Prior to a car running into their building and destroying their home they did have 3 dogs. 

@Derek Scott , I too think depends on the area and would be a good metric to watch when comparing houses that are close or in the same county. 

The Tenants agree not to permit any deterioration or destruction to occur while they are occupying the property. 19.ALTERATIONS:Tenant shall make no alterations, decorations, additions, or improvements in or to the premises without Landlords’ prior written consent, and then only by contractors or mechanics, or other approved by Landlord.

Is there anything I need to do prior going to the bank?

You do have to get educated first prior to starting out.

They do not teach appraisal or comparative market analysis in real estate school.

Fixing that would not be too expensive...compared with the cost of tunneling to find out where the separation happened ($$$$).Lender won't approve loan for house with foundation issues?

How much more of a factor is the market, compared to the numbers on the deal?

We prepped did a walk thru 2 weeks prior to order any needed supplies, we did some repair work early if we found that we could, Our Painter was not in house he was FABULOUS,, he would work non stop, and others followed as soon as he was done.

My main concern is that I don't have any construction background and I have never rehabbed a property before so I don't have any real world experience regarding the costs associated in doing so.Once I find a deal that looks promising on paper and I physically go walk the property with my realtor how am I supposed to determine a rehab estimate without any prior experience?