Downspout extensions - make sure the downspouts extend at least 5' away for the house (and see item #1).If you don't solve the grading issue, you must turn your basement walls into a waterproof dam that is 8-10 deep. 

Treatment can range from minimal to extensive counseling, rehab therapy, etc.

So for instance if i sell a mobile home for 5,000, how would i calculate the interest into the monthly payment?

@Matthew Moore Colorado is more extensive than most. 168 hours of course work.

@Cheryl J McGrath there are many calculators, spreadsheets, and resources out there for analyzing properties, but there's no fool-proof app that can tell an investor everything they need to know about a property--because REI involves a LOT more than just data.For instance, a musty smell in the basement caused by water intrusion, a neighbor with a loud barking dog, a floorplan that's awkward but that could easily be re-arranged, significant settling, the location of load-bearing walls, the routing of electric, HVAC ducts, and plumbing  --these are just a few of the MANY factors that might cause me to buy (or not buy) a property, but none of these factors will be conveyed in data or on an app. 

In the end I sent out about 400 +/- I did get 3 calls out of that 400, all of them were looking to get retail for a home in dire need of extensive repairs & updating.

I'm not saying that will happen to you, I'm saying you should talk extensively to a lender before you purchase so you know your exit strategy is caked into the deal.

I’m also worried that if the inspection does turn up mold, I would have to do an extensive rehab.

We do extensive research on incomes and demographics in the neighborhoods.

Last, there is a statement that says "all parties to this Note ... agree to continue to remain bound for the payment of principal, interest, and all other sums due under this Note and Deed of Trust notwithstanding any change or changes by way of release, surrender, exchange, modification or substitution of any security for this Note or by way of any extension or extensions of time for the payment of principal and interest, and all such parties waive all and every kind of notice of such change or changes and agree that the same may be made without notice or consent of any of them."