Md. Code, Alcoholic Beverages and Cannabis § 23–1602

(a) (1) Subject to subsection (b) of this section, the Board may not issue:

(i) a Class B license for a restaurant that is within 400 feet of the nearest point of a public school building; or

(ii) any other license for an establishment that is within 500 feet of the nearest point of a public school building.

(2) A decision of the County Board of Education to locate a public school building within 500 feet of the premises of a license holder may not be the basis to revoke or deny the renewal or transfer of the license.

(b) For a license issued on or before June 30, 1971, the Board may renew the license or approve the transfer of the license to a new license holder for the same establishment and type of license.