What was the name of Canada's first massive suburb,built on what was then the northern fringe of Toronto?

Name: What was the name of Canada's first massive suburb,built on what was then the northern fringe of Toronto?
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Don Mills was built in the 1950s and was the first planned suburban community in Canada, located on the northern fringe of Toronto. Scarborough, York, and Mississauga are also suburbs, but they were built later and are not the first massive suburb in Canada.

What Was the Name of Canada's First Massive Suburb,built on What