2527
Global
Height rank

155 North Wacker

Chicago
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    Metrics
Height 194.6 m / 638 ft
Floors 45
Official Name
The current legal building name.

155 North Wacker

Type
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.

Building

Status
Completed
Architecturally Topped Out
Structurally Topped Out
Under Construction
Proposed
On Hold
Never Completed
Vision
Competition Entry
Canceled
Proposed Renovation
Under Renovation
Renovated
Under Demolition
Demolished

Completed

Completion

2009

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

United States

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

Chicago

Function
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.

Office

Structural Material
All-Steel
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 an “all-steel” structure as the concrete elements are not acting as the primary structure.

All-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 and/or steel reinforced concrete which has been precast as individual components and assembled together on-site.

All-Timber
Both the main vertical/lateral structural elements and the floor spanning systems are constructed from timber. An all-timber structure may include the use of localized non-timber connections between timber elements. Note that a building of timber construction with a floor system of concrete planks or concrete slab on top of timber beams is still considered an “all-timber” structure as the concrete elements are not acting as the primary structure.

Mixed-Structure
Utilizes distinct systems (e.g. all-steel, all-concrete, all-timber), one on top of the other. For example, a Steel Over Concrete indicates an all-steel structural system located on top of an all-concrete structural system, with the opposite true of Concrete Over Steel.

Composite
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 within a composite building’s primary structural elements.

Concrete-Steel Composite

Energy Label

LEED Gold

Official Website

155 North Wacker

Height
Architectural
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."

194.6 m / 638 ft

To Tip
Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to the highest point of the building, irrespective of material or function of the highest element (i.e., including antennae, flagpoles, signage and other functional-technical equipment).
194.6 m / 638 ft
Occupied
Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to the highest occupied floor within the building.
178.8 m / 587 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).

45

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

2

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

163

# of Elevators
Number of Elevators refers to the total number of elevator cars (not shafts) contained within a particular building (including public, private and freight elevators).

21

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.

115,906 m² / 1,247,602 ft²

Rankings

#
2527
Tallest in the World
#
340
Tallest in North America
#
44
Tallest in Chicago

Construction Schedule

2007

Construction Start

2009

Completed

Architect
Design

Usually involved in the front end design, with a "typical" condition being that of a leadership role through either Schematic Design or Design Development, and then a monitoring role through the CD and CA phases.

Structural Engineer
Design

The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.

MEP Engineer
Design

The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.

Contractor
Main Contractor

The main contractor is the supervisory contractor of all construction work on a project, management of sub-contractors and vendors, etc. May be referred to as "Construction Manager," however, for consistency CTBUH uses the term "Main Contractor" exclusively.

Other Consultant

Other Consultant refers to other organizations which provided significant consultation services for a building project (e.g. wind consultants, environmental consultants, fire and life safety consultants, etc).

Façade

These are firms that consult on the design of a building's façade. May often be referred to as "Cladding," "Envelope," "Exterior Wall," or "Curtain Wall" Consultant, however, for consistency CTBUH uses the term "Façade Consultant" exclusively.

Material Supplier

Material Supplier refers to organizations which supplied significant systems/materials for a building project (e.g. elevator suppliers, facade suppliers, etc).

Façade Maintenance Equipment
Developer
The John Buck Company
Occupier/Tenant
Mercer; Skadden, Arps, Slate, Meagher & Flom LLP; UL Solutions
Architect
Design

Usually involved in the front end design, with a "typical" condition being that of a leadership role through either Schematic Design or Design Development, and then a monitoring role through the CD and CA phases.

Structural Engineer
Design

The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.

MEP Engineer
Design

The Design Engineer is usually involved in the front end design, typically taking the leadership role in the Schematic Design and Design Development, and then a monitoring role through the CD and CA phases.

Contractor
Main Contractor

The main contractor is the supervisory contractor of all construction work on a project, management of sub-contractors and vendors, etc. May be referred to as "Construction Manager," however, for consistency CTBUH uses the term "Main Contractor" exclusively.

Other Consultant

Other Consultant refers to other organizations which provided significant consultation services for a building project (e.g. wind consultants, environmental consultants, fire and life safety consultants, etc).

Façade

These are firms that consult on the design of a building's façade. May often be referred to as "Cladding," "Envelope," "Exterior Wall," or "Curtain Wall" Consultant, however, for consistency CTBUH uses the term "Façade Consultant" exclusively.

Material Supplier

Material Supplier refers to organizations which supplied significant systems/materials for a building project (e.g. elevator suppliers, facade suppliers, etc).

Façade Maintenance Equipment

CTBUH Initiatives

Chicago Regional Tour

29 October 2015 - Event

EMI Lead Chicago Tall-Building Study Trip

25 May 2015 - Event

 

Videos

20 September 2012 | Chicago

How Tall Buildings Meet the Ground is as Important as How They Meet the Sky

Today, urbanism is synonymous with tall buildings, and because of their symbolic nature a great deal of attention is given to how these buildings meet...

 

Research

21 September 2012

How Tall Buildings Meet the Ground is as Important as How They Meet the Sky

James Goettsch, Goettsch Partners

If you are concerned about the urban habitat, you have to be concerned about whether or not buildings provide a positive experience at the ground...

 

Global News

03 November 2023

Company Opens New Downtown Chicago Location

On 24 October 2023, it was announced that the newest location of UL Solutions opened in downtown Chicago. The company’s new approximately 40,000-square-foot space is...

 

About 155 North Wacker

While designing 155 North Wacker, the development team strived to create unique space at the lobby level while incorporating space planning efficiencies for a 2,500 square meter (27,000 RSF) floor plan for tenants with exceptional views, ultimately situating the building 15 meters (50ft) at a minimum from all of its neighbors, providing exceptional light and air.

Tenant-desired amenities and sustainable design elements were also at the forefront of considerations for the building. At lobby level, the building emphasizes continuity of space while highlighting its surroundings with a distinct exterior 14 meter (46ft) tall arcade that provides pedestrians with a protected area while showcasing the building’s entrance. This arcade leads pedestrians through the walkway and then opens to a 836 square meter (9,000 sq ft) public park, which will tie the building to its surrounding area while creating an architecturally significant corridor along Randolph Street that extends eastward to Millennium Park. The park will be developed and maintained by the building and donated to the City of Chicago.

30 October 2015

Chicago Regional Tour

CTBUH 2015 delegates toured Chicago and its architectural marvels. From recently constructed skyscrapers to the modern marvel of Willis Tower, which held the tallest title for 25 years.

29 May 2015

EMI Lead Chicago Tall-Building Study Trip

A group of 20 Belgian real estate professionals traveled to Chicago from May 25-29 to visit several tall buildings, and related developments as part of a CTBUH Belgium study trip.