Rales' 150-acre property includes a lake, a guesthouse, and an art museum guarded by off-duty police.

According to Forbes, manufacturing tycoon Mitchell Rales has a net worth of $3.7 billion. He lives in a modernist Potomac house designed by the late Charles Gwathmey,who also worked for Steven Spielberg. The 150-acre property includes a lake, a guesthouse, and an art museum guarded by off-duty police. Rales is cofounder with his brother, Steven, of the manufacturing and technology company Danaher. A National Gallery of Art trustee, Rales owns a collection including Calders, Matisses, and Pollocks, some of which adorn the seven galleries in Glenstone, the zinc-paneled—and tax-exempt—museum on Rales’s property (open by appointment).