N.Y. Real Property Law § 421: Powers of attorney to be filed and registered

§ 421. Powers of attorney to be filed and registered. Before any

person can convey, charge, incumber or otherwise deal with any

registered property, or any estate, right or interest therein, as

attorney in fact for another, the deed or instrument empowering him so

to act shall be filed with the registrar and a memorial thereof shall be

entered upon the certificate in the title book, in like manner as in the

case of a charge or incumbrance. A revocation of such power of attorney

may be registered in like manner as such power of attorney was

registered.