ORS 98.810: Unauthorized parking of vehicle on proscribed property prohibited.

A person may not, without the permission of:

      (1) The owner of a parking facility, leave or park any vehicle on the parking facility if there is a sign displayed in plain view at the parking facility prohibiting or restricting public parking on the parking facility.

      (2) The owner of proscribed property, leave or park any vehicle on the proscribed property whether or not there is a sign prohibiting or restricting parking on the proscribed property.