With a few exceptions new construction is high end. There are a few areas that were designed as slums from the beginning: Lower East Side in Manhattan, parts o

With a few exceptions new construction is high end. There are a few areas that were designed as slums from the beginning: Lower East Side in Manhattan, parts of the West Side in Chicago. Taking Silicon Valley, if 25,000 high end apartments were built, that would take a lot of pressure off low end, because well paid people wouldn't be taking them out of desperation.