Office-to-residential conversions don't make economic sense here the same way they do in Calgary. Our Downtown core already has high supply and has consistently decreased in per-unit value since 2009.
Conversions are useful when the list-to-sell ratio indicates a strong seller's market in a neighborhood with high commercial vacancy rates. Downtown just finally got into balanced market territory in 2024, after years in buyer's market territory. We have the high commercial vacancy rates, but we do not have the residential demand.
IMO businesses won't move into Downtown until rental rates decline (landlords are still pressuring DT businesses to recoup their COVID shortfall), and the only way rents will decline is if demand stays low. There is also the consideration that landlords make the bulk of their money from the underlying property appreciation, so tenancy is less important, but there's not much that can be done about that. If anything, OTR conversions would exacerbate this problem.
In a perfect world, the ATCO site will just get refilled by another big employer offering well-paying jobs.
EDIT: No offence intended, Ian.