New York Laws
Article 3 - Jurisdiction and Service, Appearance and Choice of Court
R322 - Authority for Appearance of Attorney in Real Property Action.

(b) Authority of non-resident defendant's attorney. The attorney for a
non-resident defendant in an action affecting real property shall file
with the clerk written authority for his appearance, executed and
acknowledged in the form required to entitle a deed to be recorded, and
shall serve either a copy of such authority or notice of such filing on
the plaintiff's attorney within twenty days after appearing or making a
motion.
(c) Agencies or wholly-owned corporations of the United States. This
rule does not apply to an attorney representing an official, agency or
instrumentality of, or corporation wholly owned by, the United States.

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