I'm not going to say too much.. as you should just see it in the pictures..
Just jump on top of these barrels.
Now jump on the entrance thing. You should all know this :P
[IMG=http://img92.imageshack.us/img92/5702/3dl0.th.jpg][/IMG]
1. First jump just to the thing that comes out of the building.. but jump against the roof. move a bit forward to Point 2.
Now you should be hanging in mid-air like me and jump jump on the thing. and you can walk on top of the roof
Just some thing lots of people asking me how I do it
Jump up.. and u should be in mid-air jump again and ur are on it
Maybe one of the moderators should translate it to more english.. if needed