Floor 496: a1's void floor.
A floor containing the archives of Mr. a1. Anything he's used once in his life are stored here, hidden away from the light.
All of his recorded dreams are in here too, but is kept locked behind a vault. Some make it out though with the approval of Mr. a1 himself.
The maid that serves this floor bears the appearance of a1, but in an effeminate form. No one can quite describe her appearance as when they try to, the words escape from their mind. The maid also keeps the key, as well as the necessary passcodes, to unlock the vault. She's given free will in how to hide such a high security key so long as it's with her at all times, leaving visitors to wonder where she's hidden it as nothing from her immediate appearance and her uniform show that she has it.