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The process is simple enough, you climb to the topmost balcony of allcom, then glide down towards wfyo!
Keep gliding as if you wanted to reach the building itself (you cant lol) and once you are on the level with its floor... break the glide and hold it! (by holding the crouch button while and after qturning, it will prevent you from falling down as long as you keep holding the crouch key, but you cant move either)
Then let go, and grab the magrope!
If you dont see the magrope popup, it means you are too high up and/or not far enough