No franchise grant shall in any way or to any extent impair or affect the right of the City to acquire the property of the grantee thereof either by purchase or through the exercise of the right of eminent domain, and nothing herein contained shall be construed to contract away or to modify or to abridge either for a term or in perpetuity the City’s right of eminent domain with respect to any public utility. Every franchise grant shall reserve to the City the right to purchase the property of such utility either at an agreed price or a price to be determined in a manner to be prescribed in the grant, or in the procedural ordinance hereinabove mentioned. In fixing the price to be paid by the City for any utility, no allowance shall be made for franchise value (other than the actual amount paid to the City at the time of the franchise acquisition), goodwill, going concern, earning power, increased cost of reproduction, severance damage, or increased value of right-of-way.