Evidence please.
The development you cite is the one I had in mind off the top of my head.
The subway entrance is unrelated to the Colonnade.
There is no existing Colonnade either; the compelling argument here would be a combination of heritage preservation and sidewalk capacity as the sidewalk outside the building facade along Dundas is somewhat constrained.
I'm unaware of another proposed colonnade being shot down by Planning; but perhaps there are some, if so, please offer up examples.
I also didn't suggest the City was pushing for them, merely that they support weather protection for pedestrians, and had approved a colonnade elsewhere (which they have)
While lacking in the historicist grandeur........there are other recent examples.
First, the definition from Mirriam-Webster:
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I would add for our purposes, contains a pedestrian walkway between said columns and an adjacent building.
This is Monde down on Queen's Quay East:
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Going back to the 80s we have Waterpark Place:
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Waterclub also has this design feature:
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These features are common throughout many developments.