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ECLA: Baseline Assumptions ECONorthwest July 2009 Page 23 <br />? <br />Potential range of assumption: Table 6 shows the most recently data available <br /> <br />about housing density in Eugene. <br />OAR 660-007 requires that cities of 50,000 or more people in the Metro UGB <br />assume that new residential construction will be average at least 10 dwelling <br />units per net acre. Although OAR 660-007 does not apply to Eugene (because <br />the City is not in the Portland Metro UGB), this rule does illustrate the housing <br />density that cities in the Metro UGB are expected to achieve. <br />? <br />CAC and TAC discussion: CAC and TAC made no suggestions for alternative <br /> <br />housing density assumptions. <br />? <br />Current technical recommendation for baseline assumption: We recommend <br /> <br />using Eugene’s current housing density in the baseline analysis. Assumptions <br />about future housing density may be revised based on direction from the City <br />Council. <br />? <br />Data source: 2001 to 2008 housing mix: The assumption about housing density <br /> <br />is based on development trends over the 2001 to 2008 period, based on LCOG <br />GIS data and City of Eugene Planning Department’s building permit data. <br />Converting net acres to gross acres <br />The existing data about residential density is in acres, which does not include land <br />net <br />for public right-of-way. One way to estimate the amount of land needed for housing <br />including public right-of-way is to convert from to acres based on assumptions <br />netgross <br />about the amount of land needed for right-of-way. <br />13 <br />? <br />Potential range of assumption: The net-to-gross factor for housing built <br /> <br />between 2001 and 2008 in Eugene averaged about 20%, based on analysis of <br />residential development that occurred in Eugene between 2001 and 2008. <br />? <br />CAC and TAC discussion: CAC and TAC did not provide comments on the <br /> <br />net-to-gross factor. <br />? <br />Current technical recommendation for baseline assumption: We recommend <br /> <br />using a net-to-gross factor of 20%. <br />? <br />Data source: The net to gross factor is a point in time estimate based on LCOG <br /> <br />GIS data and City of Eugene Planning Department’s building permit data. <br /> <br /> <br /> OAR 660-024-0010(6) uses the following definition of net buildable acre. “Net Buildable Acre” consists of 43,560 <br />13 <br />square feet of residentially designated buildable land after excluding future rights-of-way for streets and roads. <br />While the administrative rule does not include a definition of a gross buildable acre, using the definition above, a <br />gross buildable acre will include areas used for rights-of-way for streets and roads. Areas used for rights-of-way are <br />considered unbuildable. <br /> <br /> <br />