This is the Mansion in which the Metarukage resides. It is unlike others because it is more of an estate then a building. It looks like a Buddhist temple in style. The gate looks like this.

If you go left 10m from the gate you'll see a a hut, which is the mission center. Across from that on the other side of the walkway is the armory. If you go down the walkway straight from the gate is a giant Building. This contains numerous room's including the Library, Kage Office, The Kage's wing(where he lives, bedroom, bathroom, entertainment room) and Official meeting room.

On the building is the Kanji for metal. All the roofs of the building are trimmed with steel.