IG Farben Building

The IG Farben Building or the Poelzig Building was built from 1928 to 1930 as the corporate headquarters of the IG Farben conglomerate in Frankfurt am Main, Germany. It is also known as the Poelzig Ensemble or Poelzig Complex, and previously as the IG Farben Complex, and the General Creighton W. Abrams Building. The building's original design was the subject of a competition which was eventually won by the architect Hans Poelzig.

On its completion, the complex was the largest office building in Europe and remained so until the 1950s. The IG Farben Building's six square wings retain a modern, spare elegance, despite its mammoth size. It is also notable for its paternoster elevators.

The building was the headquarters for research projects relating to the development of Nazi wartime synthetic oil and rubber, and the production administration of magnesium, lubricating oil, explosives, methanol, and Zyklon B, the lethal gas used in concentration camps. After WWII, the IG Farben Building served as the headquarters for the Supreme Allied Command and from 1949 to 1952 the High Commissioner for Germany (HICOG). It became the principal location for implementing the Marshall Plan, which largely financed the post-war reconstruction of Europe. The state apparatus of the Federal German Government was devised there. The IG Farben Building served as the headquarters for the US Army's V Corps and the Northern Area Command (NACOM) until 1995. The US Army renamed the building the General Creighton W. Abrams Building in 1975.

The US Army returned control of the IG Farben Building to the German government in 1995. It was purchased on behalf of the University of Frankfurt by the state of Hesse, which committed €25 million to the restoration. In recognition of the original architect, the University renamed the main building the Poelzig Building (Poelzig-Bau) and its ancillary buildings and surroundings the Poelzig Complex (Poelzig Ensemble). The restoration work started in March 1998, and the formal reopening as the Poelzig-Bau was celebrated on October 26, 2001. During the ceremony a plaque was unveiled at the building's entrance to commemorate the slave labour victims of the IG Farben factory at Auschwitz III and all those murdered by Zyklon B gas.