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In the summer of 2013 the Oregon DEQ conducted a survey of owners of ADUs in the cities of Portland, Eugene, and Ashland.
The survey methodology and some basic summarized results can be found in this report from the PSU Survey Research Lab.
Further results and interpretation about ADUs in Portland, in terms of commonly discussed issues and questions, can be found in this report by Martin Brown and Jordan Palmeri.
A complete set of the survey responses, from all cities, can be downloaded here.