what happens when you neighbor builds a new retaining wall and disconnects your old garage wall?  You call an expert to fix it.  The new wall stub is attached to the slab at 2 points, to the concrete wall behind at 6 points, and scribed perfectly to the new un-even rock face.  Gaps are packed from the back with Roxul to avoid any mold or air infiltration.  Here’s to another 100 years.