Twitter Opens Sunnyvale Office

Twitter is expanding out of San Francisco after all.

The micro-blogging Web site -- which recently moved into Market Street office space in San Francisco following a tax break from the city -- has leased space for a satellite office in Sunnyvale, according to real estate agents.

Twitter has agreed to lease 8,000 square feet of space in downtown Sunnyvale near Caltrain, Colliers International told the Oakland Tribune.

"It's good to see some movement from San Francisco to Silicon Valley," Colliers broker Kevin Moul told the newspaper.

Between 40 to 50 employees will toil for Twitter at the new location, according to an estimate. Representatives from the company did not comment to the newspaper. It's also not certain when the company will make the move -- "interior improvements" are currently underway.

Twitter joins Apple and Google as Silicon Valley tech firms opening up office space in Sunnyvale.