The Peer Gynt Hotel.
Establishment in Washington where a big awards luncheon is being held.
Among the celebrities attending are producer-director Otto Hurrah (who is seen carrying his trophy) and actor Russell Bediyoskin.
The latter anonymously meets with Maxwell Smart in the hotel's revolving door but is shot before he can reveal vital information.
After the shooting, Agent 99 is kidnapped while searching Bediyoskin's room, #415, and is held prisoner in the next room, #414, where she is guarded by a Henry Frack until rescued by Max and the Chief.
The hotel is also noteworthy for having a woman doctor, a relative rarity at the time.
It is presumably named for the eponymous play by Henrik Ibsen.
[Episode #58: "A Man Called Smart, Part 1" and Episode #59: "A Man Called Smart, Part 2."]