I can show him a building several blocks from my office where oxide jacking at the lintels is lifting the entire second and third stories of a half-block long Chicago structural masonry 1920's apartment building converted to condos up and out - it's costing the association around a three quarters of a million dollars to stabilize and repair. Extreme case admittedly, but the only obvious indication at the exterior was "cracks above the lintels of square windows"....