[Amended 1-13-1997 by Ord. No. 96-14]
A variance or special use permit shall expire one year from the date of granting by the Zoning Board of Review unless the applicant exercises the permission granted, or received a zoning permit to do so, and commences substantial construction or use and diligently prosecutes the same until completion, except, however, that such expiration shall not apply to a special use permit granted under the provisions of § 185-29 relating to the unmerger of substandard lots of record. The Board may, upon application therefor and for cause shown, grant an extension. No more than one extension for an additional period of one year may be granted, except where the applicant has experienced delay in obtaining state or federal agency approval and has otherwise diligently pursued the permission granted.