What are the biggest challenges people have faced with this. Also how do I make sure to get good tenants?

Generally there are multiple units for each "zone" if you will when I've seen them installed.Regarding your problem at hand, I personally would simply adjust your plan to move and make your initial plan to get the current issues resolved, while costly now, in the long run holding onto the unit will likely pay off. 

Now here's my problem.

Enhancing Parking Facilities.

Exterior Deck or PatioAdding an outdoor living space like a deck or patio extends the usable living area and enhances the home's appeal, especially in regions with warm weather.In addition to these improvements, understanding the local real estate market and focusing on upgrades that align with buyer preferences in that area is crucial for maximizing ARV.Noah, thank you for this great feedback.

About 3 years ago she agreed to do a deal with me and we found the property and applied for the mortgage together and got to the inspection where a terrible problem was found with the foundation and that the walls of the building were significantly bowing.

The longer the better, but keep in mind that many of these structures have severe prepayment penalties so using 10 year debt for a 3-year hold creates a problem. 

But they probably have to diagnose their problems first.So what is the real reason 95% of the people fail in as real estate investors?

If it was a good company you wouldn't find so many problems with NWA(Riverside)

Anybody else having a problem with Deal Machine having really old or incorrect data?