Well, it appears to be booted and doesn't have a big enough mouth for a Ferrug, so I'm gonna say Golden. However, I've never seen a Golden so young and there are lots of exotic raptors that I know nothing about, so... don't rely on my guess.
Its plumage reminds me of a juvenile white bellied sea eagle, but I would think they would be a bit larger than what you describe this bird as. This is a tough one.