93.03 Offices of department, hearings, investigations. The principal office of the department shall be in Madison, but, with the approval of the governor, other offices may be maintained elsewhere in the state as may be necessary for the efficient functioning of the department. Hearings, investigations and meetings necessary to the carrying out of any of the duties of the department may be conducted anywhere within or without the state, as the department determines to be for the best interests of the state and the parties immediately concerned.