Vault 21

Vault 21 is a Vault-Tec vault, converted into a hotel/casino

Background
Located in downtown Las Vegas, Nevada, Vault 21 was one of the few Vaults that successfully protected its inhabitants while fulfilling the parameters of its experiment. Everyone in the Vault was equal, it was created with a perfectly symmetrical layout, and all conflicts and problems were solved through gambling. Chosen representatives gambled against each other in the main atrium and the winner earned the right to settle the dispute as wished by the collective. Sarah describes it as "pure New Vegas" as "everyone has a chance and lady luck smiles if you play your odds right."

Mr. House contacted Vault 21's residents with an offer of inclusion in the resurrection of Vegas. While most of the Vault dwellers wanted to refuse the offer, some residents were in favor of it. As a result, residents in favor of Mr. House's offer challenged each level's representative who was in favor of staying isolated. After a game of Blackjack that lasted for many hours, those in favor of opening to the outside won in an extremely risky move. Soon after, Mr. House ordered the Vault to be filled with concrete. But at the request of Sarah and Sheldon Weintraub, he left some of the upper levels intact and allowed Sarah to establish a hotel there, which became another source of income for Vegas's growing economy. After their emergence, many of the Vault dwellers went on to live new lives in the outside world, such as Doc Mitchell.

Layout
A Vault door sign advertises the hotel, on the western end of the Strip, "Vault 21" emblazoned with neon lights. The Vault entrance is an above-ground building that opens to a lobby serving as a gift shop. It is run by one of the only Vault residents to have remained, Sarah Weintraub, who runs the establishment and utilizes a terminal network to communicate with patrons. Stairs lead from the gift shop down into the Vault.

There is a central atrium with two Blackjack tables, a hallway with living quarters, including Sarah's room and a guest room that the player character can rent. Another door leads to the cafeteria/diner. The lower levels were filled with concrete by Mr. House and are inaccessible except for the maintenance level, which is accessible from the basement of The Tops. This level consists of a long hallway with a few small rooms branching off of it. The elevator in Benny's suite leading to it is locked unless he is attacked in the Tops presidential suite, and the tunnel ends in another locked door.

Inhabitants

 * Carlitos
 * Martina Groesbeck
 * Michael Angelo (formerly)
 * Doc Mitchell (formerly)
 * Ollie
 * Sarah Weintraub

Loot

 * The Strip snow globe - Behind an Average locked door in the northeast-most room (Sarah's room). In the same room, there is a Hard locked dresser beside the bed with 270 caps and several articles of clothing.
 * An oversized toy car and a sensor module - In the hotel lobby.
 * Strip letter 1 and Strip letter 2 - In the guest rooms to the southeast.
 * Strip letter 3 - In the guest room just west of the inaccessible door to the south.
 * Vault lab uniform - Occasionally sold by Sarah.

Related quests

 * Bye Bye Love
 * The Finger of Suspicion
 * Suits You, Sarah
 * Tourist Traipse

Appearances
Vault 21 appears in Fallout: New Vegas, and is mentioned in its add-on Dead Money.

Behind the scenes

 * Vault 21 was designed by James Garcia created the 3D model of the neon sign letters.
 * Josh Sawyer stated that House cemented the Vault to avoid former residents from retaking it, keeping it limited to a tourist attraction and small-scale residence.

Bugs

 * If you take the tour with Sarah Weintraub, your companions may disappear and not reappear when you exit the Vault.
 * Sarah may not recognize Vault 21 jumpsuits as Vault gear, but will trade for them normally at the usual price.
 * Sometimes when you take the tour with Sarah Weintraub, she will walk with you out of the gift shop and then stay still above the stairs leading to the hotel part of Vault 21 and will be unable to talk to.
 * Vault 21 has a high probability of causing the game to freeze during loading screens.