[IMBY]

Minneapolis' skyways system is on a par with the Houston tunnels, which I traversed a few years ago.

They have condo buildings on the skyway system in Minneapolis. Live there, and it's snowing, below zero outside, you don't even need to put a coat on as you traverse the city in the depth of winter! They call Minneapolis the 2nd story city!

If I were going to open a sandwich shop in either city, it would be a dillemma:
Outside or inside? Which would be more profitable?

When I was there, it was like a ghost town on the streets, it was a very cold December day, and I can imagine what it's like in summer with their excruciating humidity, along with heat. So I can't fault them for wanting to be comfortable a good portion of the year!