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in 2001, therefore, provides the most accurate and reliable data related to <br />housing capacity and need. <br />The housing needs analysis presents information about residential <br />development by housing types. There are multiple ways that housing <br />types could be grouped. For example, housing types could be grouped by: <br />1. Structure type (e.g., single-family detached, apartments, etc.) <br />2. Tenure (e.g., distinguishing unit type by owner or renter units) <br />3. Housing affordability (e.g., units affordable at given income levels) <br />4. Some combination of these categories <br />For the purposes of this study, we grouped housing types based on: (1) <br />whether the structure is stand-alone or attached to another structure and <br />(2) the number of dwelling units in each structure. The housing types used <br />in this analysis are: <br />• Single-family detached: single-family detached units, secondary <br />dwelling units, and manufactured homes on lots and in mobile <br />home parks. <br />• Single-family attached: row houses, townhouses, and <br />condominiums. <br />• Two to four units: structures with two to four dwelling units, such <br />as duplexes, tri-plexes, and quad-plexes. <br />• Five or more units: structures with five or more dwelling units per <br />structure. <br />The reason for choosing these housing type categories for the analysis is <br />that the City collects data about residential development based on these <br />structure types. <br />Using these structure types to forecast need for new housing does not <br />provide all the information about housing issues that the City may want <br />to consider. In addition, information is not systematically collected on <br />some housing issues, either by the City, the U.S. Census, or other sources <br />that systematically collect and analyze data. Two examples of housing <br />types that stakeholders would like more information on, where <br />information is not readily available, are larger than average student <br />households and affordable small single-family units. These housing types <br />are included as part of the four housing types described above but are not <br />separately identified. <br />One of the key sources for data about housing and household data is the <br />U.S. Census. This report primarily uses data from two Census sources: <br />Part 11 — Eugene Housing Needs Analysis ECONorthwest Page 19 <br />