744 Duplex Avenue
Snider House was built in 1828, and is the oldest surviving building in North Toronto. It's set back so far from the street, you'd miss it if you weren't looking.
It's a gorgeous building, and I find it hard to imagine what life must have been like here, almost 200 years ago
Here's a photo from 95 years ago, via Toronto Public Library. You can almost feel the farmland just behind the photographer.
Snider House (red H at top left in this diagram from Lost Rivers) was situated at the headwaters of Walmsley Brook. It was the only building in the area, reached by a laneway from Yonge St.
There are some interesting details of its history in this real estate story when it was put up for sale in 2015 (asking $4million, taxes $26000/yr).
It really does have an impressive lot. Note that 80 by 203 ft = 16240 sq ft, which is 0.37 acres, or less than ¼ of 1% of the original 210 acre grant. This map is a screenshot from Toronto Maps v2.
Given the opportunity, I would live here in a heartbeat. Want a look inside? You will drool.