<p style="text-align:start;" size="1" _root="[object Object]" __ownerid="undefined" __hash="undefined" __altered="false">Based in Jacksonville, Dream Finders designs and builds customizable homes at a typical price of $360,000, mostly in Florida, but also in Colorado, Washington, D.C., the Carolinas and elsewhere. Helped along by America’s superheated residential market, the company went public in January, and its stock doubled from its IPO price. That has made Patrick Zalupski—who is just 40 years old and owns about two-thirds of its shares—a billionaire, worth more than $1.5 billion most recently.</p>