The predominant change in American urban neighborhoods, the one to which low-income residents are most commonly exposed, is not gentrification but decline -- concentration of poverty, mostly for non-whites, in part due to white flight. https://www.law.umn.edu/institute-metropolitan-opportunity/gentrification …
Online, urbanism discussions are dominated by arguments over gentrification. But consider: "Since 2000, the low-income population of economically expanding areas has fallen by 464,000, while the low-income population of economically declining areas has grown 5,369,000."
Whites fled to the suburbs, taking the tax base, good schools, and political power with them. Low-income & communities of color were left behind. Millions of poor people are now clustered in decaying urban areas where no one is proposing any luxury condos, or anything else.
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