If facts turn out as you described, the estate of the deceased sole remainderman owns the property... so somebody likely needs to start the probate process.

I called this neighbor and she described to me the drug deals going on and the loud music in the cars that pull up to the house at all hours.

I'm wondering if there is a better way to describe what I do or to answer the question, "what do you do for a living"?

I saw that I used a universal and you almost never should use them.However, the way @Nick Tzenevrakis described his situation it is a great way. 

I have it described as this:"Split floor plan is ideal for roommates with a master suite on each end or privacy for a new family."

Was the portion sold just simply "described" in the deed?

You essentially described scenario A with a different set of numbers.

If the election is made, the term "section 179 property" will include any qualified real property which is: • Qualified improvement property as described in section 168(e)(6), and • Any of the following improvements to nonresidential real property placed in service after the date the nonresidential real property was first placed in service. 1.

It would seem clear the purpose of the meetups you describe is sales, not sharing information. 

I don't know about the 30%-40% down that seems odd, but from what you described that is what it appears happened.