(Bloomberg News) A surge in wealth from technology stock sales and initial public offerings is spilling into the Silicon Valley real estate market as newly rich workers bid up home values in suburban cities south of San Francisco.

The median price of single-family houses sold in Palo Alto, home of Facebook Inc., climbed 20 percent in May from a year earlier to $1.63 million, the biggest jump since 2008, according to preliminary figures from research company DataQuick. In Mountain View, the base of LinkedIn Corp., prices rose 3.1 percent to $957,500, the ninth year-over-year gain in 12 months.

The advances are defying a U.S. housing slump that has sent national values to an eight-year low. Share sales such as the IPO of LinkedIn -- which doubled on its first day of trading -- and an expected offering from Facebook will fuel a boom in some Silicon Valley cities into 2013, said Kenneth Rosen, an economist at the University of California, Berkeley.

"It's just the beginning of the story and I suspect we'll see an explosion in the next couple years," Rosen, chairman of the school's Fisher Center for Real Estate and Urban Economics, said in a telephone interview. "You've got young people with real money, and it's not surprising they want to have a house."

Almost 300 companies have filed for IPOs in 2011, the most for any year during the same period since 2000, and more than 10 percent of those are in California, according to data compiled by Bloomberg. Silicon Valley is the U.S. hub for early-stage companies, receiving almost 40 percent of the $23.3 billion in venture-firm investments last year, estimates from the National Venture Capital Association show.

Million-Dollar Median

The real estate gains in the valley, located primarily in the San Jose metropolitan area, are mostly occurring in towns where million-dollar values are already the norm. The median price in Cupertino gained 12 percent last month from May 2010 to $1.08 million, and values in Saratoga rose 4.7 percent to $1.62 million, according to San Diego-based DataQuick.

Housing in much of the rest of the nation is struggling as foreclosures and unemployment of more than 9 percent weigh on consumer sentiment. Home prices in 20 U.S. cities dropped 3.6 percent in March from a year earlier to the lowest since 2003, according to the S&P/Case-Shiller index of property values. The measure has declined 33 percent from its 2006 peak.

In Palo Alto, traffic at home showings has tripled in the last three weeks, with the average age of potential buyers dropping from about 50 to the mid-30s, said Daniel Siciliano, an associate dean at Stanford Law School who attends the tours because he's in the market for a bigger house.

Showing Off Wealth

"People at startups have a lot of pent-up demand and tend to spend a portion of their new liquidity pretty quickly," Siciliano said of his newfound competition for residential real estate. "They want to manifest their wealth."

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