.”, wouldn't he have to pay the attorney the additional $18,000 to actually own the house before selling it, or did he secure a payment plan or loan for the rest, then sold the house and payed off all monies owed?

I already spoke with @Phineas Howie about this earlier but will publicly state my opinion for the benefit of others.I do not consider medical collections because they are extremely common and I have no way of knowing what stage they are in.

You need the buyer to understand they will keep the security deed until/unless you completely pay them off. 

You can go to small claims for that, in case you don't have a security deposit to cover it and the damages already

Additionally, for purchases, it's possible to do portfolio, but it is difficult as you're working with 5+ different sellers at one time to secure one loan.

You can secure offers on the property.

It’s about protecting the public.

I am a new wholesaler working my way down a list of property owners that I obtained through public record.

Think of all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

They may not do full public offerings but they very likely are taking outside capital.