Oregon Revised Statutes Revenue and Taxation § 308.159

If a lot line adjustment is made with respect to property, the maximum assessed value of the property may be adjusted to reflect the lot line adjustment, but the total maximum assessed value of all property affected by the lot line adjustment may not exceed the total maximum assessed value of the affected property determined under ORS 308.146, or, if applicable, under ORS 308.153 or 308.156.