Hi @Ryan Cheung, I'm an investor from West New York. I recently used an FHA loan for a 3-family in the area.
1. My lender used the appraised rents for vacant units and actual rents for the 1 occupied unit in their 75% calculation, so you should be fine on that front.
2. Rents - For 2 bedroom, 1 bath apartments (or any unit for that matter) the rent really depends on the location and condition of the unit, which we don't know. However, unless you're in a really nice area of Union City, I'd say $1500/month is at the highest range of what you might expect to get, today. And you never want to analyze a deal with the best case scenario. To be conservative, I would use $1300/month as your figure. Anything more is pushing it IMO.
3. Rent stabilization question - I don't see why you wouldn't be able to keep rents the same when you leave.
4. Homeowner's insurance - Did you factor this into your expenses?
5. From an initial pass, this looks like a decent deal. Best of luck!