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Id look into it and try to find a solution before you move in. Often when that stuff is put up in a domestic setting because at the time it was seen as a cheap way of hiding a big mess.
Have you had the surveyors round to the place yet? If not just ask them to assess it when they do go. If they have been ask them if the had a look up there I'd expect any decent surveyor to be curious as to why it's there even if it's not in the report.
Bobbo-
It's a housing cooperative in Denmark. Having surveyors around would be very unusual. Usually you just have a sparky and a plumber look at the absolute basic stuff and then a 'valuar' to give an estimate of the value of whatever improvements have been made. But a large amount of drop ceilings in Danish apartments aren't made up to code. @Lolo will have two weeks after moving in to get it looked af and then he can claim money back from the seller as the board of the housing cooperative will withhold a large part of the cost of the apartment for around a month.
JesperXT
Thanks for the input. Once we move in I'll have a proper look.