A.
Certificate required and building permit required. It shall be unlawful for any person, firm or corporation to construct, alter, remove or demolish any improvement or structure which is a landmark, part of a landmark site or which is located in an historic district when such action will affect the exterior of such property without having first obtained a certificate of appropriateness or a certificate of no effect or a certificate of exception authorizing such work.
B.
Building permit required, but no certificate required. Building permit applications for construction, alteration, removal or demolition involving any improvement or structure which is a landmark, part of a landmark site or which is located in an historic district when such action will not affect the exterior of such property do not require a certificate of appropriateness, a certificate of no effect, a certificate of exception or Board review. In such instances, the Department of Public Works shall stamp the building permit "Please note that an additional permit is required if exterior work is undertaken."
C.
Certificate required, but no building permit required. In a case where no building permit is required, application for permission to construct, alter, remove or demolish landmarks, improvements on landmark sites or structures within historic districts shall be made directly to the Preservation Board.