Wrigley Building North Addition
Chicago United States
Height 89.6 m / 294 ft
Floors 18
Official Name

The current legal building name.

Wrigley Building North Addition
Name of Complex

A complex is a group of buildings which are designed and built as pieces of a greater development.


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, 1924

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."

89.6 m / 294 ft
To Tip
89.6 m / 294 ft
64.4 m / 211 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.

Construction Schedule



Retrofit Start


Retrofit End


Retrofit Companies Involved

MEP Engineer


Joseph Daniel Mansueto


BDT Capital Partners; Mars Incorporated; William Wrigley Jr. Company; Zeller Realty Group
William Wrigley Jr. Company
Graham, Anderson, Probst & White


Property Management

Newmark Knight Frank; Zeller Realty Group

Retrofit Companies Involved

BDT Capital Partners; Zeller Realty Group
Structural Engineer
Klein and Hoffman, Inc.; Wiss, Janney, Elstner Associates, Inc
MEP Engineer
Power Construction Company

Construction Technology

Bluebeam, Inc.


MacRostie Historic Advisors LLC

About Wrigley Building North Addition

Developed as the headquarters for the William Wrigley Jr. Company, the Wrigley Building North Addition was constructed as a two-phase complex, with the taller south tower and its distinctive four-sided clock tower completed in 1921 and the shorter north tower completed in 1924. The façade of the two buildings is composed of approximately 250,000 pieces of glazed terra cotta which vertically transitions through six different colors. The buildings are connected by two skybridges, one at the third floor constructed in conjunction with the north tower and the other added later in 1931 linking the 14th floors for a banking tenant; both of which span across East North Water Street, originally envisioned to be constructed as a two-level street, but later completed in 1957 as an elevated pedestrian plaza.

In July 2013, a full retrofit of the two-building complex was completed with a strong focus on restoration of historic features pursuant to the buildings being declared official City of Chicago Landmarks in 2012.

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