We have been waiting for him to sign the addendum of the price update and provide some documents for the title all this time. 

All of which are well documented on the forums.

It is a lot of traditional sales.Go on the websites of Sirva, Sedgewick, ALE, CRS, and others and submit your housing to them.

All states and counties are different, so you need to read through the county documents carefully and consult a local real estate lawyer.Some counties will only sell the tax debt. 

I care less about the payment process and more about communication, accounting, documentation, processes, etc.

Submit a freedom of information request to your local fire department/ fire investigations department.

You would have ongoing filing requirements with the State and would need to keep business records and documentation.

Yes I am just going to go forward with submitting to the GC the mfh plans and get a quote and compare that to his already quoted cost to build sfh.

Saying there are three people living there when only one is on the lease is good to know, but hard to prove; getting video documentation of three people consistently entering/exiting the property substantially alleviates that difficulty.During your due diligence process, you probably obtained a copy of the existing tenant's lease to review.  

Leave it to the experts is my recommendation on drafting all the documents after the terms are agreed too.