A foundation that has been repaired and is still buckling and having moisture infiltration problems is a very serious issue. Enough so that it's puzzling that after several offers and inspections from non specialists that the owner wouldn't get their own engineer's report. Perhaps they are afraid of what he'd find, and then they would be required to share that with any future buyers. So, they don't get the report, and put the onus on the buyer to do so. IF the sellers would pay for the report, I think I'd let the offer ride for now subject to that report. If they refuse, then you could pay for it yourself. ($500-$700 would be typical) but, you might be out that money if the report comes back with major work being needed and you decided to walk away. The problem is obviously more of a serious nature, and the fix will be in the thousands to fix it. How many thousands depends on the root cause and the ultimate fix. Completely regrading a lot with mature trees in existance on it that is adjacent to an easement not owned by you is fraught with unknown costs, including the potential for having to remove several trees and paying to connect to a storm drain instead of just doing some type of swale to direct water away from the house. I think that if you truly LOVE this house, that you should consider this part of the birth pangs of acquiring it. IF you can get it cheap enough. What "cheap enough" is, well, that will be up in the air until the engineer's report. Getting that report is probably worth it to you, simply because you've fallen in love. And, the other flip side to that is, if you provide the homeowners a copy of that engineer's report, they are required to disclose that information to any future buyers, so that would be the absolute FIRST thing I'd do with the report. Make them a copy, send it registered mail. They can't deny the facts now. And now, they are required to share them. This is going to sound nasty, but it "contaminates the field" for the sellers. They can't claim ignorance then. They either have to reduce the price to deal status for you or anyone else who might consider the property, or else they have to keep paying the mortgage on a house they've already moved from, or they have to let it go into foreclosure. Either way, you're the winner here, because you're the bird in the hand. If you push that angle, then you might end up with a substantial price reduction to make it worth repairing the foundation and drainage issues.

I have another opinion. For a house you're only going to live in for 6 years, I wouldn't like any of this. My concern would be that the person/entity fixing the damage is not in a contractual relationship with you. This can lead to accountabililty issues. Sure, the structural engineer you hire has a contract with you, but what is he/she signing off on? That the work meets minimal standards? To me, it might not be the same thing as a contractor offering you solutions of A-quality and B-quality, depending on your budget and that you can make a decision on. I hope I'm explaining this well enough. My secondary concern would be that when you sell this house in 6 years, the market might not be so hot then, and you may have a whole host of items that you will have to disclose... may make the home harder to sell. (It might not). But there's a risk there. Thirdly, for a house you will only have for 6 years, you have no guarantee that you won't be suffering with fix-it items during those 6 years. It just doesn't sound like a great way to spend 6 years-with a money pit.

Was there no professional inspection before the purchase? IMO none of the concrete work would have been acceptable. Hire a strucutral ingineer to inspect it ASAP. Maybe some if it can be repaired but some may need to be replaced. I doubt you can get anything from the seller unless the building condition was misrepresented or it violates the building code. When you buy a house, the rule is Caveat emptor... let the buyer beware. Warranties would only be from manufcturers of new appliances and equipment if they were given to you.

2 basement walls were rebuilt, they had to lift the house. Then in 2018 rebar rods were added and non shrink grout.