Property taxes in California are at most 1% of the assessed value. If your property immediately doubled in value, you'd have to be in it 200 years before being

Property taxes in California are at most 1% of the assessed value. If your property immediately doubled in value, you'd have to be in it 200 years before being underwater on it from taxes. If we let that debt accrue interest the timeline becomes much shorter, of course, but presumably the property appreciates at a related interest rate.