^ I think you're dead right. It's not the big P&M towers that will pay the price for TNS, it'll be the smaller commercial blocks whose tenants will be able to afford the bigger towers that were previously off limits to them.
Think of buildings like these ones, which are in many ways the unheralded backbone of downtown streets... when you can get cheap rent at 360 Main no one is going to bother improving them. They will just slowly go to seed.
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source: winnipegofficespace.com
I get as excited about new towers as anyone, but I have to admit that when I stop and think about it, it seems to me that TNS in its original iteration is more than big enough for downtown Winnipeg's purposes. I realize that Longboat may want more space because it knows it can lease it profitably, but that's not quite the same as what's best for downtown Winnipeg generally.