Bobbi said:
Nobody have any suggestions for me? I really need some guidance with this matter.
You need to get your head round the difference between common property and shared facilities. A common property storeroom is an area for which you share responsibility, not necessarily access, so drawing parallels with parking and gardens – shared facilities – is inappropriate.
However, if the store room isn't being used by anyone else, why not ask the OC if you can rent is for the duration at a cost that works for both parties. And onece you've done with it – and dropped some cash into OC coffer – others may make use of it too.