A. If a variance is granted or the issuance of a permit is approved, or other action by the appellant is authorized, the necessary permit shall be secured and the authorized action begun according to the stipulations set form in this Part as found in § 600-301E through H.
B. Should the appellant or applicant fail to obtain necessary permits within a twelve-month period from the date of approval, or having obtained the permit should he or she fail to commence work thereunder within that twelve-month period, it shall be conclusively presumed that the appellant or applicant has waived, withdrawn or abandoned its appeal or application, and all provisions, variances and permits granted to him or her shall be deemed rescinded by the Board without further action.
C. Should the appellant or applicant commence construction or alteration within said twelve- month period, but should he or she fail to complete such construction or alteration within a twelve-month period, the Board may, upon 10 days' notice in writing, rescind or revoke the granted variance, or the issuance of the permit, or the other action authorized to the appellant or applicant. The Board may grant a time extension, if and only if, the Board finds that a good cause appears for the failure to complete within such twelve-month period.