Proper paper workMy questions do reach beyond these topics but I'm trying to not make this out to be super long. 

He may not actually have a license and in that case he can't collect anything and could be subject to sanctions imposed by your state for contracting without the proper license.

I got an estimate for $1950 to properly dispose of this material in the DC/MD area.

Keep it simple and buy it in your name, with the proper insurance in place.

Stop thinking selfishly, the sooner we find the carriers and isolate them, get our medical supplies in order, learn proper techniques on how to avoid getting sick, the sooner we go back to normal. 

While setting up a company is not absolutely necessary to do maintenance on properties I own, it (along with the proper licensing) allows me to do work on homes I do not own.  

The 'proper' way of fixing this is to remove every speck of this old dangerous wiring and replace with new 3 wire with proper ground. 

If he is asking you how he is going to get his money back that's a huge red flag to me, as any lender should understand how collateralization works and the documents and procedures he'll need to go through with you and the title company for that all to work properly.

The hard part here is that this was never a real BRRRR because of the numbers.BRRRR is about leaving as little money in the deal as possible, it starts with the right property,Next; an appropriate scope, 3rd making sure your rents are realistic and proper for the area.When you refi, often the best LTV is 75% ( I suppose there are exceptions, but conservatism is what wins this game)Last, your supposed to repeat the process.

You have bigger fish to fry - namely, what sounds like an incompetent property manager and your negligence in properly managing your business (i.e. not renewing your umbrella policy, etc).