They target the top because the regulatory environment is such that it’s too costly to target middle and lower range properties. In places like Houston, there are tons of “normal” places being built. With land prices in places like New York and requirements to subsidize “affordable” units within the building, that necessarily means the market rate apartments have to be much more expensive to compensate. In Houston, there is no such thing as “affordable” set-asides because their isn’t a need for it. Houston also doesn’t set aside thousands of acres of prime land as “open space preserves” like they do in the Bay Area, further constricting available land. We can debate the quality of life value of “open space;” it would be a fair debate, but you can’t have lots of available but politically unbuildable land while simultaneously lamenting the lack of affordable housing.