The only place hotter right now than San Francisco when it comes to residential real estate is Silicon Valley. There you'll find the estate and lands of de Guigne in Hillsborough, which is asking a mind-numbing $100M. The historic Flood Estate in Woodside is on the market for the first time since it was built in 1941, and it's asking $69.8M. There's a neoclassical Georgian style abode with a price tag of $29.88M and a tudor mansion owned by Silicon Valley venture capitalist Kelly Porter. Click through for a map of Silicon Valley's most expensive properties for sale.
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The Most Expensive Properties for Sale in Silicon Valley

Estate and Lands of deGuigne
This sprawling historic estate is asking $100M, and you don't even get to move in if you buy the place. The terms of the sale for the 16,000 square foot main house include letting 75-year-old Christian de Guigne IV, who has a life estate on the property, live out his life in the main house following the sale.
The Historic Flood Estate
The historic Food Estate in Woodside is on the market for the first time since it was built in 1941. It hit the market last year asking $85M, and is now asking $69.8M.
Villa Eirini
Designed by Andrew Skurman and completed in 2009, this neoclassical Georgian style home is asking $29.88M.
Bella Sera
Built in 2002, this 13,558 square foot abode is asking $27.4M and sits on 2.5 acres. Property highlights include a 2BR guest house and "fountains that "surround this beauty."
The Morgan Estate
This Tudor mansion is owned by Silicon Valley venture capitalist Kelly Porter. The 7-bed, 8-bath, 30,000 square foot abode was originally listed for $45M, and is now asking $27M.
Tobin Clark Estate
Built in 1931 by noted architect David Adler, this 12-bed, 13.5-bath, 35,000 square foot mansion is asking $26M. Originally built for Mrs. Cella Tobin Clark, heiress to the Hibernia Bank fortune, the home has hosted Presidents Nixon, Reagan, Ford, and Bush, as well as Prime Minister Margaret Thatcher.
1 Faxon
This 5-bed, 6-bath, 12,840 square foot home's has highlights like a backyard with a pool, putting green, full outdoor kitchen, wet bar, and fire pit. It's asking $25M.
Prime Westridge
Designed by Michael Moyer and built by R.J. Dailey with interiors by Robert Miller, this 3-bed, 4.5-bath, 6,835 square foot home is asking $24.5M. The listing tells us that the wine cellar is "sommelier worthy."
60 Monte Vista
Built in 2007, this is the most contemporary home on the map. The 5-bed, 7.5-bath, 12,765 square foot home features a theater by the Russ Berger Design Group and wine cellar designed by Paul Wyatt. It's asking $16.95M.
7 Faxon Road
Designed and built in 2008 by Pacific Peninsula Group, this 6-bed, 8.5-bath, 11,800 square foot home is asking $15.9M.