Are there examples of large cities typically run by Democratic leaders doing better under Republicans?

I keep hearing Republicans saying cities that have high crime and other difficulties are doing poorly because the mayors of these places are Democrats.

Can you name cities that have voted in Republicans and suddenly circumstances got better? What did they do differently? Or, cities that Republicans were elected and nothing changed or things got worse.

I realize NYC is probably going to be named, but all cities and the country was doing better in the late ‘90’s so I’m not sure we can isolate a city during that time. Plus, NYC puts in socially liberal Republicans and “Republicans in name only” and is not really an example of conservative Republicans in the last 50 years that I can think of.