Subject to any right to appeal the City’s decision under this code and state and federal law, the determination under this Chapter of the applicant’s Proportionate Contribution to the Necessary Improvements of the public facility shall be final and neither the applicant, nor the applicant’s successors and assigns, shall be entitled to a refund or credit in the event the total actual costs to the City of the Necessary Improvements are less than the Improvement Costs. Similarly, the City shall not be entitled to seek additional contribution from an applicant or the applicant’s successors and assigns if the total actual costs to the City of the Necessary Improvements exceeds the Improvement Costs. This section does not preclude reimbursement of amounts paid in excess of the Proportionate Contribution pursuant to an agreement between the City and applicant, or as may otherwise be required by ordinance, statute, or other law.