Thanks a lot for the respond Aero,are you suggesting that i put each story of the building on a different level? because right now everything is inside one level,actually i myself had a theory that i haven't tried yet mainly due to skepticism and not knowing how something like that can be done;and that's having each story…
I would say your best bet would be to use a scripted texture to switch between level maps when you switch which level is currently being streamed, here's a bunch of articles on ScaleForm you might find your solution within these articles: http://forums.epicgames.com/threads/743567-Getting-Started-with-Scaleform-amp-UDK…