Which of the following is NOT included in the definition of middle housing in Oregon?

Middle housing in Oregon refers to a category of residential developments that includes more than one housing unit on a single lot, facilitating denser housing options while maintaining compatibility with established neighborhoods. The definition typically encompasses duplexes, triplexes, and quadplexes, which are all multi-family housing types.

Single-family homes, on the other hand, are defined as standalone, detached residences intended for a single family. They do not fall under the category of middle housing because they are not designed to accommodate multiple dwelling units on a single property. Therefore, single-family homes are excluded from the middle housing definition, making this the correct choice.

In contrast, duplexes, triplexes, and quadplexes contribute to the middle housing framework, as they all provide multiple units that can accommodate several households, promoting a diverse housing supply and enhancing community structure within urban areas.