Built in 1920, was the second major building in the early history of Saint Mary’s. It houses 93 co-ed sophomores through senior students. The building honors the founder of Saint Mary’s, Bishop Patrick R. Heffron. Rooms are uncarpeted with hardwood floors, beautiful woodwork, have a sink in each room, and are approximately 8.5’ x 13.5’. The hall has two TV lounges, one kitchen, and laundry facilities for student use. The fourth floor of Heffron was renovated in 2002. The second and third were renovated in 2003.