Have you found Quincy Sharp's hidden office in the Asylum yet?
Go to Arkham mansion and into Quincy's office.
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Place three charges of explosive gel at the wall and detonate them. It might take a few attempts but you'll make it.
What's inside there?
Spoiler
Nothing special :-D
Blueprints of Quincy's project to turn Gotham slums into Arkham City with an "APPROVED" stamp on it 8)
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Nice attention to details. It shows that both Quincy and Rocksteady were already planning to expand business :-X >:D