So I was wondering what methodology you used to value the duplex and put in an offer?

Fact vs. fiction, understanding methodology and systematic approach. 

I'd suggest you check out Cleveland, thats where I invest, live, and practice the ancient art of real estate :)  I am sure you can find a home around 50k here no problem.

It includes, among other things, a comprehensive map of the Cleveland area, grading each area from A+ down to F, using a consistent, objective and transparent methodology using publicly available data.

If the home is completely gutted and opened up it will look like a can of worms behind those walls due to the ancient building methods.

They would then orchestrate the titles, rules enforcement and collections, under your supervision.On the 38 titles, you need to become an expert at the methodology and title laws in your state (start off by joining your state mobile home associations [MHA]) and you also need to know if your state allows you to "gift" the homes to the current residents which may exclude you from having to produce the actual title or warranty of condition.

It has been big helpful in understanding how the BRRRR strategy and methodology work.

Cost for new tank and lines: $4000- Ancient HVAC at another house failed (I was expecting this one) - another $4000.

Contact your state mobile home association (MHA) and find out the requirements and methodology to get replacement titles.

@Tristan Colborg I like your methodology, I would have done the same or similar.