100 Summer Street is a high-rise building located in downtown Boston, Massachusetts. The building stands at 450 feet (140 m) with 33 floors, over 1.03 million square feet (over 92,000 m2) of office space, and was completed in 1974. It is ranked 24th on the list of tallest buildings in Boston. The building is notable for the distinctive bronze tint of its windows. It was designed in a U-shaped footprint to accommodate a small public plaza. Welton Becket and Associates was the architect. In 1998, EQ Office acquired the building.