yeh it would mean scrapping the whole exterior scenes which i don't want to do. there's also another issue when you see the corridor view that is outside the door that Lando & Chewie enters
as you can see there is another apartment entrance next to leias and the window she is looking out of would actually be looking into the next door apartment. What a mess. i hate continuity issues...lol
Man, I almost simulposted that too! So they walk up a few stairs into the hallway, walk along towards the camera, turn to their right, walk down some stairs past Han's corridor, go down a corridor and turn left, past the elevator window, go down some more stairs and meet up with Vader. There are a lot of stairs. And Han's corridor has stairs going down into it (meaning that since Lando walked down stairs before he walked past it, there should have been more stairs on his side, or no stairs on Han's).
There is a lot of building around the apartment, not at all like a tower as the mattes show.
EDIT: And what kind of apartment only has one open room? Maybe its more like a lobby? And I don't want to point out that Han and Lando switched sides sometime while they were walking.