Langer Eugen (English: "Tall Eugene") is an office tower in the Gronau district of Bonn, Germany. It was built between 1966 and 1969. Since 2006 it has housed several United Nations organizations. Until the German Bundestag (parliament) moved to Berlin in 1999, the building was the primary location for the offices of the members of the Bundestag. After renovations, eleven UN organizations moved into the building and it began serving as the center of the UN Campus, Bonn. Langer Eugen is protected as a landmark or listed building under the North Rhine-Westphalia Monument Protection Law. It is currently the second-tallest building in Bonn and the 43rd tallest building in Germany (excluding non-habitable structures such as radio and observation towers, steeples, and chimneys). When it was built it was briefly the second-tallest building in Germany, behind the Bayer-Hochhaus. History Old Representatives House The Bundestag, which met in the Bundeshaus in Bonn beginning in 1949, had built a 160-office building connected to the Bundeshaus in 1951 to house the representatives' offices, the "Abgeordnetenhochhaus" (Representatives Tower). As the Bundestag at that time had nearly 500 representatives so additional office space was rented for the other representatives. Construction of a new office building was prevented by a building freeze which took effect in 1956. The freeze was enacted due to Bonn's officially "provisional" status as capital of West Germany. It was felt that excessive construction would make its status seem more permanent and undermine the eventual reunification. The halt was eventually loosened as the lack of space grew ever more urgent in the early 1960s. At that time, planning for the new Representatives House began. Construction and renovations The area between the Bundeshaus and the Bonn Sports Complex, which was in the process of relocating, seemed ideal. In March 1965, Egon Eiermann, one of the most prominent German architects of the period, received the contract for the design and the artistic management. The cornerstone was laid on August 29, 1966; it topped out on May 10, 1968; it was dedicated on February 19, 1969; and the representatives moved in on November 1, 1969. The construction cost 50 million Deutsche Marks. With the completion of the building, each representative in the Bundestag had his own office of 17 square meters with additional open plan offices for secretaries. In 1975, glass doors were installed on all office floors for fire protection and an emergency landing platform