Historical preservation districts, hereinafter designated as HP districts, are established to further preservation of historical resources in the county by encouraging development within the district which makes their preservation economically and physically viable and by restricting development inconsistent with or inimical to their historical nature. Regulation of uses within the district is intended to be compatible with the historical nature of the resource and with the district. Regulation may extend to structural or other alteration, including painting, of structures within the district to maintain compatibility with historical values, and any other regulations which may be necessary to properly preserve the historical resource. (Prior gen. code § 8-35.0)