In the '90s I visited my former teachers who were living in Dorchester. The couple shared a huge Victorian mansion with a group of other professors who taught at various colleges around Boston. I was amazed at the size of the place, because it housed at least five families and their children.
Shortly after that, I attended a lecture that included a presentation on how Boston neighborhoods had changed since the 1800s. They’d color-coded each one based on the largest ethnic group. As the slides moved forward, it looked like each group was chasing another around in a circle. The only major difference was in home ownership, since some groups were only allowed to rent properties. The Boston Globe article on this has been paywalled, but here’s an overview with links to other sources: