Answer:
What building has the most stories?
I'm a green veggie that looks like a tiny tree.
Tall, I am young. Old, I am short. With life I glow. Anemoi is my foe.
I'm a god. I'm a planet. I measure heat.
I am not alive, though I never die, to no one I've ever told a lie, today I can be god's warrior, and serve him with no horror, but tomorrow I might be devil's knight, for I am what ends the light.
I am a rock group with four members. All dead one was assassinated.