I am having trouble racking my brain trying to think of what local, already-existing employer has around 750 staff and doesn't already have decent space downtown.
In the financial/banking/services area, Investor's Group and IGM financial already have their own tower, Wawanesa is already building their own tower, I can't see Canada Life looking into building their own tower given their already-large building on Memorial, Ceridian moved into TNS, North West Company already has their own building on Main, and I doubt MPI will be moving anytime soon.
The other major employers in the region are in manufacturing or healthcare, so I can't seem companies like New Flyer, Motor Coach, Kitchencraft, Mac Don, Bison Transport, Standard Aero, Princess Auto, or Winpak needing space downtown.
As for government, given the transition to hybrid for many, I can see the Feds/Province/City wanting to consolidate space, not expand their footprints.
Some smaller, other employers I could think of that maybe would fit the bill: G3, MNP, Cargill, Skip The Dishes, or Patterson Global Foods?
Other than that, it's a mystery to me!