N.H. Rev. Stat. Ann. § 356-C:8

No owner or his agent acting alone or with other persons shall attempt to circumvent or circumvent the protections given tenants under RSA 356-C:6; nor shall any such person willfully cause a tenant to vacate the dwelling unit or to be evicted from the unit without good cause in contemplation of conversion before the issuance of the notices required by RSA 356-C:3, I or II. Nothing in this chapter shall make it unlawful for a landlord to evict a tenant at any time for one of the grounds set forth in RSA 356-C:6.