Taiwanese cell phone maker HTC, which has been adding employees at a brisk pace since opening an office in Durham earlier this year, will soon be taking more office space in American Tobacco Campus.

The company is expanding by 31,266 square feet in ATC's Crowe and Foweler buildings.

With the expansion, HTC's total square footage will reach 47,000.

Heath Chapman and Don Shupe of CB Richard Ellis' Raleigh office represented HTC in the deal. The two also represented Health IT Services Group, which recently signed a lease for 43,500 square feet of space in ATC.

HTC now employes about 60 people in Durham and has job openings for a dozen more on its website.

The office focuses on long-term research projects.

HTC initially took 15,000 square feet of space in ATC with an option to occupy more as it grew.