Rev. & Tax. Code, § 25107

(a) For the purposes of allocation and apportionment of income under Sections 25101 and 25121, an international banking facility maintained by a bank within California shall be considered doing business without the state. Intangible personal property and sales reflected on the segregated books and records recognized by the Board of Governors of the Federal Reserve System as attributable to the international banking facility shall be attributed to that international banking facility in determining the property, payroll, and sales factors of the bank.

(b) As used in this section, “bank” means a commercial bank, the principal office of which is located in this state and which is incorporated and doing business under the laws of the United States or of this state, a United States branch or agency of a foreign bank, an Edge corporation organized under Section 25 (a) of the Federal Reserve Act, 12 United States Code 611-631, or an Agreement corporation having an agreement or undertaking with the Board of Governors of the Federal Reserve System under Section 25 of the Federal Reserve Act, 12 United States Code 601-604 (a).