((a)) Full-time United States magistrate judges serving under this chapter shall be allowed their actual and necessary expenses incurred in the performance of their duties, including the compensation of such legal assistants as the Judicial Conference, on the basis of the recommendations of the judicial councils of the circuits, considers necessary, and the compensation of necessary clerical and secretarial assistance. Such expenses and compensation shall be determined and paid by the Director under such regulations as the Director shall prescribe with the approval of the conference. The Administrator of General Services shall provide such magistrate judges with necessary courtrooms, office space, furniture and facilities within United States courthouses or office buildings owned or occupied by departments or agencies of the United States, or should suitable courtroom and office space not be available within any such courthouse or office building, the Administrator of General Services, at the request of the Director, shall procure and pay for suitable courtroom and office space, furniture and facilities for such magistrate judge in another building, but only if such request has been approved as necessary by the judicial council of the appropriate circuit.

((b)) Under such regulations as the Director shall prescribe with the approval of the conference, the Director shall reimburse part-time magistrate judges for actual expenses necessarily incurred by them in the performance of their duties under this chapter. Such reimbursement may be made, at rates not exceeding those prescribed by such regulations, for expenses incurred by such part-time magistrate judges for clerical and secretarial assistance, stationery, telephone and other communications services, travel, and such other expenses as may be determined to be necessary for the proper performance of the duties of such officers: , That no reimbursement shall be made for all or any portion of the expense incurred by such part-time magistrate judges for the procurement of office space.