(1) If two or more property tax accounts are merged into a single account, or if property that is attributable to one account is changed to another account, the maximum assessed value of the property may be adjusted to reflect the merger or change, but the total maximum assessed value for all affected accounts may not exceed the total maximum assessed value the accounts would have had under ORS 308.146 or 308.149 to 308.166 if the merger or change had not occurred.
(2) If a single property tax account is divided into two or more accounts, the maximum assessed value of all property affected by the division may not exceed the total maximum assessed value of the affected property determined under ORS 308.146 or 308.149 to 308.166.