If you go ahead with the offer, the fee is applied as credit towards purchase of the home.  

You would have to qualify debt to income wise but if the purpose of the home fit the guide lines rulebook, HUD 4155.1  You could buy your next home using FHA.There are a lot of loopholes when buying and using FHA, VA-Military, USDA, DPA-Programs you just need a seasoned mortgage banker who can walk you through the process ahead of time. 

I just purchased a 4-plex, but the previous owner does not have separate addresses for each unit.For example, I pushed 123 MainStreet and I want each unit to be represented separately, 123 MainStreet Unit A.Do I need to do anything official with the post office or city?

So I went ahead and did it, and then realized that there was no program that I could find where gift money was permitted for delayed refi.

It seems right now were we used to underwrite for current times we have to look ahead for the upcoming future growth of a value add property.

I went ahead and secured a HELOC.

Do all of your due diligence ahead of time, other than survey or title/lien search. 

Just putting it out there to see if I am missing anything before I go ahead with it.

We don't understand why you are pushing back on the feedback here.

We have chosen to push forward, and our locations have gotten larger with each addition.