[Wigs]

Calgary used to have downtown employment of 140,000 or so (I believe the Beltline was included in that number for "greater downtown").
I can't recall the source but IIRC it was roughly 120,000 in downtown, and 20,000 in the Beltline.

Currently however,

Downtown: 29-30% vacancy or roughly 13 million square feet of vacant office space

Beltline: 27% vacancy or roughly 2 million square feet of vacant office space

To put that in perspective downtown Edmonton has roughly 18.3 million square feet of total office space! (Downtown+Government area)

Source: Q3 2023 Colliers figures

My guesstimate for Calgary would be 100,000-105,000 today. Maybe you can find a current 2023 number more accurate than that.