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Recommendations for Baseline Assumptions ECONorthwest April 2009 Page 15 <br />Table 4. Average development density by structure type, dwelling units per net <br />acre, 2001-2008, Eugene UGB <br />Tri- and <br />Single-Single-Quad-plex Apts with Apts with <br />family Manufact-family (3 or 4 5 to 19 20 or more <br />Yeardetachedured homeDuplexattachedunits)unitsunitsTotal <br />20015.84.18.631.29.44.8na5.8 <br />20025.78.011.810.75.312.5na6.3 <br />20035.32.41.815.36.319.5na4.7 <br />20045.36.48.85.410.218.412.56.7 <br />20055.42.911.233.714.732.327.76.5 <br />20065.83.59.922.35.27.647.97.9 <br />20076.19.28.218.518.468.347.410.0 <br />20085.77.84.69.214.529.382.18.8 <br />Average5.63.96.820.27.813.126.36.7 <br /> <br />Source: LCOG GIS data and City of Eugene Planning Department, 2008 <br />? <br />Potential range of assumption: Table 4 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. <br />? <br />CAC and TAC discussion: We are working with the CAC and TAC about <br /> <br />assumptions about housing density. <br />? <br />Current technical recommendation for baseline assumption: We are working <br /> <br />with the CAC, TAC, and DLCD to develop a recommended baseline <br />assumption about housing density. <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 />? <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 /> <br />