 The sections of the original building such as the commercial and technical wing was erected in 1963, followed by the addition of 11 classrooms along with the swimming pool built in 1964 and the library in 1974.During the 1980s, Midland experienced declining enrollment due to demographic changes in the Toronto area.The school body had also undergone a demographic shift from an influx of new immigration to the nearby area since the early 1990s.