There are few right angles on properties in Toronto. It's quite possible that as the property moves north away from Queen Street that it angles ever so slightly, and that the wall north of the balconies had to move in a bit to take that into account. These kind of construction decisions rarely happen by mistake.
What does happen often is that the building does not turn out quite as rendered. One of the reasons is that the renderings are created before the working drawings for the building are created. The working drawings are only created once it's obvious that the building is selling, and that's when they're designed down to the millimetre. The marketing renderings are being worked out much earlier when the building's plan have not hit that level of detail yet.
It was likely the original plan was to build as was shown in the rendering, but then something comes up when the plans are being checked and they find they have to move the wall in.
42