Employees at the National Institutes of Health’s National Cancer Institute will be moving into new digs in 2013. The General Services Administration announced Wednesday that it’s awarded a build-to-suit lease for 575,000 square feet of office space for the agency, whose employees now are scattered among five buildings. The JBG Companies of Washington will develop two facilities, connected by a central atrium, at the Shady Grove Life Sciences Center in Montgomery County, Md., for the agency. JBG is leasing land for the project from Johns Hopkins University. The facilities will be built to achieve the second-highest rating from the U.S. Green Building…