I don't think it's so much the financial uses pushing out restaurants and retail but rather housing that's being pushed out. In Toronto the Financial District

I don't think it's so much the financial uses pushing out restaurants and retail but rather housing that's being pushed out. In Toronto the Financial District doesn't go completely dead, but the 4million square foot underground mall shuts down, and it's just a few ground level businesses that stay open. It's still more lively at night than the typical suburb, but not as bustling as the adjacent neighbourhoods or as the Financial District during the day when there 200,000 office workers there (vs just a few thousand tourists and residents within walking distance at night). From what I heard it's not as dead at night as the Chicago loop.