Donald Bren – Net Worth: $17 Billion – Undisclosed, Newport Beach

Donald Bren, the chairman of Irvine Company, has made a billionaire out of himself by being one of the most prolific real estate developers of our time. According to Business Insider, his business holds over 110 million square feet of property, including 500 office buildings, 130 residence areas, 41 retail hubs, five marinas, three hotels, and three golf clubs. Oddly enough, the real estate mogul, currently worth $17 billion, has not shared much about his own home. Reports say that Bren lives on Newport Beach’s Harbor Island with his third wife, Brigitte, and their son. The area is a private waterfront neighborhood composed of multimillion-dollar houses.