Requiring the governing body of Baltimore County to grant a certain property tax credit to supplement the State homeowners property tax credit; prohibiting the county from granting the credit if the homeowner's combined net worth is in excess of $200,000 or the homeowner's combined gross income exceeds $72,000; providing that the State Department of Assessments and Taxation is responsible for certain administrative duties with respect to the credit; and requiring the county to reimburse the Department for certain costs.