B. In all cases brought before the board, there shall be a presumption that the valuation determined by the assessor is correct. The burden of proof on appeal to the board shall be on the taxpayer to rebut the presumption and show by a preponderance of the evidence that the property in question is valued at more than its fair market value or that the assessment is not uniform in its application and that it was not arrived at in accordance with generally accepted appraisal practices, procedures, rules, and standards as prescribed by nationally recognized professional appraisal organizations such as the International Association of Assessing Officers (IAAO) and applicable Virginia law relating to valuation of property. Mistakes of fact, including computation, that affect the assessment shall be deemed not to be in accordance with generally accepted appraisal practice. However, in any appeal of the assessment of residential property filed by a taxpayer as an owner of real property containing less than four residential units, the assessing officer shall give the required written notice to the taxpayer, or his duly authorized representative, under subsection E of § 58.1-3331, and, upon written request, shall provide the taxpayer or his duly authorized representative copies of the assessment records set out in subsections A, B, and C of § 58.1-3331 pertaining to the assessing officer's determination of fair market value of the property under appeal. The assessing officer shall provide such records within 15 days of a written request by the taxpayer or his duly authorized representative. If the assessing officer fails to do so, the assessing officer shall present the following into evidence prior to the presentation of evidence by the taxpayer at the hearing:
(i) copies of the assessment records maintained by the assessing officer under § 58.1-3331,(ii) testimony that explains the methodologies employed by the assessing officer to determine the assessed value of the property, and(iii) testimony that states that the assessed value was arrived at in accordance with generally accepted appraisal practices, procedures, rules, and standards as prescribed by nationally recognized professional appraisal organizations such as the International Association of Assessing Officers (IAAO) and applicable Virginia law regarding the valuation of property. Upon the conclusion of the presentation of the evidence of the assessing officer, the taxpayer shall have the burden of proof by a preponderance of the evidence to rebut such evidence presented by the assessing officer as otherwise provided in this section.