I never looked back and I love my life.  

You are a high w2 earner, The house is worth 110k today, you are buying from your grandma for 60k in exchange for free rent for life, upside ARV of 200k.The costs of owning the house will help provide tax relief on your high w2 earnings, you are buying a great chunk of equity that will pay off in the future, and you and your grandma are doing each other solids. 

I would talk first to an electrician as many do fire alarm and life safety.

Consider putting the property up for sale and get your life back on track, then try investing again.

It will be even harder as a young person with no life experience, and particularly no experience buying real estate. 

It will depend on your preferences and how well you think you will tolerate having a room mate as you approach a new life with your partner.

The owner took the back end profit for his park during the life of the POHs now wants to cash in again.  

And this is a biggee wading through the fake lenders or the Joker brokers that tell you what you want to hear  but cant get the deals funded and you lose the deal and a lot of money.3. with actual PML  private people  usually have very limited funds so cant scale with them.. they can have a life event and just stop doing loans all together..

I've lived here my whole life and have really seen a dramatic change in this amazing city. 

Okay pal, go with them I am sure it will work out the same (sarcasm) (hangs up phone).Like anything in life, you get what you pay for.