(h) Decisions of the Rent Administrator or Office of Administrative Hearings shall be made on the record relating to any petition filed pursuant to this chapter . An appeal from any decision of the Rent Administrator or Office of Administrative Hearings arising under this chapter may be taken by an aggrieved party to the Rental Housing Commission within 30 days after the decision is issued, or the Rental Housing Commission may review a decision on its own initiative. The Rent Administrator or Office of Administrative Hearings shall transmit the complete, official record of the proceeding, including transcripts of any hearings, to the Rental Housing Commission within 30 days of receiving notice that an appeal has been filed. The Rental Housing Commission may reverse, in whole or in part, any decision that it finds to be arbitrary, capricious, an abuse of discretion, not in accordance with the provisions of this chapter , or unsupported by substantial evidence on the record of the proceedings, or it may affirm, in whole or in part, the decision. The Rental Housing Commission shall issue a decision with respect to an appeal within 120 days after the appeal is submitted for consideration.