We did not agree to pay him that much and feel like he took advantage of us not getting the firm price on the front end.

Specifically in SC, though, I would check two things - 1) see if the ATI exemption applies and actually quote the taxes for that particular property on the county tax estimator tool, and 2) get a ballpark quote from your insurance partner on the particular property.

Might change it, might not.WA requires you to hold a brokers license and be under a managing broker for 3x years before you can have a firm yourself.

Is there a type of mortgage insurance or bond you can get for owner financing that secures his position? 

You seem extremely confident in your initial claims, take me up on it.Either way, I do appreciate the honest feed back on my posts from both of you, I understand that NY is one of the hardest markets to succeed in, but I am a firm believer in the Stockdale Paradox (Jim Collins, Good to Great).Best,-JonThis wasn't a back and forth.

Secondly, he again did not fully disclose everything and was pushing for the signature on the final closing documents, in them he has 2 seperate title agencies involved as well as a third party construction company listed as the policy holder for the insurance for the home, and the figures for sale are different from those on the sale agreement document that I did sign, with clauses included that state if the title is not free and clear that the buyer has the right to sue me for insurance purposes and to cover the silent second mortgage that I was only informed of because the title agency called me to say something was up after arranging the notary to come to me to sign the final documents (at which point I said no and had a copy of the closing documents emailed to me), and again the so called real estate agent negotiating the transaction is listed as the buyer (under the guise of being part of ushomebuyers.com, same as the agreement to sell). 

Quote from @Matthew Paul: If the man wanted to he could sell the house and keep the profit  Are you willing to insure the OP if she buys the house?

If your concern is liability, what I did was get an umbrella insurance policy on the properties I house hacked under my name.

This is a very common agreement, in your space your problem and they also should have insurance that if its extensive insurance would cover it. 

In the past with owning duplexes in Milwaukee, One rent paid for the mortgage and the other paid the property taxes and insurance.