It's not that complicated: buildings more than one story high, built out to the sidewalk edge, so that people who are, you know, all kinds of people can get into the building.
별로 복잡할 거 없어요. 대충 건물은 1층보다 높게 짓고, 도보에 닿도록 늘어서지요. 그래서 온갖 종류의 사람들이 들락거리지요.