#5. Larry Ellison – Woodside, California
Oracle executive chairman Larry Ellison has an extensive real estate portfolio. He has bought up large parts of whole neighborhoods in Malibu and around Lake Tahoe. He owns a $70-million Beechwood Mansion in Newport, Rhode Island; a garden villa in Kyoto, Japan; and 98% of the land of Lanai, Hawaii’s sixth-largest island, which he purchased in 2012 for $500 million. His estate in Woodside, California, with an estimated value of $110 million, is modeled after 16th-century Japanese architecture, complete with a man-made 2.3-acre lake.