In 1930, due to increases in student enrollment, the Ursuline Sisters petitioned Bishop Griffin for an expansion of the academy. Bishop Griffin fulfilled their request, and in return the nuns were asked to build a co-ed building. After the transition into a co-educational institution, the school was renamed as St. Teresa High School and Sister Loretto Boland was appointed as the first principal. In 1955, as enrollment further increased, eight classrooms and a gymnasium were built and dedicated to Bishop O'Connor