Question remains: Do we need to kill 20 people in there? From what I see on the map, you guys are the closest to the VIP room of all people in the building. Those VIP rooms always have soundproofing and one-way windows, so the guys on the dancefloor won't notice if a bunch of you open the door, take out the guards and grab the package...
As for what Cute Murderous Girl suggested: Selling 20 bodies.
Yeah, C Joe and Tanamous have close ties, no doubt. But that doesn't mean he'll like us arriving there and saying "Here's the package you ordered. Oh, and here's 20 bodies, killed in a crime scene right across the street where KE will start an investigation about 5 minutes from now."
The guy runs a clinic, not a butchery. He sells the end-product, doesn't mean he deals with the raw materials. Even animals don't shit where they eat.
-- Going to give the rest some time to voice their opinions about this, while Silk & Noise take out the guys in the North.
Noise's Infiltration:
Silk's White Noise Generator's got you covered too.
Chrona: I'm guessing there isn't too much noise in the hallway because of the soundproofing. If there is, Silk's not turning on her White Noise generator. Everything suddenly going quiet will be a lot more noticeable instead of "stealthy".