What you are seeing here is the Escape Rescue System, and it is something that you would use to quickly evacuate people from a high building.
It is also capable for when you need to get several people inside a high building covertly. You can watch a video of it in action after the jump and see a scene of terrorism that looks like it is right out of 24.
As you can see, this Escape Rescue System can attach to the side of a tall building from the room, and this elevator car can expand into five levels of elevator car. Then this five level car is lowered, and SWAT teams can enter in five windows on five different floors, or one team at a time at one window.
It also comes in handy when evacuating people. Just put this thing at five windows, and let the civilians climb in. Hopefully, you can lower this thing down quickly if you need to make another run.
I’m not certain if there is actual working model of this Escape Route System somewhere, as this video looks like more of a proof of concept than anything else.
I can easily imagine every high building having one of these, but I would never want to use it.