dministrator, the Area Planning Commission shall make its decision within 15 days (in the case of a revocation, within 10 days) after the expiration of the appeal period, or within an extended period of time as may be mutually agreed upon in writing by the applicant and the Area Planning Commission. The Area Planning Commission shall base its decision only upon: (i) evidence introduced at the hearing, or hearings, if any, before the Zoning Administrator, on the issue; (ii) the record, findings and determination of the Zoning Administrator; and (iii) the consideration of arguments, if any, presented to the Area Planning Commission orally or in writing. If an applicant or aggrieved person wishes to offer into the proceedings any new evidence in connection with the matter, a written summary of that evidence, together with a statement as to why that evidence could not reasonably have been presented to the Zoning Administrator shall be filed with the Area Planning Commission prior to the hearing. If the Area Planning Commission fails to act on any appeal within the time limit specified in the subsection, the determination of the Zoning Administrator shall be final. The Area Planning Commission may modify or reverse the ruling, decision or determination appealed from only upon making findings indicating how the action of the Zoning Administrator was in error or constituted an abuse of discretion and shall make specific findings supporting any modification or reversal. The decision of the Area Planning Commission shall be final as of the date of its determination on the matter. After making a decision, a copy of the findings and determination shall forthwith be placed on file in the City Planning Department and a copy of the determination shall be furnished to the applicant, the appellant and the Department of Building and Safety.