Does gentrification destroy diversity? Or does it thrive on it? Boston's South End, a legendary working-class neighborhood with the largest Victorian brick row house district in the United States and a celebrated reputation for diversity, has become in recent years a flashpoint for the problems of gentrification. It has born witness to the kind of rapid transformation leading to pitched battles over the class and race politics throughout the country and indeed the contemporary world. This subtle study of a storied urban neighborhood reveals the way that upper-middle-class newcomers have positioned themselves as champions of diversity, and how their mobilization around this key concept has reordered class divisions rather than abolished them.