You start at the griffon master in Stormwind:
Walk beside the wall and jump:
Jump up the wall:
Try to get on the tower:
Jump down carefuly on the small wall beside the tower...
Go to the marked place and jump down(turn your camera if u are not sure)
Done:
Walk here to get under SW:
It also works with a Speedpotion, not sure if u can reach it with a nonrogue class..