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Eugene needed housing density and mix ECONorthwest Page <br />preferences; (2) the community’s preferences for both accommodating growth within <br />the UGB and for protecting the quality and characteristics of existing neighborhoods; <br />and (3) the requirements of Goal 10 for the City to show that it can achieve the needed <br />density and mix. <br />6 <br />Given these considerations, what is the reasonable upper bound on housing density <br />and mix? We address this question in more detail below: <br />Would it be reasonable for the City to plan for a 100% increase in density, from <br /> <br />an average of 7.3 dwellings per net acre to an average of 14.6 dwellings per net <br />acre? That would require a change in mix to about 40% single-family detached <br />and 60% multifamily housing types, with densities for all types of units <br />increasing by 50% or more. <br />7 <br />Would it be reasonable for the City to plan for a 50% increase in density, from <br /> <br />an average of 7.3 dwellings per net acre to an average of 10.9 dwellings per net <br />acre? That would require a change in mix to about 45% single-family detached <br />and 65% multifamily housing types, with densities for all types of units <br />increasing by about 30% or more. <br />8 <br />These assumptions do not seem reasonable because there is no precedence for these <br />magnitudesof change in a suburban city of Eugene’s size in Oregon. In addition, these <br />housing types are in the upward bounds of housing density developed in Eugene over <br />the last decade and representative of housing demand for a portion of the market but <br />not a broad range of the market. By comparison, Portland Metro sets density targets for <br />cities within the Metro Urban Growth Boundary. For larger cities, the target is 10 <br />dwelling units per net acre and a 50/50 housing mix split. Eugene would need to <br />establish a robust policy framework like Metro’s to achieve an average density of 10 <br />dwelling units per net acre. <br />In our opinion, a reasonable upper bound of the increase in overall housing density <br />over the next 20 years would be on the order of 25% to 30%. A 30% increase in overall <br /> <br /> Those limits result from the requirement that the city provide evidence that demonstrates that it can achieve the <br />6 <br />needed density and mix. In short, as the density and mix deviates more from the actual observed results, the higher <br />the burden of proof that policy initiatives will result in the needed density and mix. <br /> For example, single-family detached units would have a density of 8.6 du/net acre and structures with five more <br />7 <br />units would have a density of 39.7 du/net acre. The average gross lot size for all units would be 2,980 square feet and <br />5,056 square feet for single-family units. <br /> For example, single-family detached units would have a density of 6.8 du/net acre and structures with five more <br />8 <br />units would have a density of 31.3 du/net acre. The average gross lot size for all units would be 3,981 square feet and <br />6,406 square feet for single-family units. <br />PC AIS, p14 <br />