the well-contained development Mayor Franz Adickes had the Alleenring built at the beginning of the twentieth century, which at the same time bound all the new boroughs of the city together. The northern borough was less densely built-up due primarily to the generously laid borders of the Grüneburgpark. In 1930 Hans Poelzig erected the IG Farben Building. Until the Second World War nothing else changed much. In the Third Reich the borough was abolished and the Westend became part of Frankfurt-Nord. Police station nine in Lindenstraße 27 was the center of the Frankfurt Gestapo. The Westend was spared from carpet bombing during the airraids of the second world war. Initially, after the war almost the whole Westend-Nord (from Wolfgangstraße) was declared a restricted zone. The American military set up their headquarters in the I.G. Farben building. Surrounding boroughs were converted into housing estates for GIs. In 1948 barbed wire was removed from the restricted zones. Skyscrapers and street riots In the 1950s the Westend was still a clean residential area for around 40,000 people. The houses had only four floors as a general rule. The first skyscraper In 1938 Frankfurt came upon the chance to purchase a 58 hectare area between Bockenheimer Landstraße, Unterlindau, Staufenstraße and Reuterweg at a very reasonable price, which had previously belonged to the well-established Jewish Rothschild family, land which the Nazi government had put into probation. Although the 1950 selling price was later improved, the return of a third of this area was demanded to be returned as part of the Rothschild inheritance. After this, approval of the construction of a multi-storey development on the Rothschild's returned land was received (they sold it to Schweizer Zürich-Versicherung and Berliner Handelsgesellschaft) and office towers were established directly opposite the old opera house. The Zurich building built in 1960, and demolished again soon after was the first multi-storied building in Frankfurt Westend. The city transformed the remaining part of the area into the Rothschildpark, which is accessible to everyone. The abolition of housing space After the abolishment of control of living space in 1960, Hans Kampffmeyer, the head of the social democratic planning department developed the concept of decentralising the inner city. The adjacent boroughs were to become an extension of the Westend. The so-called Fünf-Fingerplan of 1967 designated that through the Westend five leading axles – Mainzer Landstraße, Bockenheimer Landstraße, Reuterweg, Grüneburgweg and Eschersheimer Landstraße – should