The elevator in the building was designed to go up to the 100th floor, but only certain staff and the building owners had the access to this floor.
All guests who wish to go to the Sky Bar must exit on the 99th floor, enter the Moonshine Restaurant, and take the escalator on the left side of the building to the 100th floor.
The intention was so that penthouse residents would not feel disturbed by the hotel guests who may enter the area near the penthouse.
As a person who was very into privacy, Caspar designed this system so that his family would not be disturbed by hotel guests.
However, but for his more carefree and ignorant children, this arrangement was really annoying, because in order to get into the Sky Bar, they had to go down one floor first and enter through the restaurant, even though the penthouse and Sky Bar were actually located on the same floor and only separated by a tall wall.
I forgot to remind you that the second volume is set in future.
Aleksis was born in early October 2019 and this time it's already 2039, she is almost 20 and so the technology, lifestyle, etc from that year are different from what we know now.
I'm excited with the world building and did extensive research on how the world would be like, 20 years from now.