6. Ellison Estate – $200 Million
Those who follow the technology industry probably recognize the name of this property as the one that’s owned by Oracle co-founder and chairman Larry Ellison. Located on 23 acres in Woodside, California, it features a total of ten buildings, a tea house, bath house, koi pond, and a man-made lake. Construction was definitely not rushed during the nine years it took to complete this estate. Ellison was once listed as the third richest man in the United States and owns numerous other properties in the areas around Lake Tahoe and Malibu.