basement level also contains the UN's post office and a studio for educational films. The second basement level contains lockers for maintenance workers and a room for printing and collating documents. The third basement level includes a small firehouse for the UN headquarters and a furnace room, as well as a document distribution room in the third basement. One of the basement levels contains the radio department of United Nations Department of Public Information. Tunnels from the basements lead south to the library and north to the General Assembly Building. The building's lobby contains black-and-white terrazzo floors, as well as columns covered with green Italian marble. There are full-height windows within the lobby. In addition, the lobby contains Peace, a stained glass window by Marc Chagall, dedicated in memory of Hammarskjöld in 1964. When the building was constructed, the lowest stories were to contain broadcasting studios, press offices, staff rooms, and other functions. Media correspondents for the United Nations occupied floors 2 to 4. There was a meditation space on floor 2 that doubled as a press conference room. In addition, there was a bank branch on floor 4. The fourth and fifth floors were connected by an open stairway. Floor 5 contained employee amenities, including a health clinic and a passageway to a staff dining room above the adjacent Conference Building. The dining room was originally supposed to be an open-air terrace facing the East River, but it was partially enclosed due to pollution from a nearby power plant. The dining room frequently hosted parties and receptions for UN staff before being converted into offices in 1981. Floor 7 contained a large telephone switchboard for the UN's Information Office. The switchboard, installed by the New York Telephone Company, was originally designed to accommodate 3,000 lines, though it could be expanded to as many as 8,000 lines. Offices The offices were placed on the upper floors. Each office story has a gross floor area of . There were private offices on the perimeter of each floor. Secretarial offices, support staff, and elevator cores were clustered in the middle of each story. Low-level officials worked on the shallower western side of the building, while high-level officials worked on the eastern side. This was done for two reasons: the eastern side of the building was more desirable because it faced the East River, and higher-level diplomats needed space for secretaries, filing cabinets,