January 26, 2009
Media inquiries about this article should be addressed to: Geri Kery, CTBUH Manager of Operations, telephone: 312-909-0253, email: firstname.lastname@example.orgDue to the current economic climate, some buildings on this list may have slowed construction / development pace or have been put 'on hold' recently. The current intention, however, is that all projects on the list will be completed, though that may change in the coming months / years. Only buildings that are fully in the public domain and fulfill all the criteria listed at the end of this page are included in the CTBUH Tallest 20 in 2020 – there may well be other proposed buildings that would make the list, but are for client / project confidentiality reasons not yet publicized. Also, due to the changing nature of early stage designs and client information restrictions, some height data for 'proposed' tall buildings that appears on this list is unconfirmed.
|Locations: The Tallest 20 in 2020|
Criteria: The Tallest 20 in 2020
|Buildings included in the CTBUH ‘Tallest 20 in 2020’ are either a) completed, b) under construction, or c) considered real proposals.|
a) When is a tall building considered to be ‘completed’?
A completed building can be considered such if it fulfils all three of the following criteria: 1) topped out structurally and architecturally, 2) fully-clad, 3) open for business, or at least partially occupied
b) When is a tall building considered to be ‘under construction’?
A tall building is considered to be ‘under construction’ when site clearing has been completed and foundation / piling work has begun.
c) When is a tall building considered to be a ‘real’ proposal?
A 'real' proposed tall building can be considered such if it fulfills all of the following criteria: 1. Has a specific site, 2. Has a developer / financier who owns the site, 3. Has a full professional design team who are in the process of progressing the design beyond the conceptual stage, 4. Has a dialogue with the local planning authorities with a view to obtaining full legal permission for construction, 5. Has a full intention to progress the building to construction and completion.
How is the height of The Tallest 20 in 2020 measured?
Height is measured from sidewalk level outside the main entrance to the architectural top of the building, including spires, but not including antennae, signage or flag poles.
A single-function tall building is defined as one where 85% or more of its total floor area is dedicated to a single usage. A mixed-use tall building contains two or more functions, where each of the functions occupy at least 15% of the tower’s total floor area. Ancillary / support areas such as car parks and mechanical plant space do not constitute mixed-use functions. Functions are denoted in ascending order, e.g. ‘office / hotel’ indicates hotel function above office function.
A steel tall building is defined as one where the main vertical and lateral structural elements and floor systems are constructed from steel. A concrete tall building is defined as one where the main vertical and lateral structural elements and floor systems are constructed from concrete. A composite tall building utilizes a combination of both steel and concrete in the main structural elements throughout the building. A concrete/steel tall building indicates a steel structural system located above a concrete structural system, with the opposite true of a steel/concrete building.
1. If a tall building is of steel construction with a floor system of concrete planks on steel beams, it's considered a steel tall building.
2. If a tall building is of steel construction with a floor system of a concrete slab on steel beams, it's considered a steel tall building.
3. If a tall building has steel columns plus a floor system of concrete beams, it's considered a composite tall building.
For a more complete overview of the CTBUH's height criteria, click here.
* Some sources list the Pentominium height at 618m / 2028ft, which includes a spire. Despite this, the official height released by the developer and design team is 516m / 1693ft.