Brooklyn is the closest by subway to lower manhattan. He may want to look there. He can focus on the circled areas. Getting a roommate is going to be cheaper as rents are very $$$$. Good luck to him. He won’t really need a car as most of that area of Brooklyn is walkable.
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From the circled area, you are looking at 20-30 mins on the subway.
THIS. ⬆
I could have written this myself. There is no such thing as living right in the financial district. It all closes down after 6-7pm and becomes a ghost town. I find it eerie even during the days on weekends when I've had to go down there. People
work in the financial district, not live there.
While there are some areas in lower Manhattan, I think he'd have a better time in Brooklyn. He'd be in
normal neighborhoods, (considering NYC.) And he'd have
normal local eateries, supermarkets, laundromats, dry cleaners, bars (once they fully reopen,) and movie theatres and entertainment with more post grad people his age. Not a lot of 24 year olds can really afford Manhattan to live. If he needs to take a taxi/Uber to or from work or staying out late, every once in a while, they aren't nearly as expensive as taking one to NJ, which automatically is DOUBLE the fare PLUS tolls.
Sure, he can find a place in Manhattan, but then he'd be spending ALL his money on rent, especially if he wants to live alone. If he's working in finance, he should be financially smart enough to not want to do that. There are PLENTY of other living expenses here in NYC to HAVE to spend and splurge money on. We have one of the highest costs of living in the U.S. Many expenses in the first couple years will be unforeseen necessary ones. Some spending will be stupid ones, like eating out/take out for EVERY meal and taking cabs everywhere. Having nearly all of his laundry dry cleaned since he needs starched shirts anyway for work. Then wondering where all the money went.

Things that one only learns by living here for a while and learning in hindsight.
And he may want to really think about getting a roommate his age. There are roommate services here. Living here can be quite lonely at first, negotiating the city, and that was even before COVID. While he can ask his co-workers for tips and advice and to go out for drinks with after work, that gets old after a while, especially if they aren't his age, or he really doesn't gel well with them other than on a work level. It would be nice to have someone at home to hang with, or at least, are going through the same things his age. Many people I've known say it takes about a year getting through the culture shock of living here.