N.H. Rev. Stat. Ann. § 195-A:9

Upon the date of operating responsibility of an area school, the school buildings of the various sending districts and receiving district which formerly served the same grades as the area school and have been rendered surplus thereby under the approved plan, shall automatically be deemed closed and discontinued notwithstanding the provisions of RSA 194:35 or any other applicable statute, unless the school district in which any such building is located shall have expressly voted to devote the same to some different educational use.