(1) Each city or county that adopts, by resolution or ordinance, ORS 308.450 to 308.481, shall adopt rules specifying the process for determining the boundaries of a distressed area and for distressed area boundary changes.
(2) The cumulative land area within the boundaries of distressed areas within a city or county, whichever adopts the provisions of ORS 308.450 to 308.481, may not exceed 20 percent of the total land area of the city or county.