Oregon Revised Statutes Revenue and Taxation § 307.664

Each qualified dwelling unit of single-unit housing that qualifies for exemption under ORS 307.651 to 307.687 shall be exempt from ad valorem taxation for no more than 10 successive tax years beginning July 1 of the first tax year following approval of the application under ORS 307.674, as determined under rules adopted by the Department of Revenue. The exemption provided by this section shall be in addition to any other exemption provided by law for the property. However, the amount of assessed value exempted under this section may not exceed the real market value of the structure determined as of the date that the property is inspected for purposes of making a determination under ORS 307.674.