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ECLA: Baseline Assumptions ECONorthwest July 2009 Page 22 <br />Housing density <br />Housing density is the density of housing by structure type, expressed in dwelling <br />units per net or gross acre. Like housing mix, State law requires determination of <br />12 <br />housing density based on analysis of data and suggests using analysis of housing <br />density developed over the past five years or since the most recent periodic review, <br />whichever time period is greater, or for a shorter or longer time period. <br />The U.S. Census does not track residential development density. City staff <br />recommends using housing density based on development between 2001 and 2008 <br />(rather than 1999 to 2008) because changes to the City’s zoning code went into effect in <br />2001 that affect housing development. Eugene City staff concluded that data prior to <br />1996 is not accurate and consistent enough for an analysis of longer-term housing <br />densities. <br />Table 6 shows average net residential development by structure type for the 2001 to <br />2008 period. The average density for all residential development over the 2001 to 2008 <br />period was 6.7 dwellings per net acre. Average residential densities ranged from 5.6 <br />dwelling units per net acre for single-family residential to 26.3 for apartments with 20 or <br />more units. These estimates are in the typical range and consistent with previous work <br />by ECONorthwest and others for other cities in Oregon. Tables B-1 and B-2 in Appendix <br />B show average density by plan designation and zoning district. <br />Table 6. 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 /> <br /> OAR 660-024-0010(6) uses the following definition of net buildable acre. “Net Buildable Acre” consists of 43,560 <br />12 <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 />