The Vault City downtown area is the second district of Vault City.
Here only Vault citizens and those with a Day pass may enter - however, the guards watch it, so they have to search through a person's inventory for chems and alcohol which are forbidden. Here one can trade for weapons (only for Citizens), general goods or medicine. There is also an library, but the books are being thrown away, as new technologies make them in digital form. Beside this, the Servant Allocation Center, Corrections Center and Tap House is also here.
Stark, the sergeant of Vault City thinks that they will have to fight Gecko's ghouls... so he will reward people if they scout around Gecko. Also, he needs someone to enter the New California Republic and get back to report.
The Vault City Downtown appears only in Fallout 2.