I'm no expert but even I've read that "Works at the White House" goes much further than the executive residence and oval office, including the West Wing and the big office building that's directly connected to it by basement walkways.

I asked Gemini if my recollection was correct and got: "The EOP network (managed by the EOP Office of Administration in coordination with Presidential Information Technology Community entities like the White House Communications Agency) operates as a single campus enterprise network. Its high-speed backbone links the West Wing, the EEOB, the East Wing, and nearby administrative facilities such as the New Executive Office Building (NEOB) on 17th Street."