I have not read the Lotus Sutra, but I've read quotes of it.
The Treasure tower is, apparently "five hundred yojanas in height and two hundred and fifty yojanas in width and depth" (chapter 11), equivalent to half the diameter of the earth, and Mt Meru (Sumeru) is a hundred yojanas. This means that the Treasure tower is five times the height of Mt Meru.
Now since the Treasure tower is five times higher than Mt Meru, how far does the tower reach into the realms above? The Desire realm does not reach outside of Mt Meru (hundred yojanas), does it?
What is the meaning of its height, other than being just a number? Is the entrance to the tower (where the Many Treasures Buddha is) in a specific realm, or is the peak of the tower in a specific realm? Or both?
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translation by Burton Watson
http://www.fodian.net/world/262_11.html
add: obviously it mentions that it is so high that it reaches "to the heavenly places of the Four Heavenly Kings".


Excellent, Astus!