The demand side of it is that with every decade, the midwest's manufacturing economy shrinks, and more of their population empties out into the coastal cities. The supply side of the problem is detailed here: https://i.redd.it/ibo81s465yy11.png
Except midwest housing prices are constantly rising too. Obviously not anywhere near coastal cities, but Midwest city housing prices keep going up even as the manufacturing economy there supposedly shrinks.
I think the missing component of the demand side is the prices of these places. Even with bank bonuses, the numbers are so astronomically high you have to wonder how so many people can afford them.