On application to the Land Use Board and notice of the application as provided by § 18-29, the Board may extend simple variances for a period of one year, not to exceed two such one-year extensions for good cause shown. In all such cases, in addition to the reasons for the delay and any hardship the applicant asserts will be occasioned by the expiration of the variance, the Board shall consider all relevant changed circumstances, including but not limited to changes in the Township's Master Plan or development regulations, changes in the subject property and changes in the surrounding area.