Commission activities include: Establishing or removing Historic Landmark and Conservation Landmark designations for specific buildings or sites; Recommending the establishment, amendment, or removal of Historic Landmark and Conservation Landmark designations to the City Council; Providing advice on the establishment, amendment, or removal of Historic Districts and Conservation Districts to the Planning and Sustainability Commission and the City Council; Recommending design guidelines for Historic Districts and Conservation Districts to the City Council; Reviewing development proposals for Historic Landmarks and Conservation Landmarks and in Historic Districts and Conservation Districts; Reviewing demolition and relocation requests for certain landmarks and buildings in Historic and Conservation Districts; Providing advice on historic preservation matters to the Hearings Officer, Design Commission, Planning and Sustainability Commission, Prosper Portland Board of Commissioners, other City commissions and committees, and City Council; and. At least three of the additional members must have professional experience or working knowledge of historic preservation, local history, architectural history, architecture, landscape architecture, real estate, economics, construction, community development, urban planning, archeology, law, finance, cultural geography, cultural anthropology, cultural resources management, or related disciplines.