 After making the Old Main Building of the University of Scranton its temporary home for two years, Prep moved to its permanent location, the former Women’s Institute Building of the International Correspondence Schools, at 1000 Wyoming Avenue.Although founded as a boys' school, Scranton Prep became co-educational in 1971 when a fire destroyed Marywood Seminary, a local girls’ academy conducted by the Immaculate Heart of Mary Sisters.Although the Prep's staff and operation were for the most part distinct from the university, it was owned by the university and under its corporate control from 1944 until 1977, when it received its official charter of separate incorporation in 1977.