In 1958, the School separated and the high school of grades 9 to 12 moved from the East Second Street location, which would continue to house what was to be called "St. John's Elementary School" to the newly purchased Prospect Hall, a large mansion constructed on old "Red Hill" southwest of town off of Jefferson Pike and the new Butterfly Lane, built 1787-1803 and most recently owned by a former U.S. Representative (Congressman) Joseph H. Himes, (also source for the renamed nearby road segment and postal address of Himes Avenue). An additional temporary building was constructed at the rear of the mansion providing additional classrooms, an auditorium and gymnasium.