Langer Eugen, Office building in Gronau district, Bonn, Germany
Langer Eugen is an office tower in the Gronau district of Bonn that reaches 115 meters (377 feet) in height and contains 30 floors above ground plus three basement levels. The concrete and glass structure includes 13 elevators and was designed by architects Egon Eiermann and Georg Pollich.
Completed in 1969, the tower housed parliamentary offices during Bonn's time as West German capital. After reunification and the government's relocation to Berlin in 1999, the building was transferred to the United Nations.
Locals gave the tower its nickname after parliament president Eugen Gerstenmaier, known for his tall stature. This informal name quickly replaced the official designation in everyday conversation among Bonn residents.
The tower is part of the UN Campus and serves as headquarters for several United Nations organizations in Bonn. Visitors cannot enter due to its use as an administrative facility, but the exterior and surrounding grounds remain publicly accessible.
The nickname was originally intended as a temporary joke but evolved into a permanent designation for the structure. Today even official documents and signage consistently use the informal name rather than the original title.
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