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What year is it? With a car that's potentially 15 years old I think the years might be wearing it down more than the miles. I don't know how a bmw interior should hold up, but the merc w124 I had from '94 had very little signs of wear on the inside. Interior quality seems to be the same for w212's that I'm currently researching.
Can you take it to an bmw dealer / garage that you trust and have them look it over? That way a mechanic can spot anything out of the ordinary
That can't be much for a well looked after bmw. I don't know much about them, but for the equivalent merc it's nothing.
Unless it's all city driving and with a poor service history, but that goes for every car