Ellison styled his estimated $70 million Woodside, California, estate after feudal Japanese architecture, complete with a man-made 2.3-acre (9,300 m2) lake and an extensive seismic retrofit (37°24′44.34″N 122°14′51.40″W). In 2004 and 2005, Ellison purchased more than 12 properties in Malibu, California, worth more than $180 million. The $65 million Ellison spent on five contiguous lots on Malibu’s Carbon Beach was the most costly residential transaction in United States history until Ron Perelman sold his Palm Beach, Florida compound for $70 million later that same year. His entertainment system cost $1 million, and includes a rock concert-sized video projector at one end of a drained swimming pool, using the gaping hole as a giant subwoofer.