There is no such thing as “affordable” housing. Affordability is not a characteristic of housing: It is a relationship between housing and people. For some people, all housing is affordable, no matter how expensive. For others, no housing is affordable, no matter how cheap.
Stone, Michael E., "Unaffordable “Affordable” Housing: Challenging the U.S. Department of Housing and Urban Development Area Median Income" (2009). Center for Social Policy Publications. 36.