Subject to subsection (b) of this section, a performance evaluation conducted by the Office shall be made at the offices of the State unit, county officer or unit, corporation, association, or local school system that is subject to examination. If considered appropriate and after consultation with the unit or body being examined, the Director may authorize all or a portion of a performance evaluation to be conducted at the offices of the Office. Before the Office removes the original or only copy of any record from the premises of a State unit, county unit, or a school system, the Office shall obtain the approval of the State unit, county unit, or the school system.