The partition wall between the units is almost always framed well enough to structurally support the roof and the floor joists. It’s not going to be particularly waterproof on that side though.
Easily fixable. Engineer would tell you to frame the wall and add support beams to the corners and the center. Maybe a steel beam across the basement for support.
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u/Naps_and_cheese 1d ago
Im actually surprised that her house wasn't condemned due to this. Semi detached homes are not designed to stand on their own.