Canada Line | Completed

[officedweller]

The UK Building stairs are a broad flight of stairs - people can walk around it. For all we know, the entrance may be reconfigured in the future (or the building redeveloped).
Above grade, the elevator and the escalator entrance can't be lined up because below grade, that would mean that the elevator shaft would block the foot of the escalator.
Having the entrance south of Hastings is much better for CBD access than having it north of Hastings.

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The number of entrances would have also been kept low to save on overall costs - including escalators, ticket machines, future fare gates, etc.
At 41st and 49th, the decision to build underpasses rather than the preferred mezzanine stations (like Broadway City Hall) would have resulted from the additional cost of excavating a deeper station and guideway to allow for a mezzanine. (i.e. the cost of digging an underpass under the station, versus the cost of digging to lower the entire station to fit a mezzanine above it.)