Sorry the pics are so dark.  Tried to lighten up the first one a little.
*Drop out the window and push (arrow keys or whatever) against the building as you fall.
It's see-thru because they didn't put textures in there.  That means they had no intention of people going in there in the first place.
 
 
Just toss a grenade in there to kill the sneaky bastard!!!
 
