I believe you've missed the mark on comparing this project to the CN Tower. Both very different projects, sites, and structures. Also your 4 months down 4 months up on excavation and U/G structure ratio rarely is ever made on schedule unless you are working on an "perfect" site with no restrictions, no equipment failures, & perfect shoring system. - If any reaction to this is "aLl My PrOjEcTs CaN dO It" - happy for you - most don't, even at the WELL, they were late and that's a giant site with lots of mobility. Now a days with an eroding workforce of skilled trades as less come in and more retire, major trade companies are spread thin to perform the work or have multiple "A" team to perform said work - all projects are getting a little longer whether you accept that reality or not.
That said, this hole is also not 4 levels down, but actually the height of 6 levels, 4 + concourse, not counting an extra level just to the underside of foundations for the mega caps - so excavate to 7? - it's not a typical parking structure - Oh should I add in addition shoring just to excavate the elevator overruns on the west core? Plus not to mention the forgetfulness when doing the math - the caisson wall installation on this project, the drilling of the smaller foundation caissons drilled from the top, the tieback installations that have to be set & tested prior to excavating each level, the different shoring system under the historical facade, installation & removal of interior bracing, should I keep going?
If you want to make comments off the seat of your pants, you should have a better detail of the construction facts for next time
. When planning this project or any project there is a lot of thought put into excavation & below grade staging - the time "was" (key word) planned correctly.
As per everything else that has happened on this project with regards to the city, the developer, Dundonald - I can not comment, but it's been frustrating on all counts and wish I could share more.