[Amended 6-13-2011 by Ord. No. 713]
Unless otherwise specified by the Board, a conditional use, special exception or variance shall expire if the applicant fails to obtain a zoning permit or a building permit, where required, within 18 months from the date of authorization of the conditional use, special exception or variance, except as such time period may be extended by the Board in its discretion and except as such time period is extended by operation of law.