Md. Code, Land Use § 8-104

(a) The legislative body of each local jurisdiction, by local law, may regulate: (1) the construction, reconstruction, alteration, moving, and demolition of sites or structures of historical, archaeological, or architectural significance; (2) the construction, reconstruction, alteration, moving, and demolition of sites and structures within districts; and (3) the appurtenances and environmental settings of sites and structures within the limits of the local jurisdiction. (b) The purpose of a local law adopted under this section is to: (1) safeguard the heritage of the local jurisdiction by preserving sites, structures, or districts that reflect elements of cultural, social, economic, political, archaeological, or architectural history; (2) stabilize and improve the property values of those sites, structures, or districts; (3) foster civic beauty; (4) strengthen the local economy; and (5) promote the preservation and appreciation of those sites, structures, and districts for the education and welfare of the residents of each local jurisdiction.