One other known branch includes the Fleeca branch on Vespucci Boulevard, Pillbox Hill.
Originally, the heist itself was to take on three (later stated to be five) Fleeca branches, rather than just the one.The Fleeca Job appears to have been through major changes before its release, as indicated by remaining audio in the DLC files:.
GTA Online Heist 1 - The Fleeca Job (Elite Challenge & Criminal Mastermind) Trivia