No contract involving the payment of money out of the appropriations of more than one year, except public utility contracts, shall be made for a period of more than ten years or otherwise than by ordinance; and no ordinance providing for such a contract shall be valid without public notice at least two weeks before passage by the commission and the approval of not less than seventy-five per cent of the members of commission, unless submitted to the electors of the city at a regular or special election and approved by a majority of those voting thereon.
(Adopted by electorate, November 7, 1978 – Amending Ordinance No. 2-88)