Hotel Zanzibar
From Halopedia, the Halo wiki
Hotel Zanzibar was operated by human civilians in Old Mombasa on Earth. Only the first floor of the facility is ever observed, but it appears to be a run down facility. This, however, could be due to the battle raging around it at the time.
In 2552, during The First Battle of Earth, the Hotel Zanzibar was abandoned, along with the rest of the city. When the UNSC In Amber Clad dispatched Pelicans full of relief troops for the massive battle going on inside the city, one of those Pelicans was shot down by a Scarab near the hotel. The Marines who survived the crash set up a command post inside the hotel lobby. They were surrounded and almost overwhelmed by Covenant ground forces when Spartan 117 arrived and aided the surviving Marines, eventually leading them into New Mombasa[1].
The attack on the hotel was led by an Ultra Elite (Heroic and Legendary difficulties only). He almost never appears on the Normal and Easy difficulties, he is replaced with a Major Elite.
The only place the player sees is the first floor. It consists of a lobby, a desk ( presumably the front desk), a small room behind it, a waiting area to the left ( that has a soda machine), and then several rooms leading back toward an open area, presumably part of the hotel that was nearly completely destroyed.
