It had rotted siding, windows, trim, wood framing, etc throughout, overgrown trees, roots, outside slab cracks, outdated and worn out kitchens / bathrooms, floors throughout, rodents in the attic with torn insulation as well as torn HVAC conduits, leaking sky lights, etc, etc, etc.

The result turned out to be a combination of tree roots and baby wipes.Well tree roots are tree roots, but I lived at my house for over 2 years and have never used baby wipes and do not have a baby.

Since then, I've completed the UBG and culminated (finally) to a book rooted in practicality, Frank Gallinelli's What Every Real Estate Investor Needs to Know About Cashflow, and with my new findings I'll transition to questions.Question:With Gallinelli's book, I've decided to dive in on Redfin, Loopnet, etc. and try my hand at some calculations.

Care needs to be taken if there are trees growing on the fields as the roots can damage the system.

Also, the fan in the master bedroom had a blade with a missing bolt which was causing that blade root to rub against the housing and make a loud noise.

We've brought in two dehumidifiers which are helping, but I'm not sure what the root problem is or even who to ask for help.One contractor said moisture is coming through a hole in the exterior stucco, but another said no way because the vapor barrier would block it. 1st one recommended installing insulation, but I've also read this can increase condensation problems.

Trying to use efficient market hypothesis analysis that has roots in securities analysis isn't going to work well.  

Look for cracks on the sides of the house, trees whose roots may be too close to the house, leaning structures attached to the house, these are basic things you will be able to spot without an inspector.  

I am familiar with the area, and I think it will take some time for changes to take root.

There is a break in it, with tree roots inside.It has become apparent the previous owner knew about it and did not disclose it and is now lying about it.