Once you've taken the guard out silently, turn around and go down the hallway. Here, another guard will be patrolling, wait for him to turn back around, as soon as he turns back around, go to the room where your NOOSE outfits are. You will be able to see the clothes icon on your minimap. It will be the third door down the hallway. The other NOOSE outfit will be in the room next to this one, and your friend can get it from there. Once you have the outfits, exit out of the building through the STAFF LOBBY exit door. No guard will attack you now.
Heist Mechanic Updates
Since the time this guide was originally published there has been a small tweak where the route which you would usually take is now blocked. The exact location of the blockade is at the door which you take on your right after reaching the top of the stairs after exiting the basement. A straightforward workaround is to wait for the guard to come by, immediately leave the staircase section, and take the guard out silently.
Usually, we would wait for this guard to walk back the way he came from and then proceed to walk towards the door to the right. But now the door is blocked by a cleaning stand. After taking out the guard, just walk around the elevator and to the door on the right side. Be careful of the camera, which is on the other side. Hug the wall and stay clear of the cone of visions of these security cams.
Go through the door and this time, you will be able to head towards the corridor, which leads to the staff lobby. Before heading out stay clear of the door as it has a small glass window, and the guards can see you through it. There will be a guard coming towards you, and it is the same guard who you take out after going through the door in the original route.
Wait for the guard to turn around, quickly go ahead and silently take him out before he reaches the turn at the end of the corridor. If you miss, then head back inside and wait for the guard to come back.
Now, wait around the corner until the second guard turns around and rush towards the laundry room to get your N.O.O.S.E outfits. After this, you can proceed as normal.
The original route is still sometimes doable, but you should expect this updated route the majority of the time.
Once you've exited the casino through staff lobby, there's a couple of other new changes outside as well.
You will now find another N.O.O.S.E van at the end of the right side of the race track with two N.O.O.S.E agents. Not only that, but there will be a number of agents all across the race track. It shouldn't be an issue for you since you will be wearing the N.O.O.S.E outfit, but they will catch on to you as soon as you reach the lower end of the right side of the race track. So, be quick about it!
This is an important change for those who do not have N.O.O.S.E outfits as their exit disguise. In case you have something different, just hug the railing to the right side of the race track and keep running towards the end. Doing this, for some reason, renders you undetectable by the cones of vision of these N.O.O.S.E agents. After exiting the casino premises, proceed as normal.
Once you're outside, quickly rush to the race track course from the staff lobby exit and stay on the right hand side of the track. Keep running until you come across a small descent to the right (at the end of the right side). After that jump over the fence and head outside. Please note that once you're outside the casino premises, the cops will recognize you and you'll have a 5 star wanted level, so be quick about this! Once you've jumped over the fence, quickly grab any pedestrian car and head into the sewer tunnel which is right beside the road.
Once inside the tunnel keep driving until you're roughly in the middle of it and wait for your wanted level to go away. Once the wanted level is gone, keep driving until you come out of the other end and continue to drive to your buyer.
In the image above, the red path is the highway which leads to high level buyers. Do not take that path or else you will get a 5 star wanted level again. Always take a detour around the other side. Set your own location marker if need be, since the yellow marker to the high level buyers will generally lead you directly through the highway next to the casino, which will again cause you to have 5 star wanted level.
Now just go to your buyer and after reaching them, you have successfully completed your casino heist!
