At any time after the City enters into a franchise agreement with another person to sell natural gas at retail to City consumers and a franchise fee or its lawful equivalent is imposed at zero or at a lesser rate than provided in this ordinance, either the City or the Company may provide written notice to the other to amend the franchise agreement to address the level of the franchise fees then imposed or scheduled to take effect during the term of this franchise agreement. The parties shall have a ninety (90) day period after the date of the written notice to negotiate such an amendment to the franchise agreement. The parties may negotiate changes in the levels of fees during this period, or, if they cannot agree upon such an amendment, either party shall have the unilateral right to terminate the franchise.