DC is probably the best example here. They did a great job of cleaning up the city. Now all the federal employees are working at home. The cops are no longer enforcing the law. All the restaurants are closing now. The Wizards and the Capitals are relocating to nearby Virginia in 2028.
It’s been intermittently a disaster since the first Home Rule mayor, Walter Washington, lost out to Marion Barry. Some have done better than others; but the current one is a dimwit disaster. (I say that as one who, when Bowser was first elected, had hopes that she would do a good job. But she’s turned out to be just another political hack whose backbone can’t stand up to anything.)