Pay some niggers to open all of the surrounding fire hydrants so theres no water pressure for the sprinkers, set few offices on fire on multiple floors, then pull the big old fire alarm button. Theyll have to clear the building because its not just a hoax. Considerable damage will be done due to multiple floor fires with no sprinklers so they cant just open right back up.
Then Wait for the dancing isralies to show up, take them out, and mail their heads to osama bin laden so hell have heads and proof that he stopped the attacks.