The seller is also claiming that the 2nd unit tenants have vacated as that was part of the agreement and he will lose money. 

Theres a 4 unit "Inn"  located in cape Canaveral right now im looking at but I honestly dont know where to start.

I manage about 65 units and at times my largest cleaning provider may be getting $20,000-30,000 from me. 

It's been less of an issue with my first two properties which cashflow at 3% interest rates, but the latest unit is cash flow negative on a 7% interest rate.

We have grown over the years to manage 11 buildings and 25 units.

While I’m open to 6–10 unit properties, my long-term goal is to work with 20–300 unit buildings where I can put my skills to good use.

If you are planning on living there (ie in 1 unit) then you are house-hacking and this is a different calculation consideration then renting out both units and making it a true investment.

He has three options.(1) Pay off in full(2) get a partnership to buy more house units(3) get into a bridge loan or bank loan to be removed from an FHA loan

@Eric JonesPerhaps a poor choice of words ... it's a consequence of being illiterate in two languages ;-)Through changing (hopefully lowering) the principal balance several times over the course of a period, you are changing the amount of interest accrued (or balance of interest owned/due if you prefer).We are on the same page here ... just some language differences.

Do you want to sell off some of your units?