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Facebook's Seattle office.
Facebook’s Seattle office.

Facebook appears to have already outgrown its office space in Seattle.

The social networking powerhouse, which just two years ago expanded into new offices at the Metropolitan Park towers in Seattle, is eyeing even more space.

A real estate source tells GeekWire that the company is on the prowl for about 80,000 to 90,000 square feet in downtown Seattle, eyeing the top two floors of the Macy’s building. That’s enough room for about 500 workers.

Representatives for Facebook were not immediately available for comment. The company is represented by Dan Foster of Flinn Ferguson who was not reachable.

The company’s offices in Seattle have swelled in recent months to about 400 employees, and Mark Zuckerberg and crew wants to keep growing here as it looks to tap even more engineers and coders.

Two years ago, Facebook employed about 90 people in Seattle. It is one of a number of large Silicon Valley tech companies with growing operations in the region, joining companies such as eBay, Google, and Twitter that also have engineering centers here.

Engineers in the Facebook Seattle office work on a wide variety of projects and technologies, including the company’s mobile apps, its advertising systems, video calling and instant messaging.

Separately, The Puget Sound Business Journal reported today that Facebook is looking for 100,000 square feet of space in Seattle.

Founded 10 years ago, Facebook employed 6,818 people at the end of March.

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