General Electric will build its new Boston headquarters on land along Fort Point Channel in South Boston that GE bought from Procter & Gamble Co.

GE announced Thursday it will make its headquarters on Necco Street in Fort Point, across the channel from the U.S. Post Office. GE bought 2.5 acres of land, and 5 and 6 Necco Way, from P&G, land and buildings that were formerly owned by Gillette until that company was bought by P&G in 2005.

The new GE campus, where GE expects about 800 people to work, will consist of new construction and the two existing historic buildings, which the company plans to renovate, GE said. Of those 800 people, 200 are product managers, designers and developers working in software, robotics, energy and life sciences.  

GE expects the move to its new HQ to start this summer, and to be completed by 2018. Its employees will work out of temporary offices on nearby Farnsworth Street in Fort Point.

“South Boston is a major hub for innovation and development and GE is excited to be a part of such a dynamic and creative ecosystem that is leading the future,” GE Vice President Ann Klee said in a statement. “This centrally-located property presents an excellent opportunity to enhance the Seaport District and the surrounding community. We look forward to bringing our headquarters to South Boston.”