ORS § 366.330
The Department of Transportation may, when acquiring real property for right of way purposes, acquire additional real property adjoining the real property sought to be acquired for the particular public project if such additional and adjoining real property is needed for the purpose of moving and establishing thereon buildings or other structures then established on real property required for right of way purposes. The acquisition of the abutting, additional real property may be accomplished by purchase, agreement, donation or exercise of the power of eminent domain. Such real property can be acquired only in the event that the owner of the real property required for right of way purposes and on which there is then located buildings or other structures, has entered into a written agreement with the department providing for and consenting to the removal and reestablishment of the buildings or structures on the additional, abutting real property.
ORS 366.330