The seat of power within Konohagakure. Although it is called the Hokage Mansion, it serves as both the offices and the "official" dwelling place of the Hokage and village Sennin although they are free to live and work elsewhere. The circular mansion is by far the tallest building in the Emerald Isles and stands five stories tall.
These are the personal business rooms of the Kage and Sennin of Konohagakure. If you need to speak to any of them, the polite thing to do is to request a meeting with the receptionist and wait for them to have open time.