Neb. Rev. Stat. § 16-672.04

Upon compliance with sections 16-672.01 to 16-672.03 , the mayor and city council may, by ordinance, order the making and construction of the improvements provided for in section 16-672.01 . To adopt such ordinance, a majority of the whole number of members elected to the city council shall be required. If the vote is a tie, the mayor may vote to break such tie.