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Facebook is about to finish construction on its 476,000-square-foot data center in Altoona, Iowa. Even before this new facility goes online, though, the company announced today that it plans to build a second data center right next to it.

The company has yet to jump through the usual regulatory hoops to get this project approved, though. Its plans are up for review at the City of Altoona Planning and Zoning Board tomorrow evening and will then have to get approval from the city council in May. Assuming everything goes well, the company will break ground shortly after that.

The new data center will be about the same size of the original building.

According to Facebook’s stats, 460 people were involved in building the first Altoona data center. They logged a total of 435,000 hours.

Iowa has become a popular home for data centers. Google has a large facility there (powered largely by wind power), and Microsoft is planing to build a $1.1 billion facility in West Des Moines, too.

Facebook’s decision was likely impacted by Iowa’s tax climate. The company was awarded $18 million in state tax credits last year according to the Des Moines Register, and as part of its agreement with the city of Altoona, the company won’t have to pay property taxes on the facility for 20 years.

Facebook’s other data centers are located in Prineville, Oregon, Forest City, North Carolina, and Luleå, Sweden.