I. A municipality desiring to adopt the provisions of N.H. Rev. Stat. § 72:81 shall do so in accordance with the procedures set forth in N.H. Rev. Stat. § 72:27-a. The vote shall specify that the exemption, if granted, shall apply to all properties within the municipality if adopted in accordance with N.H. Rev. Stat. § 72:81, II(a) or to a specific group or groups of parcels within the municipality if adopted in accordance with N.H. Rev. Stat. § 72:81, II(b). The vote shall specify the maximum percentage of new assessed value to be exempted, the maximum number of years duration of the exemption following new construction, a definition of public benefit, and a reference to zoning use category definitions, if applicable. The exemption shall take effect in the tax year beginning April 1 following its adoption.
II. A vote adopting N.H. Rev. Stat. § 72:81 shall remain in effect for a maximum of 5 tax years; provided, however, that for any application which has already been granted prior to expiration of such 5 tax year period, the exemption shall continue to apply at the rate and for the duration in effect at the time it was granted.