[Mother Nuru.]

As far as im aware abandoned office (If im thinking right, it's the large map with the office in the middle) Has no invisible ledge, just rather the outskirts of the fences. Nothing like that is illegal due to being easily seen. There's not many spots on abandoned office that are illegal because it's a pretty basic map with not a lot of props on it to begin with that are easily hid into mesh wise or etc. So this should be fine. If you can get a screenshot that would help better.