On the east bank of Lake Washington, across the water from Seattle, is Medina, a town of about 3,000 people that has become a home for tech billionaires. Among them are Bill Gates, the founder of Microsoft, and Jeff Bezos.
At Medina Beach park, teenagers chat at picnic tables and dive into the lake from a bobbing pontoon dock. Jet skis and pleasure boats skim across the glistening water as seaplanes buzz overhead. A small army of gardeners, tree surgeons and swimming pool cleaners drift between the lakefront mansions on Evergreen Point Road.