RSA 447-A:4 Attachment.

The notice of lien under this chapter shall attach to the commercial real estate or any interest in the commercial real estate upon:
I. The principal broker being otherwise entitled to a fee or commission under a written instrument signed by the duly authorized owner, buyer, tenant or his or her respective agent, as applicable; and
II. Except as provided in paragraphs III-VI, the principal broker recording a notice of lien in the registry of deeds of the county in which the real property or any interest in the real property is located, prior to the actual conveyance or transfer of legal title to the commercial real estate against which the principal broker is claiming a lien by the party from which the principal broker claims its fee.
III. Except as provided in par