 Runnymede Collegiate Institute was completed and officially opened on November 11, 1927, although classes had begun on September 6 for 250 students and a staff of 10 teachers led by Principal Bruce W. Clark.The original Collegiate Gothic building was designed by Charles Wellington Smith and consisted of eight classrooms, three science labs, an auditorium, a library, a gymnasium, a cafeteria and a locker area on three floors.Significant additions to the building were completed in 1928, 1958 and 1966.