But I also know they are not a construction company.

I'm thinking it could be my own kind of lending company; lending to RE investments, other businesses and projects.Thank you in advance for any help!

You can set up a DUNS number anytime and, say for instance, if you AMEX BUSINESS card does not show up on your DUNS report, you can contact DUNS and request that they research the account and include it in your report.

My company ensures all legal requirements and best practices are followed meticulously.

You would need to report all of the payments he makes to you as income, including the $20,000 option fee. 

You can plug these values into a mortgage calculator and BAM, out comes estimated equity. unless these companies are getting credit level information you have no way of actually knowing how much equity is in the home ( unless you see their bank statement.. )

OMG his special reports on the NAR Trial last October were just him reading some random news article, painful lol!

If they use third party companies for these services?

Which I have done. it. all.To top that all off, the insurance company made me put a new roof on both structures (I think the roof had a bit of life left in it, but ok) - another $11k - and the main house needs around $6k worth of electrical that the previous owner didn't do properly ("fully remodeled" my ***).

In addition, tou may also want to look around for third party reviews on the company.