It shall be the duty of the building inspector to serve or cause to be served, by mail, upon the owner or lienholders of record of the real estate in question a written notice demanding that the building be repaired to a safe condition or demolished. If, after fifteen (15) days, neither the owner nor any of the lienholders of record have repaired or demolished the building, the city council may authorize the municipal attorney to apply to the circuit court of Bureau County for an order authorizing the city to demolish, repair, cause demolition or repair of any dangerous, unsafe, uncompleted or abandoned buildings. Where, upon diligent search, the identity or whereabouts of the owner or owners of any such building or the lienholders of record are not ascertainable, notice mailed to the person or persons in whose name such real estate was last assessed is sufficient notice under this section. (Ord., 7-1-1985)