Taxes change when the land use changes, improvements are made or property is sold. You can read more about assessment and taxation at the Multnomah County Assessment and Taxation website. You can also contact the Multnomah County Taxation and Assessment Customer Service line at 503-988-3326 (leave a message and they will call you back).
Curbside Hotline: 503-823-7202
1900 SW 4th Ave, Suite 7100, Portland, OR 97201