An influx of young professionals and a consequent push of older, browner folks out. A bunch of neighborhoods in Southeast have changed character substantially in the last couple of decades.

Not that places have to remain static, but these are neighborhoods with a long and interesting history. DC isn't just a government seat. It's a real city, sandwiched between the Confederate capital and a slaveowning but non-seceding state. That gave rise to a unique culture -- including having one of the nation's most prominent Historically Black Colleges and Universities.

That culture persists and evolved, and it's worthwhile to consider that rather than simply replacing it. Exactly how to do that, though, is an ongoing challenge.