It's just plain big...

Burj Dubaialready has 79 stories, taking its height to more than 200 meters (656 feet). But even after having gone that far, Emaar is still not revealing the tower's final height.

"At the moment, we are not answering. We'll say it (will be) more than 700 meters (2,296 feet) and more than 160 stories ... The people who need to know, know," Sang, a 40-year-old New Zealander, told AFP.

The world's tallest inhabited building is "Taipei 101" in Taiwan, which is 508 meters (1,666 feet) tall.