 Despite the renamings by the University and the American military administration , the building is still usually called the IG Farben Building by the general public . The association of the building with Nazism has been hard to shake off , partly because of the close involvement of IG Farben with the Nazi regime and partly because of the building 's imposing and monumental appearance . Der Spiegel wrote of its " Smell of Guilt " . Only with the departure of the Americans , the subsequent renovations , and the use of the building by the university has the building 's association with the Third Reich in the popular consciousness receded . As of 2010 , the building is referred to as IG Farben Hochhaus on the campus map . 
