Condemned house on my block

[Denise Holder]

Hello, I have this house on the end of my street. It is condemned, the owners are hoarders, the husband is fighting for his life with cancer, they're doing a several-month-long-DIY move to Tennessee that they must be losing money on.   Although these people are friends of mine I need this house to be mine.   I want to clean it up, get good renters in there and improve the look and value of my neighborhood and have it as part of my retirement portfolio.  Oddly, the day I moved into my own house 3 years ago I said to myself, 'someday I'll own that house".  For all its garbage filled yard and filthy outside, it has charm and a good location.  Waterfront.  There are multiple problems. These are the top two.

One: I'm (voluntarily) unemployed, Don't know how I'll get financing.

2) They think they're going to get $75k for it. I think more like $35 ($45?k).  But I do not know how to "run the numbers" on a house like this. I can get comps for houses with the same number of bedrooms and such that are clean and basically maintained. But how do I dig down to the value of this house?  This is my primary question! :)

Thank you!

Denise in Warren PA