Suggestions on structuring a Multi-Family deal with investor

[Jared K.]

I purchased my first multi last year (3-family) and am currently living in it.  I don't have the funds or equity yet to purchase a 4-family that just went on the market 3 doors down.  The math looks good, but don't have the 20 to 25% down to get it.  I do have 1 or 2 investors that I may be able to structure something but have never done it before.  What would be some fair scenarios/contracts I would set up with someone who has the 20% to put down but I would be the one maintaining and taking care of everything.  I know I could offer a straight up % of return on his money and/or a percentage of the ownership.  What would you do in similar position?