Oregon Revised Statutes Revenue and Taxation § 311.165

(1) If in the opinion of the assessor:

(2) If the amount of the taxes for the current year attributable to the property improvements is not able to be determined, the assessor shall estimate the taxes due for the current year. The assessor shall make demand upon the owner of the improvements as shown by the most recent assessment roll, for payment of the unpaid taxes attributable to the improvements for the current and all prior years. Any payments shall be paid immediately upon demand of the assessor either to the assessor for remittance to the tax collector or directly to the tax collector of the county pursuant to ORS 311.370. If the taxes are not paid immediately upon demand, the assessor shall certify the assessment and tax levies so made by the assessor to the tax collector. For the purposes of collection of the assessments, the owner shall be considered a taxpayer owning personal property against which ad valorem taxes have been assessed. Review may be had as provided in ORS 311.467. All taxes collected by the tax collector, or taxes collected by the assessor and remitted to the tax collector shall be credited to the real property account containing the improvements which were the basis of the tax.