The legislature of the state of New Mexico hereby declares that the historical heritage of this state is among its most valued and important assets and that it is the intention of the Historic District and Landmark Act to empower the counties and municipalities of this state with as full and complete powers to preserve, protect and enhance the historic areas and landmarks lying within their respective jurisdictions as it is possible for this legislature to permit under the constitution of the United States and the constitution of New Mexico and subject to the specific duties and responsibilities respecting historical matters already granted or to be granted under other statutes of this state.