Larry Ellison, founder of Oracle, has purchased Porcupine Creek, a 249-acre private golf estate. Porcupine Creek was originally listed for $75 million but was reduced to $55 million earlier this year. The estate features an 18,430 square foot main residence and eight two-bedroom guest-houses. One of the estates most talked-about features is its 18-hole golf course, tucked into the base of the Santa Rosa Mountains. In '09 Ellison purchased the Indian Wells Tennis Garden and its world-class BNP Paribas Open tennis tournament.