I don’t know the answer to your question, but I will share an impression.
I lived in Brooklyn or Manhattan until 1980, and I have visited frequently since.
The changes in the first two years of the Giuliani administration were real, and they were enormous. There was some washover into the early 2000s, because a lot of bad guys were still Upstate, as we say.
It’s getting worse again, and pretty quickly - but NYC is nothing like the nearly all-black cities of the midwest and southeast, crime wise, and probably will never be. Brooklyn is gentrifying in places I never would have thought it could happen.
YMMV, of course.
Bet you can’t wait to go back after Quinn is elpected mayor..