As of June 2024, the United States had 7.43 million millionaires, which is a 7.3% increase from 2023. This number represents 6.6% of the country's population, and is more than any other country in the world.
$2.5 million is the median house in Sunnyvale. So you're going to need a little more. I'd say in Santa Clara County you will need at least $5-7.5 million.