If it is determined that an emergency exists by reason of the continuing maintenance of the nuisance or condition, the city may perform any action which may be required to abate the nuisance or condition without prior notice. The city shall assess the costs in the manner set out in this chapter, after notice to the property owner under the applicable provision of §§ 3.00 and 4.00 of this chapter and hearing as provided in § 6.00 of this chapter.