Here’s a photo from the July 23 1937 edition of the Toronto Daily Star of a house that was sold at the corner of York Mills Road and Old Yonge Street.
The 1938 Toronto city directory lists Alfred J. Robertson as living on Rural Route 2 in York Mills; this house was far enough away then to qualify as rural. He didn’t live in this house all that long – the 1947 directory lists him at 369 Glengarry Avenue. This directory doesn’t list York Mills, so I don’t know who moved into this house after he left.
The house still stands, at least as of 2009. (In later Google Street View pictures, the house at that address is obscured by trees.)