Walking from Front & Bay to CIBC South, it dawned on me that CIBC North will be the first building that seamlessly connects The Financial District with Southcore. Not just through the SkyPark, but also at ground level - you'll be able to enter the lobby, walk south on the existing teamway (bright and wide, doesn't look like a tunnel) and emerge at the bus station / CIBC South lobby in Southcore. I know you can also avoid walking "under the railway tracks" by going through Union Station, but that involves going down and then up several levels, not to mention complicated detours (at least until all the renovations are done).