Sococo, the virtual office startup that launched its service at DEMO Fall 2010, has raised $4.2 million in equity funding from undisclosed investors, according to a filing with the SEC.

The company’s first service, called Team Space, allows coworkers to communicate using spatially-aware avatars. Within the space, workers can enter virtual offices and instantly conduct meetings with video, voice and screen shares. Individual users typically have their own offices for private communications, and conference rooms are reserved for larger meetings.

Sococo currently has more than 10,000 users in over 58 countries ranging from small software startups to teams within big name companies like Yahoo. Eight to ten person teams are most common, said CEO and co-founder David Van Wie, although Sococo can accommodate teams with up to 32 offices.

A basic project studio with two private offices and one conference room is free. Extra virtual square feet start at $15.99 per month.

The company plans to use the latest funding to focus on sales and marketing of Team Space, but Van Wie hinted that additional services may be in the works. Though Sococo is primarily focused on the professional environment today, the same technology could be applied to a social application next.

Based in San Francisco, Sococo, originally called Social Communications Company, was founded in 2007 by the co-founder of InterTrust Technologies, a developer of digital rights management (DRM) software, and a former Yahoo employee. The funding round remains open.