Where in Arkham Asylum are the plans for Arkham City?
Solution 1:
The plans are in the back of Quincy Sharp's office. GameInformer has a video walkthrough describing how to see the plans for yourself.
Solution 2:
It's in Quincey Sharp's Office, when you walk in. Go to the left and go to the wall. You need to use all three Explosive Gels to knock it down