This mansion at 785 Young Ave was sold Feb 20, 2018 to, as rumor has it, a developer. Should the appeal of the LUB be successful, the mansion will likely be torn down, and the large property divided up into two forty-foot lots.
The House was built for lumber merchant, J. Alfred MacInnes in 1909. According to Viewpoint.ca, It sold for $1,648,000 and was last listed at $1,849,999.
You can read more about this house, and See plans and interior photos at https://yadhcs.wixsite.com/youngavenue/j-alfred-macinnes-mansion
UPDATE March 06 2018: The Buyer is a businessman with a Chinese name. He and his Business partner own a House in Bedford and a Condo on Barrington Street. They do not appear to be developers.