Notwithstanding any other provisions of this chapter, a municipality shall have authority to enact, and may by ordinance authorize, the appropriate city official to initiate immediate repair or demolition of a building structure when, in the opinion of the official so designated, such emergency action is required due to imminent danger of structural collapse endangering adjoining property, the public right of way, or human life or health. The cost of the emergency action shall be fixed by the municipal governing body and shall be assessed as provided in the ordinance, or, if such ordinance does not provide a method of assessment, as provided by this chapter.