New York Laws
Article 3 - Relations of Partners to Persons Dealing With the Partnership.
27 - Partner by Estoppel.

(a) When a partnership liability results, he is liable as though he
were an actual member of the partnership.
(b) When no partnership liability results, he is liable jointly with
the other persons, if any, so consenting to the contract or
representation as to incur liability, otherwise separately.
2. When a person has been thus represented to be a partner in an
existing partnership, or with one or more persons not actual partners,
he is an agent of the persons consenting to such representation to bind
them to the same extent and in the same manner as though he were a
partner in fact, with respect to persons who rely upon the
representation. Where all the members of the existing partnership
consent to the representation, a partnership act or obligation results;
but in all other cases it is the joint act or obligation of the person
acting and the persons consenting to the representation.

Structure New York Laws