St. John's has a few downtown - but completely average.
The only one we have that's at all unusual is the largest at the Memorial University of Newfoundland's campus, which typically relies on the MUNnel (underground) tunnel system.
It's a massive skywalk that contains the food court, cafeteria-style seating, and the chain restaurants like Booster Juice, etc. And it crosses the Prince Philip Parkway, which is one of the busiest commuter routes in the city (part of the inner ring road system).
Here's a view of the skywalk from Google StreetView: