There are some VERY extensive renovations going on in
55 Arthur right now.
The area to the left of the entrance to 55 Arthur, along the tunnel (has the old Whitla Lane sign) has had the entire floor dug out and foundation rebuilt from the inside. They're building a wheelchair ramp inside that space that appears like it's being built to service some new (maybe prospective) tenants for the main portion of the building. There are also a ton of permits and construction notices up in the widow of 55 Arthur proper, which appear to be separate from the foundation work – they're really high off the ground and hard to read.
Whatever is going on, it certainly appears like this extensive work is happening in prep of someone taking over the main floor.
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Side note it's incredible to me that they're already starting to plant flowers, yet there's full stand dunes on the sidewalks all over downtown and the Exchange still. Does the city not have proper equipment? It's like they only do the main path of the sidewalk with a machine and ignore everything else, it's disgusting around benches, trees, signs, bus stops. The beautiful new John Hirsch Place is like a full on desert.