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c. Multiply the suitable area within each tier by the floor area ratio to yield total floor area for each tier allowed to be used for dwelling units or sites. D. Divide the total floor area by tiér computed in Item C. above by the average inside living area size determined in Item A. above. This yields a base number of dwelling units and sites for each tier. E. Proposed locations and numbers of dwelling units or sites for the commercial planned unit development are then compared with the tier, density and sui tabili ty analyses herein and the design criteria in section 8.6. 8.53 Density Increase Multipliers: A. Increases to the dwelling unit or dwelling site base densities previûusly determined aL~ allowable if the dimensional standards in Section 5.0 are met or exceeded and the design criteria in Section 8.6 are satisfied. The allowable density increases in Item B. below will only be allowed if structure setbacks from the ordinary high water level are increased to at least 50 percent greater than the minimum setback, or the impact on the waterbody is reduced an equivalent amount through vegetative management, topography, or additional means acceptable to the local unit of government and the setback is at least 25 percent greater than the minimum setback. B. Allowable Dwelling Unit or Dwelling site Density Increases for Residential or Commercial Planned Unit Developments: üëhSity evaluation .L...! .....___ 1,;..L~L·þ Maximum density increase within each tier (percent) First Second Third Fourth Fifth 50 100 200 200 200 8.6 Maintenance and Design criteria 8.61 Maintenance and Administration Requirements. A. Before final approval of a planned unit development, adequate provisions must be developed for preservation and maintenance in perpetuity of open spaces and for the continued existence and functioning of the development. B. Open space preservation. Deed restrictions, covenants, permanent easements, publ ic dedication and· acceptance, or other equally effective and permanent means must be provided to ensure long-term preservation and maintenance of open space. The instruments must include all of the following protections: (1) commercial uses prohibited (for residential PUD's): (2) vegetation and topographic alterations other than routine maintenance prohibited; L)r-.