You don’t try to turn the rock and soil into gold.

Start out strong building that healthy reputation and it will follow you throughout your life. 

By the looks of it i would say your Dad is right, it looks like the concrete has deteriorated due to water. you do not need a foundation co. just hire a mason to cement it back up inside, but first take care of the cause on the outside, get that leader pipe to drain away from the house by either extending the pipe above ground or dig a shallow trench and run a pipe under ground away from the house. also make sure the soil around the house is pitched away so that water moves away from the house.

Soils Report.Is there a street?

Compare the two and look at the similarities or differences.Is there a healthy mixture of majority and minority people living in the area?

This total is about 25%, so your 10% security margin seems low.At 5% down you would want a fairly healthy reserve fund for unexpected high cost maintenance or vacancies as you have very little equity available.As it is, you're catching a falling knife in Grand Prairie and it is certainly conceivable that property prices and rents could fall a further 5%+ over the next 12 months, putting you in negative equity and cash flow territory. 

I can't imagine you'd want to take it as-is with the tank, because if you try to remove it after buying and find the soil is contaminated, and possibly contaminated the ground water, you could be looking at a bank-breaker of a job.  

Sorry I have not gotten back to you sooner.I am back on US soil now and will call you later this week.

If one looks at underpinnings, "as a whole" the US market should keep modestly expanding over the next several decades - we have a healthy birth rate, good influx of immigration, diversity of household, and plenty of land to build and rehabilitate.

I would plan on putting $400 away a month for cap ex and repairs to start, but it's pretty newly renovated so I expect that will build to a healthy cushion early and I could back off the repair budget (still doing a few hundred for cap ex) after 6 months.