The outside looks like a warehouse type building. Definitely a good theme for BH since that's how the base has been ever since it came to existence. What the hell is with the 1000 hp door on the roof? That's stupid. The garage door is 500 hp but the door right above it is 1000 hp. That makes no sense.
Monty pretty much explained what I would say about the main floor. Sliding wooden doors? Bonsai trees? Wine bottles? Wine cabinets? Fancy lights and wall paper? Seriously now.
The elevator is stupid. Wood flooring with an ugly carpet pattern that looks like "8H" since what supposedly is a "B" looks like an eight. I also find it interesting how there's tables, chairs, and a couch inside the elevator. All it does is get in the way especially during a raid. What were they thinking?!
I also find it funny how there's a bar and bartender on pretty much every floor. No clue what they were trying to do here. Why do bases have to be so fancy like this?