Love that one.
I think the farthest spots I've seen Toronto's skyline from with the naked eye are at King Rd. coming down the 400, at about 34km from downtown:
https://goo.gl/maps/bP6umtJQ5rw7Nkin6
And across the lake from the QEW, at a distance of 52km:
https://goo.gl/maps/hxGFaCMTsJbVeUKX6
They don't show up well on streetview, but are a bit more visible in real life, at least on a clear day. Unfortunately, being that they're highways I can't really stop for a better shot.