(1) For purposes of the adjustments made in the rent charged in §§ 42-3502.06 and 42-3502.07 [repealed], all substantial violations cited at the time of the last inspection of the housing accommodation by the Department of Buildings before the effective date of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