A variance shall lapse and become void one year following the date on which the variance became effective, unless prior to the expiration of one year, a building permit is issued by the building official and construction is commenced and diligently pursued toward completion on the site that was the subject of the variance application, or a certificate of occupancy is issued by the building official for the site or structure that was the subject of the variance application. A variance may be renewed for an additional period of one year; provided, that prior to the expiration of one year from the date when the variance became effective, an application for renewal of the variance is made to the commission. The commission may grant or deny an application for renewal of a variance. (Ord. 2017-01 (part), 2017: Ord. 2006-18 § 7, 2007: prior code § 7567)