Have you not noticed the rise in groups like Proud Boys, Patriot Front, and the Three Percenters? Patriot Front has people on overpasses waving signs in my area and they are in the news several times per year for marching in different cities. Just the other day they were recorded in New York City, unable to figure out how to swipe metro cards to get into the subway, so dozens of them charged on through without paying, so it isn’t like they are staying holed up in rural militia compounds out of sight. Far right extremism is both active and on the rise locally and globally.
Approximately 2% of the buildings in the city where I grew up were built before 1922. You can’t expect everyone in a city to be able to fit into 2% of its buildings, even if you convert all the non-residential buildings in that age range into residential buildings. Hardly anybody could be bothered to live out here before air conditioning was available so the whole region is new construction.