There shall be a general reassessment of real estate every four years or, if determined by majority vote of a county's board of supervisors, every three years. Any county that has a total population of 50,000 or less may elect by majority vote of its board of supervisors to conduct its general reassessments at either five-year or six-year intervals. In addition, Augusta County and Bedford County may elect by majority vote of their respective board of supervisors to conduct their general reassessments at either five-year or six-year intervals.
Nothing in this section shall affect the power of any county to use the annual or biennial assessment method as authorized by law.