I was wandering around the tower when i convieniently landed on a level of the tower where i was suprised to find a secret area labeled as the HQ. I havent seen anyone talking about this HQ so i decided to make this guide.
The way you reach this location is by flying / falling through the tower interior levels (11th level from the top) untill you see that one of the doors are missing and the glass is transparent, when you've landed on the right floor walk through the missing door and then through the metal framed door and into the clean looking office known as the HQ.
Images of HQ
Lunch Room (With EatMoreCookies)