Except as provided in subsection (b) of this section, the Board may not issue a license: with an on–sale privilege, for an establishment that is within 500 feet of a school accredited by the State Board of Education; or with an off–sale privilege, for an establishment that is within 1,000 feet of a school accredited by the State Board of Education. The distance from the establishment to the school is to be measured in a direct line from the nearest wall of the establishment to the property line of the school. The prohibition against issuing a license in subsection (a) of this section does not apply to: a Class B (on–sale) beer, wine, and liquor license issued for an establishment located in a municipality in the county; a school that locates its building within 500 feet of an existing licensed premises; or the renewal or transfer of a license issued before May 1, 2014.