mobile home park 1.6mil deal?

[Ronald Wilson]

Have found a man retiring and selling his mobile home park for 1.6 mil, 39 units 100%paying and occupied grossing 186k with expenses 67500. He's seller financing with 30% dn. 

If i have this right, that is a13% return,  if he holds for thirty years. .. and how would i use this information to look for local investors and create a deal that still leaves money for me as being a party of only a small part of the investment. 

Thoughts from any on how to wrestle this into an asset would be great.