The Planning Board may reverse or affirm, in whole or in part, or may modify the action, order, requirement, decision, interpretation or determination appealed from, and to that end have all the powers of the Zoning Enforcement Officer from whom the appeal is taken.

An appeal to the Planning Board shall stay all proceedings in furtherance of the action in respect to which the decision appealed from was made unless the Zoning Enforcement Officer from whose action the appeal is taken certifies to the Planning Board, after the notice of appeal shall have been filed with him, that, by reason of facts stated in the certificate, a stay would, in his opinion, cause imminent peril to life or property. In such case, proceedings shall not be stayed other than by an order of the Superior Court upon notice to the officer from whom the appeal is taken and on due cause shown.

Any variance from the terms of this chapter hereafter granted by the Planning Board permitting the erection or alteration of any structure or structures or permitting a specified use of any premises shall expire by limitation unless such construction or alteration shall have been actually commenced on each and every structure permitted by said variance or unless such permitted use has actually been commenced within one year from the date of publication of the notice of the judgment or determination of the Planning Board; except, however, that the running of the period of limitation herein provided shall be tolled from the date of filing an appeal from the decision of the Planning Board to the governing body or to a court of competent jurisdiction until the termination in any manner of such appeal or proceeding.