Vault-Tec Headquarters

The Vault-Tec Headquarters building is located in the Vernon Square area of the Washington, D.C. ruins.

Building history
This was Vault-Tec's base of operations around the DC area. From this location (specifically, by accessing the Vault-Tec mainframe), you can learn the locations of Vaults 87, 92, 101, 106, and 108.

To access to the mainframe requires authorization from all three System Operation terminals. Station 3 is on the first floor of the Administration Room, terminals 1 and 2 are upstairs of the facility.

Enemies
Resistance inside the building consists of security robots and turrets; the models inside are regular protectrons, sentry bots, robobrains, Mister Gutsies, and one special model of the robobrain - the Masterbrain - on the same floor as the mainframe. You can turn off the Masterbrain and all other security robots in the Vault-Tec Headquarters by using the correct command on the three employee terminals in the mainframe area. Alternatively, you can destroy Masterbrain and use it to shut off all other security robots. *Note: Electing to shut down the security system not only disables the defense systems, but also effectively locks and seals the mainframe door permanently, requiring you to load a previously saved game to gain access!

Super mutants have been encountered fighting the robots in the Guest Relations area. It seems they have been using the Vault-Tec Headquarters as a massing point, as gore bags, which are a common find within super mutant bases, are located in the Guest Relations men's restrooms.

Guest Relations

 * A Tales of a Junktown Jerky Vendor book on a table up the broken stairs on the right side of the room, in the cafeteria area. It is meant to only be accessible when you go down from Administrations again. However, with some tricky jumping it can also be reached if you jump from the highest point of the broken staircase.
 * In this same area above the entrance on the tables around the Tales of a Junktown Jerky Vendor book, are two more Vault-Tec lunchboxes.

Corporate Offices

 * One Nuka-Cola Quantum is located in the most Northwestern room on the second floor, It is on the bottom shelf of a bookcase. There's a door covering a hole in the floor in this room.
 * A Big Book of Science in the room directly east of, and connected to, the room containing the Nuka-Cola Quantum on the second floor. The room with the book should have almost no floor. When you stand looking into the room and look straight ahead at the opposite wall, you will see two bookshelves slightly off to the right on the eastern wall. The Big Book of Science is on the top one. It's very difficult to see, and the easiest way to obtain it may be to shoot it down. You can also jump onto the fridge in the room's northeast, then walk off against the wall with the shelves. You'll be able to stay on the edge, and when you get under the shelf, look up. The corner of the book should be visible for you to grab it. Alternately, you can edge close to that shelf and jump, rapidly pressing activate.
 * Stealth Boy; northwest corner, top floor, in a storage closet just above the room with a random loot safe that also sometimes contains a Stealth Boy. (You have to walk around the edge of the missing floor to get to the closet.)
 * A pre-War book on top of a garbage can next to aforementioned safe.

Administration

 * An issue of Grognak the Barbarian on a curved desk in a private office. The room is at the very west of the area.
 * 7 Vault-Tec lunch boxes are located in a closet in the most northeast room.

Related quests

 * Agatha's Song: The Vault locations retrieved here help with the optional portion of the quest.

Appearances
The Vault-Tec Headquarters only appears in Fallout 3.

Bugs

 * It is entirely possible that once you've killed the Masterbrain, and attempted to shut down all other robots, that all other robots and turrets will remain active and hostile.
 * It is possible to get double XP by destroying all robots then by using Masterbrain to shut everything down, on your way back/out all the robots you killed will have 1 bar of HP. Shoot them again and you will get the XP again.
 * It is extremely likely (if you have already finished Agatha's quest) that the door which leads to the mainframe can't be opened, even if you manage to get the right authorization from all three System Operation terminals. The mainframe terminal can still be accessed by entering the first floor of the mainframe room and jumping on to the pipe coming out of the wall in the south east corner of the room. From there you can jump onto the computer on the south wall. Then, looking up at the terminal overhead, jump and access the terminal while you are in the air. Alternatively, the door can be opened with the "unlock"-command when selected in the console.
 * If you open the cell gate to the locked door ( key required ) and close it while using the Masterbrain, it sometimes will glitch so you can walk through it without opening it.

Штаб-квартира Волт-Тек Vault-Tec-Hauptquartier Sede de Vault-Tec Vault-Tec Headquarters