Within 30 days of the final adjournment of a public hearing, called and held under Subsection A of this section, the Zoning Board of Appeals shall grant, grant with conditions, or deny the variance applied for. The decision of the Board shall be in writing and shall contain each of the findings specified in § 200-65 of this chapter, and the factual basis for each finding from the record of hearing, which shall support the decision of the Board. The Board shall notify the Adirondack Park Agency, by certified mail, of such decision. Any variance granted or granted with conditions shall not be effective until 30 days after such notice to the Agency. If, within such thirty-day period, the Agency determines that such variance involves the provisions of the land use and development plan as approved in the local land use program, including any shoreline restriction, and was not based upon the appropriate statutory basis of practical difficulties or unnecessary hardships, the Agency may reverse the local determination to grant the variance.