John F. Kennedy Federal Building

John Fitzgerald Kennedy Federal Building is a United States Federal government office building located in the Government Center area of Boston, Massachusetts, adjacent to City Hall Plaza and diagonally across from Boston City Hall. An example of 1960s modern architecture, and designed by Walter Gropius and The Architects Collaborative with Samuel Glaser, it is a complex that consists of two offset 26-floor towers that sit on-axis to each other and a low rise building of four floors that connects to the two towers through an enclosed glass corridor. The two towers stand at a height of 387 feet . The complex was built in 1963-1966.
The building is bounded by Cambridge, Sudbury, and Congress streets. The building consists of twin 26-story high-rise towers, which sit on axis to each other, and a low, 4-story building. This combination of tall towers paired with low buildings is a common Modern form that is used extensively throughout the United States and abroad. The double towers increase the number of offices lit by natural light and decrease the visual bulk that a single monolithic building would create. The building contains 839,000 square feet .

Wikipedia