Leggat McCall Properties said it has completed a 188,000 square-foot addition to Draper Laboratory's Hill Building in Cambridge's Kendall Square.
Headquartered in Boston, Leggat McCall Properties is real estate development, investment, and project management firm.
In addition to housing Draper facilities, the building will be home to anchor tenant Schlumberger, which has relocated its Doll Research Center from Ridgefield, Conn., as well as several other tenants, Leggat McCall said.
According to its website, Schlumberger is an oilfields services provider.
Draper's roots date to the 1930s, its website said, when Charles Stark Draper created a teaching laboratory at the Massachusetts Institute of Technology; in 1973, the lab became an independent, not-for-profit research-and-development corporation.
(By Chris Reidy, Globe staff)