Is there a limit to how high we can build a skyscraper building?
user
Well, the roof of the Burj Khalifa is 828 meters high, so we could build a skyscraper that's even taller.
assistant
Why did the people who built the Burj Khalifa stop at the height they did?
user
It would cost too much to build taller, but there is no law that says a skyscraper can't be even taller.
assistant
Is there a limit to how high we can build a skyscraper building?
user
Well, the roof of the Burj Khalifa is 828 meters high, so we could build a skyscraper that's even taller.
assistant
Why did the people who built the Burj Khalifa stop at the height they did?
user
That's a great question!  I actually don't know the full story, but here's what I know:  The Burj Khalifa (the "Khalifa Tower" in Arabic) was originally meant to be just a tower with an observation deck on the top.  But later, architects decided that it should also be a hotel.  So that meant that the building needed to be taller to have enough space for a hotel.  And the upper floors are actually apartments for wealthy people who like the view from the top.
assistant
Is there a limit to how high we can build a skyscraper building?