1.67 here.
so i found a glitch last night on Highrise. you can get on the other roof. but this time ontop of the whole building not just a little room like the other side. ok go to the opposite side of the building where you can get in the room ontop. if you look to the left there will be a vertically hanging platform where one of the wires is cut and its just hanging vertically. you can jump across and cling onto the side of it, it acts like a ladder climb up that follow the ledge of the wall to the next platform that acts like a ramp climb up and just across to the open ledge onto the roof.
or here is a video of how to do it, i went 1-20 the first time i tried to do it bc i kept slipping off LOL.
http://www.youtube.com/watch?v=K6D9dBmtFBI