Historical Postcard of Windsor, Ontario circa 1900

Our friend, Tom Banwell writes,"Do you know on what street in Windsor the Wm. Gray & Sons Co was located? I have an old postcard showing the building. In the same building, apparently, was a business owned by my cousin J.E. Banwell, whose name graces the outside of the same building. I am trying to discover what line of work he was in. Do you know what year the company opened the Windsor plant? The postcard photograph shows horse-drawn carriages only--no automobiles. Thanks for any information you can provide."
To all Enthusiasts, any information that you can provide to Tom and GrayDortMotors.com would be much appreciated.
Yours in motoring, James Gray