The office building (or Department of Research Subsidies) is a building on Washington Boulevard within Falls Church, in 2277. The location is marked on the local map as "Office Building," and shares the same name as another one in the same area.
There is a main entrance (on Washington Boulevard) and a secondary entrance (across from the children's playground). Both of these entrances lead to stairs that lead to the first floor which is accessible and populated with various offices and a restroom.
In the offices, there are the corpses of two Brotherhood of Steel initiates and super mutants. In this same office, there is a functional terminal, which contains the last thoughts of government worker Elise Walton.
In the restroom, there is a rigged shotgun.
This office building appears only in Fallout 3.