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2. Open Space Requirements. Planned unit developments <br />must contain open space meeting all of the <br />following criteria: <br />a) At least fifty (50) percent of the total <br />project area within the Shoreland District <br />must be preserved as open space; <br />b) Dwelling units or sites, road rights -of -way, <br />or land covered by road surfaces, parking <br />areas, or structures, except water- oriented <br />accessory structures or facilities, are <br />developed areas and shall not be included in <br />the computation of minimum open space; <br />c) Open space must include areas with physical <br />characteristics unsuitable for development in <br />their natural state, and areas containing <br />significant historic sites or unplatted <br />cemeteries; <br />d) Open space may include outdoor recreational <br />facilities for use by owners of dwelling units <br />or sites, by guests staying in commercial <br />dwelling units or sites, and by the general <br />public; <br />e) Open space may include subsurface sewage <br />treatment systems if the use of the space is <br />restricted to avoid adverse impacts on the <br />systems; <br />f) Open space must not include commercial <br />facilities or uses, but may contain water - <br />oriented accessory structures or facilities; <br />The appearance of open space areas, including <br />topography, vegetation, and allowable uses, <br />must be preserved by use of restrictive deed <br />covenants, permanent easements, public <br />dedication and acceptance, or other equally <br />effective and permanent means; and <br />h) The shore impact zone, based on normal <br />structure setbacks, must be included as open <br />space. For residential PUDs, at least fifty <br />(50) percent of the shore impact zone area of <br />existing developments or at least seventy (70) <br />percent of the shore impact zone area of new <br />developments must be preserved in its natural <br />existing state. For commercial PUDs, at least <br />g) <br />46 <br />Page 73 <br />