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CUMULATIVE DESIGN RESULTS The following tables indicate 1) the totals generated by this design exercise, and 2) a "sensitivity analysis" to see what other alternatives would yield. Under the staff design, approximately 32 % of the area would be preserved as permanent open space (not including private open space preserved in five -acre lot developments). A total of 1,391 lots would be created at a gross density of one lot per 1.3 acres. If the urban developments in sites B, O, and P are added in, the total number of lots rises to 1,769 lots on 1,936 acres. In comparison with the previous alternatives presented by the UNC students, the number of lots generated in this design is higher than the two -acre conventional and density - neutral alternatives. There are three important distinctions in this design process that explain a great deal of the difference in lot yields. First, the previous alternatives did not plan urban -scale development in the Transition Area sites. The Rural Character strategies do not apply in these areas, and they are targeted for urban services and urban -scale development. Therefore, this Rural Character design develops these areas at just over two lots per acre. Second, the previous alternatives assume that 15% of the buildable land is taken "off the _ top" as an infrastructure assumption, yielding a considerably smaller amount of land available for residential use. A number of actual site designs over the years in the Rural Character Study have indicated that the percentage of land needed for infrastructure in these options is considerably lower, on the order of 6% to 8%. The infrastructure multiplier for this design was computed on a case - by -case basis, ranging from 6% to 10%. There are no planned new roads that would increase this percentage, and most easements for utilities could be incorporated in the open space without additional infrastructure acreage needs. Finally, the site -by -site design analysis resulted in the selection of a higher ratio of open -space developments. Since the choice of development style is that of the property owner, it is likely that the area will develop with a different "mix" of development options, which could substantially alter the total number of lots and open space created. A second table follows the site design table which shows the potential lot yield under each of the Rural Character development options, ranging from 380 lots under the 5 -acre lot option to 2,507 lots under the 1/4 -acre OSD. 19