Dubai is no stranger to world records, in fact it appears that Dubai wants to be the destination for all of the world's structural records.  The title of world's tallest is never an easy title to own.  Competing building projects are always watching and attempting to go higher.  Just like the Burj Khalifa the official height of that building was kept as secret as the Coca-Cola recipe until it was nearly complete.   And, if you do become the world's tallest then it is only a matter of time before the next project comes along and out does you.  For example, see what's happening now in the arena for tallest wood building.  As Dubai has done in the past with the Burj Khalifa, they did not look to build a new high rise that was just a few feet taller than the last one, they looked to build the tallest possible building at the time. That put the Burj about 320 meters taller than any other skyscraper, and their newest attraction, The Dubai Eye, will be no different.