ORS § 223.455
In cases where a sale was made under the original final assessment or any previous reassessment, with reference to such local improvement, and the property was not redeemed from the sale, the purchaser at the sale is subrogated to the rights of the local government with reference to the property upon such reassessment if the purchaser waives all penalties and interest, except such interest as may be provided for on the reassessment, and delivers up for cancellation any certificate or other evidence of the sale. If a deed was issued at the sale, the grantee therein, or the heirs, executors, administrators, successors or assigns of the grantee, shall execute a deed of release and quitclaim of all right, title and interest in the property under such sale to the owner of the property and deliver the deed to the recorder, so that the owner's title may be cleared of the sale. The recorder shall act as escrow holder of such certificate or other evidence of sale and of such deed pending completion of reassessment. If the reassessment is not completed, the recorder shall return the certificate or other evidence of sale and the deed to the person delivering it to the recorder. If the reassessment is completed, the certificate or other evidence of sale shall be canceled and placed on file in the office of the recorder and the deed shall be delivered to the owner of the property specified therein. If any such purchaser, or the heirs, executors, administrators, successors or assigns of such purchaser fails to comply with this section, that person is not entitled to subrogation. In any event, the amount of subrogation shall not exceed the amount that has been paid to the local government on such sale, together with interest at the rate of six percent per annum from the date of sale until the date of payment. This amount is to be paid by the local government to the purchaser, or the heirs, executors, administrators, successors or assigns of the purchaser if and when the local government collects the amount of the reassessment against the property.
ORS 223.455