Can you see rockefeller centre n tree from any part of the observatory deck? Or is it the view of central park?

You can't see the tree. You can see central park.

You cannot lean far enough over the edge to see the tree

Mostly a view of the Central Park and lower Manhattan.

Top of the rock is the top of Rockefeller center. You can't see the tree, because you can't look straight down. Central Park you can see