So, I borrowed the money from the person that stayed in my first house as she had just sold her house and made a fair amount of money off of it.

The schools ignore personal finance and business and hence people enter the world totally clueless as to basic concepts of business and finance.  25 years ago when I was financing small investors I made a loan to the purchaser of a small 12 unit apt complex.  

That I can set up for a personal goal.

If purchased with financing and the security interest represented by the UCC was timely perfected, I would have a completely different opinion.It is actually a loan, however, the panels are not attached to the property as is stated in the agreement:"Personal Property.

Seller Financing on Market Properties:- Yes, it can be used for on-market properties with motivated sellers.I am a Loan Officer licensed in multiple states, so if you would like to discuss further please feel free to reach out to me directly! 

I also feel we have done a 5 star job but if something fails, I would rather have a warranty in place for the owners . . 

We own both a mortgage company and a real estate business, we do a ton of real estate investor deals, and, personally, my wife and I have flipped or built dozens of homes.

In my personal opinion location of the property is paramount at the moment. 

@Agustin Conti personally if he wanted to rent a pressure washer to clean it, I would reimburse the cost but I wouldn't paint it.

@Jeremy MahoneyThese are very personal questions that require more info to answer properly but below are my answers.