I do not know the Actual address but I have a 40" long Factory Lithograph of a Canadian Plant that looks to be from the era. I bought it with a 28 Canadian Roadster.
Ford Canada assembly plants location identification codes
F for Ford City - Ford Canada's main plant Walkerville Ontario
M for Montreal, Quebec
T for Toronto, Ontario
W for Winnipeg, Manitoba
V for Vancouver, British Columbia
Listed in the 1931 Canadian Model A manual is also the sales offices. This one used to be an assembly plant earlier.... 680 Waterloo St, London, ON N6A 3V8