Sure you can. I've seen it done numerous ways. France is a good example (above) - not only is the boulangerie 2 doors down, the others are literally within 10m

Sure you can. I've seen it done numerous ways. France is a good example (above) - not only is the boulangerie 2 doors down, the others are literally within 10m away by walk. In Hong Kong, some of my friends lived in a tower where the grocery, post office, etc were all on the basement floor (and the elevators were unbelievably fast) - I swear it was the closest thing I'd ever seen in this world to Foundation/Trantor. When thinking about a car, you also have to chalk-in parking and traffic. I bet you most people spend more than 10m door to door to their grocery store.