12 Unit Owner Financing for Down Payment - Need Help

[Rob Lalumendre]

I'm looking at a 12 unit apartment complex and need to create a deal with owner financing for the down payment, can anyone with experience with this give me some advice and what to be sure not to miss when structuring the deal? 

I currently own a 4-plex, so this is a big step up, trying to put together a deal that I can make work without having all the down payment myself.

Thanks, Rob