Maybe they freeze the low side to allow the differential settlement to balance back out. I don’t think freezing is that challenging or expensive (on the scale o

Maybe they freeze the low side to allow the differential settlement to balance back out. I don’t think freezing is that challenging or expensive (on the scale of costs they are having to consider here) and would take weeks to thaw out. Also, the freezing need not be super deep or expansive, just at along original foundation pile to give them more “grab” in poor conditions. Freezing could be used as part of a perm fix too. I bet there’s a way to sequentially freeze subsoils in such a way to use frost heave to actually push the building back into original position to augment the foundation. Or create a frozen layer in the mid-foundation and then pump in high pressure concrete grout below the frozen layer. Freezing water is a powerful thing… Armchair civil engineering is fun