Exzenterhaus Bochum
Height 88.59 m / 291 ft
Floors 25
Official Name

The current legal building name.

Exzenterhaus Bochum

CTBUH collects data on two major types of tall structures: 'Buildings' and 'Telecommunications / Observation Towers.' A 'Building' is a structure where at least 50% of the height is occupied by usable floor area. A 'Telecommunications / Observation Tower' is a structure where less than 50% of the structure's height is occupied by usable floor area. Only 'Buildings' are eligible for the CTBUH 'Tallest Buildings' lists.

Architecturally Topped Out
Structurally Topped Out
Under Construction
On Hold
Never Completed
Competition Entry
Proposed Renovation
Under Renovation
Under Demolition
Completed, 2013

The CTBUH follows the United Nations's definition of Country, and thus uses the lists and codes established by that organization.


The CTBUH follows the United Nations's definition of City, and thus uses the lists and codes established by that organization.

Postal Code

A single-function tall building is defined as one where 85% or more of its usable floor area is dedicated to a single usage. Thus a building with 90% office floor area would be said to be an "office" building, irrespective of other minor functions it may also contain.

A mixed-use tall building contains two or more functions (or uses), where each of the functions occupy a significant proportion of the tower's total space. Support areas such as car parks and mechanical plant space do not constitute mixed-use functions. Functions are denoted on CTBUH "Tallest Building" lists in descending order, e.g., "hotel/office" indicates hotel function above office function.

Structural Material

Both the main vertical/lateral structural elements and the floor spanning systems are constructed from steel. Note that a building of steel construction with a floor system of concrete planks or concrete slab on top of steel beams is still considered a “steel” structure as the concrete elements are not acting as the primary structure.

Reinforced Concrete
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from concrete which has been cast in place and utilizes steel reinforcement bars.

Precast Concrete
Both the main vertical/lateral structural elements and the floor spanning system are constructed from steel reinforced concrete which has been precast as individual components and assembled together on-site.

Utilizes distinct systems (e.g. steel, concrete, timber), one on top of the other. For example, a steel/concrete indicates a steel structural system located on top of a concrete structural system, with the opposite true of concrete/steel.

A combination of materials (e.g. steel, concrete, timber) are used together in the main structural elements. Examples include buildings which utilize: steel columns with a floor system of reinforced concrete beams; a steel frame system with a concrete core; concrete-encased steel columns; concrete-filled steel tubes; etc. Where known, the CTBUH database breaks out the materials used in a composite building’s core, columns, and floor spanning separately.


Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to the architectural top of the building, including spires, but not including antennae, signage, flag poles or other functional-technical equipment. This measurement is the most widely utilized and is employed to define the Council on Tall Buildings and Urban Habitat (CTBUH) rankings of the "World's Tallest Buildings."

88.59 m / 291 ft
To Tip
90.5 m / 297 ft
79.5 m / 261 ft
83.5 m / 274 ft
Floors Above Ground

The number of floors above ground should include the ground floor level and be the number of main floors above ground, including any significant mezzanine floors and major mechanical plant floors. Mechanical mezzanines should not be included if they have a significantly smaller floor area than the major floors below. Similarly, mechanical penthouses or plant rooms protruding above the general roof area should not be counted. Note: CTBUH floor counts may differ from published accounts, as it is common in some regions of the world for certain floor levels not to be included (e.g., the level 4, 14, 24, etc. in Hong Kong).

Floors Below Ground

The number of floors below ground should include all major floors located below the ground floor level.

# of Parking Spaces

Number of Parking Spaces refers to the total number of car parking spaces contained within a particular building.

Tower GFA

Tower GFA refers to the total gross floor area within the tower footprint, not including adjoining podiums, connected buildings or other towers within the development.

10,400 m² / 111,945 ft²
Construction Schedule

Construction Start



Exzenterhaus Bochum GmbH & Co. KG
Gerhard Spangenberg
Structural Engineer
Drees & Sommer Advanced Building; GuD Planungsgesellschaft für Ingenieurbau mbH; Schlaich Bergermann und Partner
MEP Engineer
HHP Nord / Ost; Ing. Büro Landwehr GmbH; Kleinmann Engineering GmbH
Arte-Baumanagement GmbH


FKN - Fassaden GmbH & Co. KG

About Exzenterhaus Bochum

The Exzenterhaus is a major orientation point for the city of Bochum, Germany. Its shape, with 15 polycentric rings set atop the solid foundation of a 22-meter, World War-II-era bomb shelter, would probably make it a landmark at any height. Each floor contains rounded, rentable office space, offering 360-degree views and copious natural light through full-height windows and balconies up to 1.6 meters deep. Communicating spiral staircases between floors in single-tenant spaces are also an option. Further uses may include light displays and use as a projection screen.

The bunker shaft provides a two-story reception area at the base. The remaining bunker floors serve as archival and storage space. The structural design of the building is a tour-de-force. The concrete structure’s floor slabs cantilever up to 4.5 meters but are only 250 mm thick. This is supported by a conical spatial form activating membrane action in the slabs, as well as unbounded, pre-stressed tendons around the slab edges, to counteract cracking.

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