We do not know because property values are based on factors that can vary by location. The Washington County Assessment and Taxation Department determines each property’s assessed value. Government agencies determine the tax rate.
We do know, though, that the Oregon Constitution limits the rate of growth of property value subject to taxation. The limit is based on a property's maximum assessed value (MAV). MAV can't increase by more than 3-percent each year, unless there are changes to the property, such as the addition of a new structure, improvement of an existing structure, or subdivision or partition of the property. So if you don’t make any changes to your property, the assessed value should not go up by more than 3 percent a year.