N.H. Rev. Stat. Ann. § 227-D:5-b

In order to establish the tax exempt status of the Monadnock advisory commission established under this chapter, such advisory commission is deemed to be a governmental instrumentality having a distinct legal existence separate from the state and shall not be considered as a department of state government. The exercise by the advisory commission of any authority granted by this section shall be deemed to be the performance of public and essential governmental functions not otherwise fulfilled by state government.