@Dhondup Chime
750k sounds kind of high for a 2 family in Greenville and the owner is offering 50k in credit which makes me both happy for you and suspicious at the same time haha. Evicting a tenant now is a little tough because of COVID as your attorney pointed out.
Also with so much down payment, your mortgage will be $3200 and rental projections of $3600. There are lots of expenses you should try to budget in like vacancy, repairs, capex, utilities (in NJ the landlord pays common electric), legal, etc. so you could be in the red for quite some time. There is the appreciation and tax depreciation side as well but just my initial thoughts.
Also I am not sure if the bank preapproved you for 700k with 20% down as an owner occupant which can be an issue during underwriting because both units are occupied thus not owner occupant. I usually see 25% down for investment property with higher interest rates.
Feel free to DM me and we can chat further.