Check out a blog post I did on the BP blog about co-gp/JV structures for syndication that go into more detail on this topic. 

We would be looking in the Philly market.How would you recommend structuring this partnership? 

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It is really hard to compare apples to apples here because seller financing allows you to do more or less whatever terms you and the seller agree to, that could be amortizing over 30 years or it could be interest only over 3 with a balloon at the end, so you can propose different structures to get you where you need to go.

We would be looking in the Philly market.How would you recommend structuring this partnership?

But assuming there hasn't been any major upkeep done in years, keep in mind that you may need to shell out some $$$ on neglected repairs once they move out.

While I dont know the details, here is some info for the gift of equity loan structure.... this info is what the mortgage folks would be using.  

I never intend to live on this property but would either like to find something with a house already on it or ultimately we will put up a barndominium or some other unique structure to use as an airbnb.

One way to structure this is to pay the commission on the sale, and get a credit equal to half that commission on each of the subsequent deals.Many agents are willing to do this, many are not.

Or maybe find a partner who would buy with you and then you can structure an agreement where you buy that partner out over a specified period of time, with periodic payments or something agreeable to both of you?