I'm confused by WHAT is taller. Is the office building portion taller, or just the "tower" part?
I understand the 'need' to make it taller - an attitude of "you can't defeat us, we'll just rebuild it taller than ever". But I also don't think a lot of tenents will be jumping at the chance to rent office space way up high in these buildings.
But, on the other hand, if the office buildings are actually shorter and the sprial 'tower' thing is what is so tall, that I can totally understand. My co-workers think this is the case, but neither article fully explains it.