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MARIETTA, GA. — Lockheed Martin has sold four buildings and 52 acres on its south campus in Marietta to the Georgia Institute of Technology. Collocated with five buildings occupied by the Georgia Tech Research Institute, the school will use the additional buildings and land to expand its research and development enterprise. The buildings previously housed the offices and operation of the F-22 Raptor program, which shuttered in 2013. The transaction between Lockheed Martin and Georgia Tech could bring as many as 500 jobs to Cobb County.