In this case, the "missing middle" is what cheaper living looks like outside of a big city center. In the big cities, high rises are used because the city is literally out of space. Outside of a big city, single family homes are more popular because people almost unanimously want to live in them. But those who can't afford to live in a single family home, but live outside of a large city--those people live in places that look exactly like all the "missing middle" pictures in the article. Nothing in there looked unusual to me. I used to live in places like those. Now I don't, because I upgraded to a single family home.