the maximum adjusted rent for purposes of computing rent increases pursuant to Section 151.06 of this chapter. (Amended by Ord. No. 156,597, Eff. 5/20/82, Oper. 5/15/82.) 4. Limitation on Rent Adjustment. (Added by Ord. No. 154,808, Eff. 2/13/81.) a. (Amended by Ord. No. 156,597, Eff. 5/20/82, Oper. 5/15/82.) For every rental unit which experiences a rent increase based on capital improvement and/or rehabilitation work begun prior to June 1, 1982 and also approved by the Department after February 13, 1981: The Department shall mail a notice to the landlord of the rental unit indicating that the Department will issue a written order to the landlord requiring the termination of the rent increase after the cost of the work has been fully recovered, unless it determines that the rental unit became eligible for a rent increase pursuant to Section 151.06 C. or that a reduction in rent would work an undue hardship on the landlord. b. An application for relief from the proposed order may be made within 30 days after the mailing of the notice in accordance with such procedures as the Commission may establish. c. For any rental unit for which a capital improvement rent adjustment was granted by the Department between February 13, 1981 and May 31, 1982, and for which a hardship exemption was granted pursuant to Section 151.07 A.4.a., said capital improvement rent adjustment shall terminate upon the effective date of this amendment. The landlord shall, within ten days of the effective date of this amendment, serve a written notice of termination of the capital improvement rent adjustment to all affected tenants setting forth the amount of increase which is to be terminated. (Added by Ord. No. 163,832, Eff. 8/25/88.) 5. The Department in accordance with such guidelines as the Commission may establish, shall have the authority to grant certificates of exemptions for luxury housing accommodations and substantial renovation work In processing an application for exemption, the Department shall afford both landlords and tenants notice and an opportunity to be heard prior to the issuance of a certificate of exemption. An application for a certificate of exemption shall be accompanied by a $25.00 filing fee. After August 31, 1982, no unit shall be exempt pursuant to Sections 151.02 M.7. or M.8. without first obtaining a certificate of exemption.