Overall, U.S. home prices registered their biggest annual climb since summer 2006, rising 8.1 percent compared with last year, according to the SP/Case-Shiller composite index. Every one of the 20 major metropolitan areas Case-Shiller tracks posted year-over-year gains. The annual gains accelerated in 19 of the markets, with Detroit the only exception.

“The number that jumps off the page is San Francisco’s 17.5 percent increase in the past 12 months,” David Blitzer, chairman of the index committee for SP Dow Jones Indices, said. “That’s pretty big. Only one city, Phoenix (with a 23.2 percent increase), did better. Compared to the low points, you’re way up there, about 25 percent over the low. It’s a strong comeback.”

Resale homes

Case-Shiller defines the San Francisco metro area as Alameda, Contra Costa, Marin, San Francisco and San Mateo counties. The index tracks sales of the same single-family houses over time, comparing changes with a base value of 100, which represents values as of January 2000.

The San Francisco index is now 147.45, meaning that prices are 47.45 percent above their January 2000 level. The region’s index peaked at 218.37 in May 2006 and hit a low of 117.74 in March 2009 – so prices are still 32.5 percent below their peak, according to the index.

Several forces propel the upward trend, notably an improving economy, low interest rates, tight inventory and fewer foreclosures.

The San Francisco area “is the second-leading place in the country in job creation (after Houston), and doesn’t build a lot of houses, so supply is very tight,” said Ken Rosen, chairman of the Fisher Center for Real Estate and Urban Economics at UC Berkeley. “We added 210,000 jobs to the Bay Area in the past 2 1/2 years – that’s a lot of people.”

Similar forces are driving the rental market, which is also experiencing big price run-ups. Exacerbating that situation, the tight for-sale inventory “is forcing a lot of people who want to be buyers to remain as renters,” Rosen said.

Rosen and others said Case-Shiller actually understates the turnaround – prices have risen even more than the index can capture. In part, that’s because it has a long lag time, measuring prices in January. Real estate service DataQuick, for instance, reported that February median sales prices in the nine-county Bay Area were up 24.6 percent compared with the same time in 2012.

“I would say Case-Shiller under-represents,” said Charmaine Frank, Redfin real estate’s area manager for San Francisco, San Mateo, Santa Clara and Marin counties. “The market has taken a pretty dramatic turn since January.”

Cash is the fuel

Like agents throughout the Bay Area, she said there are “enormous bidding wars going on. We see upwards of 40 to 60 offers on some properties; typically the top five to eight will be all-cash buyers.”

The numerous cash sales help fuel price appreciation, she said, because buyers skip getting an appraisal since they don’t have a mortgage. Appraisals, which rely on recent comparable sales, would moderate the rapid run-up.

“There’s a huge shortage of homes on the market right now,” said Cindi Hagley, a broker with the Hagley Group at Prudential California Realty in San Ramon. “For example, there are only 12 single-family homes for sale in Dublin right now. Ordinarily there should be 100 to 150 homes for sale there.”

Patrick Newport, U.S. economist with market analyst Global Insight, said that the rising home prices should help boost the economy further. “They stimulate new construction, and they also help consumer spending because they raise the value of people’s homes,” he said.

With multiple bids and properties selling well above asking price, could another real estate bubble be forming?

“Not yet,” said Rosen. “If they keep (interest) rates this low for two more years, the answer is yes.”

“This time, rapidly rising prices are a good thing,” Newport said. “A lot of homeowners are underwater; this helps them come out of that.”

Carolyn Said is a San Francisco Chronicle staff writer. E-mail: csaid@sfchronicle.com Twitter: @csaid

Article source: http://www.sfgate.com/business/article/Home-prices-in-Bay-Area-up-17-5-in-January-4386974.php