SECTION 108 VALUE OF GRANT EXCLUDED.
   No ordinance granting or renewing a public utility franchise shall be valid unless it expressly provides that the price to be paid for the property of the utility, in case of acquisition by the city, shall exclude all value of such franchise or renewal; and in determining the fair value of the property of a public utility, for the purpose of permitting a reasonable return thereon, no allowance shall be made for the value of any franchise.