O'Neill House Office Building
The Thomas P. O'Neill Jr. House Office Building was constructed in the early 1960s for use as Food and Drug Administration laboratories. It is one of the few federal buildings completed during the presidency of John F. Kennedy and the cornerstone bears his name as a result. Legislation transferred ownership of the facility from the General Services Administration to the U.S. House of Representatives in June 2017.
Full details on the O'Neill Building are at aoc.gov/house/oneill.