aansar

Hi i am in condo penthouse . Upstairs i dont have any living space, it is a just open-space.. The staircase are is quite tall (more than 600m). i just had a crazy idea to knock off the existing staircase and build one more floor and use the new compact swirl staircase (may be steel structure). note: i am not asking about constructing anything in the open area upstairs, i know it will modify the roof area.. so i am wondering, can i hack of staircase in condo? i dont know whether it is part of structure.. just thought of taking forum inputs before getting in to action. if it is not part of building structure, am i allowed to hack it? and construct one more floor in codo's ( i will be using aluminum structure) ... i know it will be a quite a hack.. waiting to hear your inputs. Regards shan