(a) The Rent Administrator shall consider adjustments allowed by §§ 42-3502.10 , 42-3502.11 , 42-3502.12 , 42-3502.13 , and 42-3502.14 or a challenge to a § 42-3502.06 adjustment, upon a petition filed by the housing provider or tenant. The petition shall be filed with the Rent Administrator on a form provided by the Rent Administrator containing the information the Rent Administrator or the Rental Housing Commission may require. The Rent Administrator shall issue a decision and an order approving or denying, in whole or in part, each petition within 120 days after the petition is filed with the Rent Administrator. The time may be extended only by written agreement between the housing provider and tenant of the rental unit.