Howdy anneke! This is such fascinating information and I was surprised that the number of floors was stated as 103 because 102 is always the official number.

The 102nd floor is the observation deck and people think that is the top floor but the 103rd floor is actually a secret floor accessed by a hidden staircase and leads to the "capsule" and is not accessible to the public. It has a balcony with a very low rail!