HILLSBOROUGH, CA — In regards to premier real estate locations in the San Francisco Bay Area, Hillsborough is at the top of the list. Mansions here sell for large fortunes, and one in particular mansion is currently for sale for $100 million. According to the San Mateo County Times, the mansion’s owner, Christian de Guigne IV, has lived in the home his whole life. Now 76 years of age, Guigne has decided to sell his family’s home, under certain conditions.

The 16,000 square-foot mansion, a Mediterranean-style home, that sits on 45 acres in the ritzy neighborhood comes with one condition, the buyer can move in only after Guigne’s death. As strange as this arrangement may sound to those living today, it was a common property arrangement up until the modern 20th century. According to Greg Lynn, an agent with Sotheby’s International Realty, the property is a “Once-in-a-life-time opportunity” said Lynn.

The population of this exclusive city was at 10,825, according to the 2010 census. The Hillsborough town is dominated by huge luxury homes, and the city has enforced a minimum 2,500 square-foot home size as well as a minimum lot size of 0.5 acres, for many years. This was done to keep the town exclusive. In fact, there are no condominiums or apartments to obstruct the beautiful view of the town for Guigne mansion’s new owner.