Unbelievable California estate gets price dropped by $60 million, no longer comes with 78-year-old man

Before Silicon Valley was ever known as such, there were plenty of billionaires and multi-millionaires building extravagant, hill-top homes.

One such mansion was built by the de Guignés, a family of French nobility who emigrated in the 19th century and enmeshed themselves with San Francisco's elite.

Seventy-eight-year-old heir Christian de Guigné IV is now trying to sell his family's Gilded Age estate - called de Guigné Court - which hasn't changed hands in 150 years. This will be his second attempt at offloading the property, which has been cut from $100 million to $40 million and no longer includes a condition that granted de Guigné "lifelong use" of the home.

Keep scrolling to take a tour of the house and learn more about its strange terms of sale.