In this section, “appeal authority” includes: a supervisor; the Department; a property tax assessment appeal board; the Maryland Tax Court; and any other court authorized to hear property tax appeals under this subtitle. In hearing an appeal under this subtitle that relates to the value of real property, an appeal authority may consider the following criteria in making its final decision: the fair market value of the real property; the valuation and assessment methodology employed by the assessor; depreciation factors; or any other criteria related to the valuation and assessment of real property. Within 10 days after a decision by an appeal authority that reduces the value of commercial real property by more than 20%, the appeal authority shall notify the governing body of the county and municipal corporation in which the property is located of the decision. Notwithstanding any other provisions of this subtitle, within 90 days after receiving notice from the appeal authority under paragraph (1) of this subsection, the governing body of the county or municipal corporation may appeal to the appropriate appeal authority. Subject to paragraph (2) of this subsection, within 30 days after the Department provides notice to a tax collector to whom property tax was paid that an appeal authority has issued a decision that reduces the assessed value of property, the tax collector shall pay to the taxpayer a full refund of the excess tax paid. The notice required under paragraph (1) of this subsection shall include a list of all properties for which an appeal authority has calculated that a taxpayer is due a refund as a result of a decision by the appeal authority to reduce the assessed value of the property.