(1) an abatement was granted to a property that was not entitled to an abatement under this section, or

(2) an abatement was applied or calculated in error under this section. In such event, the amount of the erroneous abatement shall be equal to the difference between the amount of the abatement originally received and the amount to which the property was entitled. b. If the commissioner of finance determines that a property received an erroneous abatement, he or she shall recover such erroneous abatement by deducting the amount of the erroneous abatement from any refund or rebate otherwise payable to the owner, and any balance of the amount of the erroneous abatement remaining unpaid shall constitute a tax lien on the real property, as of the due and payable date provided on the next tax bill mailed by the commissioner of finance containing such amount. If such amount is not paid by such due and payable date, interest at the rate applicable to delinquent real property taxes on such property shall be charged and collected on such amount from the due and payable date provided on such notice to the date of payment. Such tax lien shall be enforceable in accordance with the provisions of law relating to the enforcement of tax liens in any such city. 6. Reduction of assessed value. If the taxable assessed value of a property for the fiscal year beginning on the first of July, two thousand fourteen is reduced after the assessment roll applicable to such fiscal year becomes final, any abatement already granted pursuant to this section shall be adjusted accordingly. The difference between the original abatement and the adjusted abatement shall be deducted from any credit otherwise due. 7. Rulemaking. The commissioner of finance shall be authorized to promulgate rules necessary to effectuate the purposes of this section.