We've been working to build some organic lists and I'm about to feed them to a skip trace service to get the emails and phone numbers.

What happens if they trash the place, don't pay rent and skip out? 

I don't like her and do not want to go thru her to contact the owner, but I do not have the owners direct contact info, can I just skip the property manager and see if I can get his number from someone else? 

I'll have to explore the S Corp option (skipping the LLC process due to additional costs) more after speaking to an accountant.

If any of those 4 don't apply to you, I'd definitely skip though. 

Why not skip the lawyers and just co host?

However, what happens when the buyer pays off his seller-financed note and learns that the seller has taken out a $100,000 HELOC on the property and skipped town?

@Angela Blaine you can download a list of cash buyers around your subject property from Propstream, skip trace it and cold call them. 

I spent about a year honing down on data mining, aggregation, cross-referencing, and skip tracing.

You should consult a tax professional but Im going to say skip the LLC.