Hey @David G Aburto, I am not an attorney, so in no way is anything I share on here any type of legal advice. If you are thinking of investing in Union City, more than anything else, read through the code and/or talk to an attorney.
However, from my understanding of Union City code, if you can no longer claim the owner occupancy exception, then standard rent stabilization (of only being able to increase rent each year by 3%) would apply. Which, 3% is basically just enough to keep up with inflation (which historically is around 2%). If you are looking for cash flow, then success or turning a profit on a property in Union City would depend on your ability to get the property to market rents. Once the property is at market rent, then 3% increase actually is not that bad. If you are able to rent a 2 bed unit out somewhere between $1600-$1800/mo, then 3% is somewhere around $50/yr that you could increase it. However, if you find some really great tenants that take good care of the property, you might not want to increase it the full 3%. A great tenant that pays market rent, doesn't destroy the place, and doesn't bother you all the time, might be more profitable and more desire-able in the long term (if you don't have to spend as much on repairs, vacancy, and advertising, etc) than trying to get your rents to the top of market.