(Oregon City, OR) -- The Clackamas County Board of Commissioners has made it easier for property owners to have accessory dwelling units. The zoning code was changed to increase affordable housing. ADU's can be added on rural residential properties larger than two acres if they're outside the urban growth boundary and aren't in an urban reserve. A recreational vehicle can be used as a second dwelling on residential properties inside the urban growth boundary, or if it's outside the UGB and not in an urban reserve.