ORS § 376.790
After all claims for damages filed pursuant to ORS 376.755(2) have been finally determined, by allowance by the legislative body, by withdrawal, or by a judgment in an action or actions brought pursuant to ORS chapter 35, and the full amount of damages to be paid has accordingly been finally determined, all or part of the total amount of such damages (but not exceeding such part thereof as may be specified in the resolution of intention), together with all costs and expenses incurred in connection with any proceedings or actions taken pursuant to ORS 376.705 to 376.825, may be assessed against the lands within the district and subject to assessment in proportion to the benefits to be derived from the establishment of the pedestrian mall.
ORS 376.790