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There are two other possible explanations for settling at that corner. There had previously been a retaining wall 10' out from the foundation built of old railway ties that were anchored via a chain attached to a bolt set in the foundation wall below grade, but in line with the vertical crack seen in the photo. The retaining wall was pulled apart with a mechanical shovel, so there could have been a lot of tension on that chain (that no one knew was there). There other possibility is that granite boulders (from the neighbor's blasted out basement) were used to replace the retaining wall. They're all in a line parallel to the face of the foundation that you see in the photo, about 10' out. Except around that corner, they're a lot closer to the foundation - to within 2 to 3 feet. Perhaps the weight of the boulder around that corner caused some settling. This work was done about 3 years ago.
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