No conspiracy, just sounds like the Treasury has money to burn. And why wouldn’t they, they print the stuff after all.
I headed security at the Office of the Comptroller of the Currency when they were finishing up their new building at 500 C street in DC (1991).
The head guy's office on the top (9th) floor was huge, had it's own balcony, sauna, bathroom (full with jacuzzi), and kitchen.