The landlord shall not increase the rent for any rental unit included in REAP during such time as the rental unit or units remain in the REAP program, except that, for a rental unit which is voluntarily vacated by all of the tenants after all of the deficiencies noted in the citation or order have been corrected, the landlord may increase the rent to any amount upon rerental of the rental unit. The board shall promulgate regulations setting forth what constitutes a voluntary vacation of the rental unit. (Prior code § 49.14.1410)