The CTBUH recognizes tall building height in three categories:
1. Height to Architectural Top
2. Highest Occupied Floor
3. Height to Tip
However, they use the #1 definition to calculate their 100 tallest buildings. But apparently they recognize all 3.
They do, however, also publish the
Absolute vanity height list which is the "Absolute difference between the architectural height and highest floor in meters." and the
Relative vanity height list which is the "Vanity height (ie. the difference between the architectural height and highest floor) as a precentage of the architectural height in meters."