In Frummer v. Hilton Hotels Intl., (19 NY2d 533, 227 NE2d 851, 281 NYS2d 41 [1967]), the Court of Appeals found Hilton Hotels (U.K.) Ltd., a British corporation, to be doing business in New York because the activities of the Hilton Reservation Service, a separate but commonly owned company with offices in New York, made the latter an agent for the former. The court found that common ownership supported an inference of an agency relationship. (Id. at 538.) The court further found--"and this is the significant and pivotal factor--the [Hilton Reservation] Service does all the business which [Hilton Hotels (U.K.) Ltd.] could do were it here by its own officials." (Id. at 537.)