With respect to any franchise, after negotiation or mutual agreement, the council may by ordinance extend the area to include streets, alleys or public places and property not embraced in such franchise when public convenience and necessity requires, subject to all the terms and conditions of such original franchise, and coextensive with the terms thereof without a vote of the registered taxpaying electors. (Ord. No. 91-47, § 1, 11-13-1991)