Looks like a fledgling pigeon to my eye.

A peregrine falcon would have a similar body shape, but with a shorter more curved beak. Peregrines also have yellow legs with more pronounced talons.

Pigeon, I agree. Raptor beaks are a lot more curved and pointy, and look more like a meat hook. He probably can't fly, the pinions don't look developed enough for it yet - young birds like this will often fall out of/leave the nest but still be fed and cared for by their parents on the ground for weeks until they're old enough to hunt for food on their own, especially when they get to this size.

I think that you've got a pigeon.