Table 6 and Figure 3 show type of dwelling by tenure (owner/renter- <br />occupied) in Eugene in 2011. The results show that single-family detached <br />housing types have a much higher ownership rate than other housing <br />types- 72% of owner-occupied units were single-family detached. <br />Multi-family housing types were predominately renter occupied. More <br />than 95% of structures with two or more units were renter-occupied. <br />Seventy-five percent of single-family attached dwellings were renter <br />occupied and 28% of single-family detached units were renter occupied. <br />Table 6. Housing units by type and tenure, Eugene, 2011 <br />Owner Occupied <br />Renter Occupied <br />All Dwellings <br />Housing type <br />Number <br />Percent <br />Number <br />Percent <br />Number <br />Percent <br />Single-family detached <br />27,652 <br />72% <br />10,603 <br />28% <br />38,255 <br />58% <br />Single-family attached <br />1,201 <br />25% <br />3,550 <br />75% <br />4,751 <br />7% <br />Two to four units <br />329 <br />5% <br />6,932 <br />95% <br />7,261 <br />11% <br />Five or more units <br />469 <br />3% <br />15,390 <br />97% <br />15,859 <br />24% <br />Total <br />29,651 <br />36,475 <br />66,126 <br />100% <br />Source: American Community Survey 2011 625032 <br />Note: Single-family detached includes manufactured homes. <br />Note: The number of dwelling units in Eugene shown in Table 2, Table 4, and Table 5 differ because the tables show different <br />information. Table 3 shows all units, Table 4 shows occupied units, and Table 6 shows occupied units where housing type is known. <br />2.4 Density <br />Housing density is the density of housing by structure type, expressed in <br />dwelling units per net or gross acre.6 <br />The U.S. Census does not track residential development density. This <br />study analyzes housing density based on development between 2001 and <br />2012 because changes to the City's zoning code went into effect in 2001 <br />that affect housing development. <br />Table 7 shows average net residential development by structure type for <br />the 2001 to 2012 period using address point and tax lot data. Table 7 <br />shows that the City added 7,971 neu, dwelling units during the 2001 to <br />2012 period. The tax lots with these new dwelling units had 2,351 pre- <br />existing dwelling units (e.g., units built before 2001). The average density <br />6 OAR 660-024-0010(6) uses the following definition of net buildable acre. "Net Buildable Acre" <br />consists of 43,560 square feet of residentially designated buildable land after excluding future <br />rights-of-way for streets and roads. While the administrative rule does not include a definition of a <br />gross buildable acre, using the definition above, a gross buildable acre will include areas used for <br />rights-of-way for streets and roads. Areas used for rights-of-way are considered unbuildable. <br />Part 11 - Eugene Housing Needs Analysis ECONorthwest Page 27 <br />