Answer:
I fly when I'm on and float coming off.
What building has the most stories?
I contain five little items of an everyday sort. You can find all five in a tennis court.
Lovely and round I shine with pale light grown in the darkness a lady's delight.
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.