|In order for this mission to become available, you need to have finished Up, Up and Away!, as well as Saint Mark's Bistro. If you didn't get the keycard yet from Millie, you need that as well.|
REWARDS - $100,000, Respect
It's time to rob Caligula's! Head up the street to Caligula's. Enter the front door without brandishing any weapons and do not cause any ruckus inside. You now have 4 minutes to get the team inside. Head to the staff door, then press Triangle to swipe your card. Head downstairs one level to the generator room. Gently toss a gas grenade into the ventilation shaft.
You should see a cinematic when you do it right. Follow the blip to the door and use the keycard again. Zero blows the charges you had on the dam and the lights go out. Put on your night vision goggles, then head to the next yellow blip. When you get to the service garage door, you'll need to find something heavy to help lift it. Get in the marked forklift and use it to open the door.
The van is backed into the garage and the timer disappears. Unfortunately, a new timer appears; you have 7 minutes to break into the vault, steal the cash and bring it back to the van. Stay ahead of the team and take down all of the security. Follow the team down into the vault area, then Zero will chime in saying that someone's trying to restore power using the backup generators.
Grab the satchel charges in the vault area, then head upstairs to the generator room. Go upstairs and take out the two guards, then place satchel charges on the generators and blow them up from a safe distance. Go back downstairs and the vault door is blasted open. Go inside, snag the snag the armor and Zero reports that Mafia henchmen are coming downstairs.
Gun them down while your team is stealing the money. Once all the henchmen are killed, it's time to head back to the van. Stay ahead of your team and kill the Mafia goons as you head back to the van. Once you get to the van area, your team takes off and the timer disppears.
Since you're the decoy, you'll need to head to the service elevator. Zero's arch enemy, Berkley, manages to restore power to the casino. Head to the yellow blip on the radar, gunning down the Mafia goons. Go into the red marker to ride the elevator to the top, then ascend the stairs to the roof.
Take care of the police chopper, since it will drop guys down to slow down your progress. You need to make your way across the roofs to the parachute. Jump over the first roof to find guards sitting there, so take them out and get the parachute on the next roof.
The cutscene shows a police chopper on a nearby roof. You can parachute over, kill the cops and use that to get to your safehouse. I didn't make it onto that roof, so use other means to get to your hideout. Once you get in the red marker, mission complete. $100000 and respect earned.