sentences:  Most of his work would be done in the West, and the Beacon post office was the only federal building he designed in New York, and a rare small building at a time when Underwood had been doing primarily large ones like the lodges and what is today the Harry S Truman Building in Washington.Inside, Charles Rosen, who had been awarded the commission by the Treasury's Relief Arts Project (TRAP), painted the mural, one of 15 public artworks that program, which unlike the department's larger Fine Arts Section did not rely on competitions to select artists, sponsored in post offices around New York.In addition to the large map of the Hudson Valley, Rosen and his assistant Clarence Bolton painted small landscapes of the area with titles like "View of Beacon from the River, The Old Power House and Waterfall", and "The Old Swedish Church".