I don't think I see a world where another office tower is built, likely for another few decades that isn't medical office like the one across from the new Cancer Centre.
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That is a ton of office space and there is just so much AA and A space I just don't see why anyone would build until these numbers are at least half of what they are today. Even Suncor looking at that Stephen Avenue Quarter site decided to negotiate to stay put and renovate.
I think we'll be in a world where office to residential or hotel conversions and residential development will be the driver's of development downtown for at least another decade to come, if not longer. Doubtful we will see very tall development happening in these cycles, I think what we'll see is a lot of under-utilized lots (surface parking lots, primarily) filled in with residential development of modest heights, similarly to what happened in Downtown, False Creek/Yaletown , Coal Harbour through 1990-2015.
We'll be a much better City in that residential-heavy development model anyways, so I could care less if they build another office tower ever again haha.