When reviewing applications for approval of subdivision plats, site plans or conditional uses, to grant, to the same extent and subject to the same restrictions as the Zoning Board of Adjustment:

Whenever relief is requested pursuant to this subsection, notice of a hearing on the application for development shall include reference to the request for a variance or direction for issuance of a permit as the case may be.

Expiration of variance. Any variance 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 been actually commenced on each and every structure permitted by said variance, or unless such development has actually been commenced within 18 months 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 a court of competent jurisdiction, until the termination in any manner of such appeal or proceeding. The Planning Board may, for good cause, extend the time period for a period not to exceed six months. In no case shall the Board grant more than two such extensions. Where subdivision or site plan approval is required, the period of time for commencement of the development specified by the Planning Board shall be the same as the period of time for which other rights are conferred upon the applicant by such subdivision or site plan approval pursuant to the provisions of this chapter.