judging by Cassius' first pic they probably have something to do with mounting points for the precast finish. The precast has not yet reached the full height of the building...
The detail in the brick and balcony glass is really impressive, unfortunately my photo isn't. Perhaps I need to capture it in the morning when the sun is shining on the building...
Tewder... you just picked a fight with one of my favourite buildings in this area. Grrr. The old Sick Kids Hospital is indeed gorgeous, and I even quite enjoy the PoMo addition.