Authorization of a conditional use shall be void after one year from the date of final decision unless substantial construction or development in conformance with the plan has occurred. However, the planning commission may extend authorization for an additional period not to exceed one year, upon request. Within 90 days of the affirmative decision by the approval authority, a complete final site development plan map shall be prepared and filed with community development, including all required modifications and conditions. Approved conditional use permits that do not have a complete final site development plan map submitted within 90 days of the original approval shall be void. [Ord. 817 § 8-3L.270, 2006.]