Pleasanton is about 29 miles north of Saratoga.
Proposition 13 reduced Cupertino homeowners’ average property-tax bills by more than $29,000 in 2025, according to an analysis of Redfin data. The gap between average market and assessed values there grew to $1.5 million in 2025, up from $1.2 million in 2017. The 2026 tax roll was unavailable.
The pattern differed elsewhere. In San Francisco, the average reduction was about $9,000. Redfin put the city’s typical home value near $1.6 million, compared with an average taxable assessment slightly above $1 million.
The market value was about 52% higher in 2025, versus more than twice the assessment in 2017. The analysis said the gap may have grown in 2026 as home values rose, but available tax-roll data did not determine by how much.
Proposition 13, approved by California voters in 1978, generally sets property taxes using a home’s purchase value and voter-approved local rate increases. The taxable value can increase by no more than 2% each year and is reassessed after a sale.