It has been posted as a proposed Toronto building on Skyscrapercity for quite some time at that height, i think the other phases are also posted, i dont know how accurate that information is but they seem to be pretty good on posting correct project heights. Should be close considering this 44 storey mixed-use tower development has 10 storeys of office.
Oh i just found this PDF,
http://www.toronto.ca/legdocs/mmis/2007/ny/bgrd/backgroundfile-453.pdf actually it states that the north tower is proposed for 177 meters.