In lieu of the imposition of an impound condition a franchiser may post a surety bond in such amount as shall be required by the Commissioner. Such bond shall be issued by a corporate surety admitted to transact business in the State of California, conditioned upon the completion by the franchiser of its obligations under the franchise contract to provide real estate, improvements, equipment, inventory, training or other items included in the offering. Where more than one franchise may at the same time be sold but unopened, the amount of the bond shall equal the aggregate liability to all such franchises in this state.