The old School House at 807 New North Road, pictured below, was built in 1844 as a gentleman’s residence. MAGS' first Headmaster, F.W. Gamble, persuaded the School's Board to buy it from the Child Welfare Department, which had run it as a home for destitute children but had built new accommodations elsewhere. The School House opened in 1927 with 22 boys.

It grew, and remained on that 2.5ha site until 1970, when the existing School House was built on what was a hockey field at MAGS. The old building was demolished and a fragment of open space remains as the Alice Wylie Reserve.