N.Y. Priv. Hous. Fin. Law § 614
An agency may make provision in a note and loan agreement or by separate agreement for the performance of loan or grant servicing functions, including, but not limited to, functions related to lending or providing a grant for construction, as may generally be performed by an institutional lender. Such agency may act in such capacity or appoint or consent to the appointment of a financial institution or other qualified entity, as determined by such agency, to act in such capacity on behalf of such agency. Such agency may pay a reasonable and customary fee to such financial institution or other qualified entity appointed by such agency, or to whose appointment such agency provided consent, for the performance of such loan or grant servicing functions.
N.Y. Priv. Hous. Fin. Law § 614