Tower Square is a 29-story commercial office building located in Springfield, Massachusetts. With a height of 371 feet (113 m), Tower Square is the second tallest building in both Springfield, and in Massachusetts outside of Boston. The building has approximately 300,000 square feet (28,000 m2). The building was developed by Mass Mutual. Constructed in 1970 by Pietro Belluschi; it was designed in the international style.