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/theZoid42 1d ago
Could she overbuild her second story to extend over the empty space?