Stage 3 - Final Approval. Within one year after approval of the preliminary plan, the applicant shall file a final plan for the entire development. If submission in phases has been authorized, the final plan will be approved in phases. The final plan shall be sufficiently detailed to indicate fully the ultimate appearance of the planned development. Copies of legal documents required for dedication or reservation of public facilities or for deed restrictions, management agreements, etc., shall also be submitted. Upon receipt of the final plan, the city administrator or the city administrator's designee shall examine such plans and documents to determine whether they substantially conform to the previously approved preliminary plan and the stipulations of the conditional use permit. If the city administrator or the city administrator's designee should require any changes, the administrator shall permit the applicant to revise the plan and/or documents and resubmit the final plan within 60 days. The decision of the city administrator shall be final subject to the procedures of subsection (4) of this section. Final approval, either for a phase or for the entire plan, shall be valid for a 12-month period. The city administrator or the city administrator's designee may extend approval for an additional one-year period, provided a written request from the applicant is submitted prior to the expiration date, stating the reason why an extension should be granted.