@Account Closed Yeah the benefit is the leverage you will have by doing this. With an FHA, you may want to refinance in about a year or two if it appreciates well, this way you can get out of having to pay PMI which is brutal.
If you buy another investment property and decide not to live in it, you're usually going to be looking at 25% down in NJ if you're going the conventional route on multifamilies. If it's a 1 family, then you might want to look into the HomeStyle loan, which will lend on 15% down for investors.
Alternative methods can be to go ahead and do another FHA loan, if you're able to refinance out of your first property into a conventional mortgage and owner occupy the second one you purchase.
Or you can look into hard money or private lenders. There are a few that lend on 15% down. If you find a good enough deal, I'm sure you can implement the BRRR strategy and pay back the private lender.
Finally, you can also look for potential seller financing deals which means you'll likely have to be active in your search for off-market deals (mailers, friends of family/friends, etc).
One thing to note, because there's so much competition in NJ right now, many sellers are not into waiting for an FHA underwriter to approve the mortgage, so you'll get lots of rejected offers. It would be easier if the house has been on the market for a while, and you offer a bit more than what others have been offering on the property in exchange for the potentially longer closing.