N.H. Rev. Stat. Ann. § 231:118

If the legislative body of a municipality which has adopted a plan as described shall determine to acquire pursuant to said plan any real property or interest therein, including air rights, necessary for or incidental to the construction, maintenance or operation of public parking facilities, it may proceed to take such real property or interest therein by an exercise of the power of eminent domain in the same manner as provided in this chapter, or it may exercise the power of eminent domain in the manner provided by any other applicable statutory provisions for the exercise thereof.