Image of Downtown Pleasanton. About Property Assessment Property Tax System Click Here Calendar & Important Dates Click Here Glossary Click Here Proposition 13 Click Here Supplemental Assessment Click Here Decline in Market Value Click Here Why Assessed Value May Increase More Than 2% Click Here Property Ownership Information Click Here Change in Ownership Reappraisal Click Here New Construction Reappraisal Click Here Manufactured Homes Click Here Business Personal Property Click Here Possessory Interests Click Here Assessment Appeals Click Here The Property Tax System Calendar & Important Dates Glossary 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