Under the leadership of Mother Olympias Gleeson, the school flourished. Recognizing the school’s need for additional space, John J. Raskob purchased the Grant Estate, facing Delaware Avenue, and gifted it to the Ursuline Sisters. With the addition of Kennett Lodge, renovations began, and the sisters and their students moved into their new convent and school in 1924. After the purchase of the Downward Estate, an adjacent property bordering on Franklin Street, further renovations were completed in 1927, ushering in a new year for Ursuline’s 300 students. In 1955, under the leadership of Mother Maguire, the junior school was constructed in response to the demands of a student body that numbered more than 500. The Montessori program was added in 1964, and the Laffey-McHugh Gymnasium was added in 1980. In 2017, construction began to renovate the former Ursuline convent into a new, multi-functional space with classrooms, chapel, library, cafeteria, atrium, Innovation Center, and more. The Anthony N. Fusco Sr. Student Life Center was officially opened in January 2019.