How should this creative financing be structured?

[LaTara G.]

What are some creative financing ideas based on the following.. An owner has a small residential multifamily they want to sell for 400k I want to pay 300k. They have a small mortgage balance and the reason he gave for selling is to get a lump sum of money for traveling. I realize there aren't many details but what are some ideas including assuming the mortgage, seller carry, etc.. please state how you would approach the owner and how you would structure this thanks