The elective officers of a first class city, not including a city adopting the commission or city manager form of government, are a mayor and the number of councilmen determined by the governing body of the city when they provide for the number of wards in the city. The mayor shall be elected at large and the councilmen shall be elected at large or by wards or by a combination of at large and ward election districts. The governing body of the city shall determine by ordinance at the time wards are created or reorganized whether individual, multimember or at large election districts shall be provided. The elective officers of a city or town adopting the commission form of government are a mayor, a commissioner of finance and public property, and a commissioner of streets and public improvements. They are elected at large.
Legislative authority is vested in the council.
If the petition is for a combination of wards and at large, it shall state the number of wards, the number of councilmen to be elected from each ward, and the number of councilmen to be elected at large. The method approved by a plurality vote shall be proclaimed adopted by the mayor. Term of office subject to termination. The term of any municipal elective office is subject to termination if a change of the form of municipal government necessitates a termination of an existing term of office. Councilmen in newly incorporated city or town.