SAN FRANCISCO -- For years, as they've jockeyed for tech jobs and the cachet that comes with them, San Francisco has touted its cosmopolitan allure, while San Jose has countered with its vast supply of land.

Now, in an effort to add a weapon to his city's arsenal, San Francisco Mayor Ed Lee has proposed reshaping a 30-acre stretch of freeway and rail yards into high-density housing, shops, restaurants and more than 2 million square feet of high-rise office space.

But rather than a new stage in a Bay Area arms race, Lee's plans are being hailed as a sign of a new, cooperative sentiment sweeping the region. "Mayor Lee wants to see how to promote the Bay Area," said his spokeswoman, Chrisine Falvey. "There will be widespread benefits if companies relocate or expand to San Francisco, San Jose, Oakland or nearby areas."

Cars enter onto Interstate 280 southbound from King Street on Thursday, Feb. 28, 2013 in San Francisco, Calif.  The stakes in the economic tug-of-war
Cars enter onto Interstate 280 southbound from King Street on Thursday, Feb. 28, 2013 in San Francisco, Calif. The stakes in the economic tug-of-war between the South Bay and San Francisco get higher with a massive plan by San Francisco to demolish a stretch of I-280 as a way to transform part of its east side waterfront into a new hub for tech and biotech and green energy firms. (Aric Crabb/Staff) ( ARIC CRABB )

Added San Jose Mayor Chuck Reed, whose city long has billed itself as Silicon Valley's capital: "I'm worried about Texas," not San Francisco. "We've got much bigger competition for companies that are expanding to other states and countries instead of keeping their growth in Silicon Valley."

Enrico Moretti, a professor of economics at UC Berkeley who has studied the region's history of innovation, said traditional rivalries have yielded to the reality of a fast-shifting business landscape.

"It used to be the case that tech companies were either in the South Bay or San Francisco. Now they are in both locations," he said. "And workers are much more mobile."


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At the same time, Moretti said, Lee's proposal to knock down Interstate 280 north of 16th Street and relocate a Caltrain storage yard near AT&T Park is an aggressive move for the business-friendly mayor, who has worked to keep startups in town as they grow.

Lee already has cut tax deals with such startups as Twitter in exchange for help revitalizing rundown areas, and he persuaded city voters in the fall to eliminate a payroll tax the mayor and others insisted punished companies for growth.

"Knocking down the 280 extension makes a lot of sense," Moretti said. "It will free up a lot of land to attract companies and create jobs."

Lee, in fact, said razing the overpass and rail yard is the city's last, best hope to create the kind of corporate campuses that San Jose and other cities long have used to woo companies that have outgrown San Francisco's South of Market area. The neighborhood is home to companies such as Zynga and Yelp and also includes the Mission Bay area, where city officials have already targeted expansion zones for tech firms.

But some say the area already is so filled up there's little room for growth.

The Caltrain rail yard at 4th and King Street is photographed on Thursday, Feb. 28, 2013 in San Francisco, Calif.  The stakes in the economic tug-of-war
The Caltrain rail yard at 4th and King Street is photographed on Thursday, Feb. 28, 2013 in San Francisco, Calif. The stakes in the economic tug-of-war between the South Bay and San Francisco get higher with a massive plan by San Francisco to demolish a stretch of I-280 as a way to transform part of its east side waterfront into a new hub for tech and biotech and green energy firms. (Aric Crabb/Staff) ( ARIC CRABB )

"When you go to lunch in SoMa, you have to get out of the office before noon or you're going to be standing in line," said Jason Johnson, co-founder of startup accelerator Founders Den, which sits near the Caltrain yard in Lee's sights and offers startups shared office space and other resources.

"At certain times, companies have to leave because of their size, or because of tax incentives elsewhere," Johnson said. "San Francisco has lost a lot of companies over the years."

To be sure, Lee's plan won't give San Francisco anywhere near the amount of office space San Jose boasts. The 30 acres the mayor thinks can be freed up is about the size of a single corporate campus on San Jose's North First Street. And Reed and other San Jose officials are making plans of their own to add millions of square feet to that area, accommodating as many as 20,000 new jobs.

Rather than view Lee's plan as a possible threat, Reed sees it as another piece of the region's real estate portfolio.

"It's important that we have options in the Bay Area," Reed said. "North San Jose's got one kind of development potential. We've got Coyote Valley with another kind of development potential. We're trying to provide lots of different kinds of environments for companies to work in. Those that want to be in a San Francisco high-rise will choose that."

Lee's proposal isn't without its sharp critics. Some commuters worry it will slow traffic in and out of the city.

Caltrain officials, too, say they need the rail yard to house trains, especially with plans afoot to electrify the line as part of the state's high-speed rail project. The city is paying for Caltrain to conduct an eight-month study weighing the plan's potential impacts, according to Santa Clara County Supervisor Ken Yeager, who heads the Peninsula Corridor Joint Powers Board that owns and operates the commuter line.

Still, Yeager acknowledged, despite Caltrain's concerns, Lee's plan "would be a tremendous boon" for San Francisco and the rest of the region.

Ultimately, economic forces that are far stronger than the ambitions of the mayors of San Jose and San Francisco are likely to carry the day, said UC Berkeley's Moretti, who wrote the 2012 book "The New Geography of Jobs."

"The labor markets in the Bay Area are getting increasingly integrated," Moretti said. "This is very good for the region, very good for high tech and very good for the Bay Area economy."

Contact George Avalos at 408-373-3556 or 925-977-8477. Follow him at Twitter.com/george_avalos. Contact Peter Delevett at 408-271-3638. Follow him at Twitter.com/mercwiretap.

To learn more
The San Francisco Planning Department's study of how the Caltrain yard and Interstate 280 extension could be redeveloped is at http://bit.ly/15Z83iJ.