CN Tower

Toronto
Height
1
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).

553.3 m / 1,815 ft
2
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."

553.3 m / 1,815 ft
3
Occupied:

Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to the highest occupied floor within the building.

447 m / 1,467 ft
1 2 3 CN Tower Outline
Floors
Height 553.3 m / 1,815 ft
Floors 0
Official Name
The current legal building name.

CN Tower

Other Names
Other names the building has commonly been known as, including former names, common informal names, local names, etc.

Canadian National Tower

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.

Tower

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

1976

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

Canada

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

Toronto

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.

telecommunications / observation / retail

Structural Material
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 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.

Mixed-Structure
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.

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 in a composite building’s core, columns, and floor spanning separately.

concrete

Official Website

CN Tower

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."

553.3 m / 1,815 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).
553.3 m / 1,815 ft
Occupied
Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to the highest occupied floor within the building.
447.0 m / 1,467 ft
Observatory
447.0 m / 1,467 ft
# 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).

9

Top Elevator Speed
Top Elevator Speed refers to the top speed capable of being achieved by an elevator within a particular building, measured in meters per second.

6.1 m/s

Construction Schedule
1973

Construction Start

1976

Completed

2011

Retrofit End

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.

Material Supplier

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

Construction Hoists
Developer
Canadian National Railways
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.

WZMH Architects; John Andrews International
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.

Nicolet Carrier Dressel Associates
Material Supplier

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

Construction Hoists

Retrofit Companies Involved

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.

Mulvey & Banani
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).

Security
Mulvey & Banani

CTBUH Initiatives

Toronto Regional Tour

29 October 2015 - Event

Warm Weather Spaces Walking Tours 2015

17 September 2015 - Event

Research

24 August 2015

World’s Highest Observation Decks

CTBUH Research

Perhaps no element of a tall building is more closely related to the pure pleasure of standing high in the sky and taking in the...

About CN Tower

World's tallest self-supported structure 1976 - 2010.

24 August 2015

World’s Highest Observation Decks

CTBUH Research

Perhaps no element of a tall building is more closely related to the pure pleasure of standing high in the sky and taking in the...

01 June 2012

A New Leader for Telecom Towers

CTBUH Research

With the recent completion of two megatall telecommunication/observation towers it is perhaps time to review these structures and also explain why they are distinguished from...

13 November 2010

Tallest World Records

CTBUH Research

Includes records of the tallest buildings/structures according to function and structural material, the highest spaces according to function, and some lesser-known titles such as the...

30 October 2015

CTBUH 2015 delegates toured Toronto under the lead of CTBUH Canada. The highly successful tour led to many discussion on the lessons learned.

17 September 2015

Warm Weather Spaces Walking Tours 2015

The CTBUH Urban Habitat / Urban Design Committee organized guided walking tours of 16 cities around the globe, focusing on urban habitats around tall buildings.

16 December 2009

Height: The History of Measuring Tall Buildings

This article describes some of the events which took place in the Council's long, and sometimes complex, history of measuring tall buildings.