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Could be part of the issue, plus in a converted house you generally know the people you're pissing off as they're the other half of the house you're in. Although I've been in a few low-rise, fairly modern, purpose built flats (5 stories or so) with pretty bad noise insulation.
Old LA ones seem to be the solidest built.
As a generalisation, houses converted into flats are shit for noise transfer. Purpose built flats in big blocks are pretty good, floors are solid concrete.