United Airlines is expanding its network operations facility in Arlington Heights, purchasing an office building that was formerly the home of Motorola’s wireless-network equipment business, reported Crain’s Chicago Business.

United bought the 205,000-square-foot building at 1421 W. Shure Drive to provide more space for its network operations center. Last year, the airline moved out of its headquarters at Willis Tower after flooding knocked out power and caused flight dispatchers to evacuate to a backup facility.

United currently has about 1,500 workers in Arlington Heights, and it continues to hire. The new building offers more space, amenities, and a fitness facility. The move comes as United also plans a remodel and expansion of the airline’s Houston airport terminal.

Northbrook-based Torburn Partners acquired the Arlington Heights building in 2013 in a sale-leaseback with Nokia Siemens, which purchased Motorola’s network-equipment business in 2011 for nearly $1 billion.