Image of Downtown Pleasanton.

About Property Assessment

Property Tax System

Calendar & Important Dates


Proposition 13

Supplemental Assessment

Decline in Market Value

Why Assessed Value May Increase More Than 2%

Property Ownership Information

Change in Ownership Reappraisal

New Construction Reappraisal

Manufactured Homes

Business Personal Property

Possessory Interests

Assessment Appeals

Attention!A Message About The Canyon Fire & Disaster Relief

Dear Alameda County Residents:

If your property has been affected by the recent Canyon Fire in the Sunol, Pleasanton, or Niles-Fremont region, please click here for the Application for Reassessment of Damaged or Destroyed Property and more information on Disaster Relief.

If you have any questions about the application or disaster relief, please call our office at (510) 272-3787. Alternatively, you can email us at


The Alameda County Assessor’s Office