N.Y. Debt. & Cred. Law § 59
A creditor who has, in his own name, or in trust for him, a mortgage, judgment, or other security, for the payment of a sum of money, which is a lien upon, or otherwise affects, real or personal property belonging to the petitioner, or transferred by him since the lien was created, cannot become a consenting creditor, with respect to the debt so secured, unless he adds to or includes in his consent, a written declaration, under his hand, to the effect, that he relinquishes the mortgage, judgment, or other security, so far as it affects that property, to the trustee to be appointed pursuant to the petition, for the benefit of all the creditors. Such a declaration operates, to that extent, as an assignment to the trustee, of the mortgage, judgment, or other security; and vests in him accordingly all the right and interest of the consenting creditor therein.
N.Y. Debt. and Cred. Law § 59