The I.G. Farben Building – also known as the Poelzig Building and the Abrams Building, formerly informally called The Pentagon of Europe – is a building complex in Frankfurt, Germany, which currently serves as the main structure of the Westend Campus of the University of Frankfurt. Construction began in 1928 and was complete in 1930 as the corporate headquarters of the I.G. Farben conglomerate, then the world's largest chemical company and the world's fourth-largest company overall.