Ok, so I am a vet, which makes getting one 4 plex done, do you think it's fair for me to ask him to finance the remaining 4 plex with no money down? How should I approach this?

Really vague post, can you provide more details? Rents, area, expenses, purchase price etc. 

I am trying to be vague. It's in a good city, very good rental rates, th price isn't too bad. The only problem I see is the seller only wants to sell both properties, I can only purchase one with my veterans loan.

@Bill Olive seller is looking to reduce capital gains. Maybe be open with him and sketch out the deal together?

@Bjorn Ahlblad

So that's what he's doing? Good to know!