(2) Where the Rent Administrator finds there have been excessive and prolonged violations of the housing regulations affecting the health, safety, and security of the tenants or the habitability of the housing accommodation in which the tenants reside and that the housing provider has failed to correct the violations, the Rent Administrator may roll back the rents for the affected rental units to an amount which shall not be less than the September 1, 1983, base rent for the rental units until the violations have been abated.
(b) A housing accommodation and each of the rental units in the housing accommodation shall be considered to be in substantial compliance with the housing regulations if:
(1) For purposes of the adjustments made in the rent charged in §§ 42-3502.06 and 42-3502.07 [repealed], all substantial violations cited at the time of the last inspection of the housing accommodation by the Department of Buildings before the effective date of the increase were abated within a 45-day period following the issuance of the citations or that time granted by the Department of Buildings, and the Department of Buildings has certified the abatement, or the housing provider or the tenant has certified the abatement and has presented evidence to substantiate the certification. No certification of abatement shall establish compliance with the housing regulations unless the tenants have been given a 10-day notice and an opportunity to contest the certification; and