., radon (which is found in nearly all air) is a widespread problem when it can "build-up" (as inside a property) and if that property has problems, then it's likely the greater region does too... the soil under the neighbor's place isn't going to be drastically different in composition, so moving on to the next property only avoids the issue in my opinion. 

Aside from all the things already mentioned, (cost of retaining walls, utilities, caissons, etc.) there's the cost of hauling dirt (determined by the type of soil the lot has and how far you have to haul it to dump it.

Foundation works scares me a little, especially the $40k + bids, soils and structural issues, and all the other unknowns.

Note: the basement floor is poured concrete, and is uneven in places, where it seems like the soil underneath has washed away and caused the floor to settle in some areas (not a huge concern at this point).I've had a number of contractors and waterproofing companies evaluate the situation and suggest anything from interior water proofing and wall repair (I-beams or carbon fiber straps), to exterior waterproofing and rebuilding the foundation wall.From my research, it doesn't seem that interior waterproofing will solve the problem, and the I-beams are only a temporary fix vs. rebuilding the wall and exterior waterproof.

If the site is unimproved and never been built on before, you may ask a couple survey guys to look at it if you aren't sure how good the soils are in that area.

For the ignorant dummy who responded do not judge me wether or not why or why not if I can reach out to these home owners investors who are struggling with elderly tenants Dont put words in my mouth if you are capable in that small brain of yours I will reiterate once more Now put your ears on ok never did I say investors should not profit or perform accordingly Now about greed in the real estate community of investing it does exist take your head out of the sand I will repeat myself Because I do not cater to ignorant people such as you seem to be I have met good people who are investors I have met greedy selfish people who are investors as well So don't assume as you have about my capabilities  Heres my question why haven't you reached out to provide solutions All you do it seems is point that proverbial finger at others and their opinions suggestions I hope you don't respond I don't communicate well with ignorance My words are ended D

We just refied 6 TH's in Sandy Springs with Bank South.

The soil may not perk for a septic system, the soil may be unstable or there could be flooding on the lot. 

Nope, you’d have to replace the required amount of soil with sand, or something that percs well. 

Makes sense when thinking about it- the US offers that as an incentive for investing on US soil, I don't think the govt wants to actively encourage foreign investment by giving us a domestic benefit.