The purposes of this section are to: protect the historical, archaeological, architectural, or cultural heritage areas in Montgomery County and Prince George’s County that comprise the regional district; and preserve and enhance the quality of life in the community. In addition to the power to regulate planning, zoning, or subdivision, a district council may adopt local laws to protect, preserve, and enhance, as designated on the adopted and approved general plan: sites; structures and their appurtenances and environmental settings; and districts of historical, archaeological, architectural, or cultural value. The enactment and application of a local law under this section shall be: reasonable and appropriate to the purpose of this subtitle; and limited to the protection, preservation, and enhancement of the exterior of the site, structure, or district. If the enactment or application of a local law by the district council effects a taking of private property, the district council shall make provision for just compensation.