall be by certified mail/return receipt requested. Where the identity or whereabouts of the owner, operator, resident, designated agent or lienholder(s) cannot be ascertained, notice mailed to the person or persons in whose name the premises were last assessed shall be deemed sufficient notice. (Ord. 2004-O-05 § 3)