Attic Space

Hi,

I could really use some advice.

Earlier this year I purchased a apartment in a block in 6, the apartment was at some point a house that was then converted into 6 units back in the 70s or 80s. The block is self managed and the record are not great. My unit is on the top floor and has access to the attic space above my unit (no other access to it) which the previous owner used for storage and I have been using for storage too, the access is had from a pull down staircase. There has been some modifications done to the unit at some point I am assuming because there are sky lights coming through the attic into the the living room and kitchen.

My question is who own this space? I would love to renovate it to make it habitable, but it does not show up in any records I could see, so i am not sure if it is just common property, exclusive use common property or is it my property?

Any help would be greatly appreciated.

Thanks.