There's 5 tower's under construction in this image, though one of them is just out of frame, but the crane peeks in to the left edge.
Starting from the left, we have 2 condo towers (Untitled Toronto) going up, followed by the topped out rental building at 100 Broadway, then the rental addition to 75 Broadway, and a twin condo project going up right next door.
Dilliusionment, Insubstantiality by
Josh Kennington Photographics, on Flickr
Altogether, this is 5 of 8 buildings going up along this street at the moment.
The first two projects I mentioned are here as well
They Rise by
Josh Kennington Photographics, on Flickr