N.Y. Comp. Codes R. & Regs. tit. 3, § 410.5
(a) A mortgage broker or mortgage banker may apply to open and maintain one or more branches. A branch may be applied for by application containing the information and documents set forth in a form which may be obtained from the department, at the address set forth in section 1.1 of Supervisory Policy G 1 of this Title. If an application is requested in writing, the address should indicate the following: Attn: Mortgage Banking Division.