If any owner or occupant of property, or other person responsible described in the notice provided for in this chapter, shall fail to abate the described nuisance conditions in accordance with such notice, the community development administrator is authorized to employ necessary assistance and abate the nuisance. The community development administrator shall prepare an itemized statement of all expenses incurred in the abatement of the nuisance conditions and shall mail a copy thereof to the owner demanding payment within thirty (30) days of the date of mailing. Such notice shall be deemed delivered when mailed by registered mail and addressed to the last known address of the property owner, occupant or person responsible. (1998 Code § 8.16.160)