I'm guessing this may be a juvenile Square-tailed Kite or maybe a juvenile Little Eagle. Take near Hornsby N.S.W.
DSCN9156a.JPG
DSCN9159a.JPG
DSCN9162a.JPG
These photos were taken by my brother and posted with his permission. (hope that's OK).
He and some neighbors just can't figure the ID.
Cheers.