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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).
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."
Height is measured from the level of the lowest, significant, open-air, pedestrian entrance to the highest occupied floor within the building.
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).
The number of floors below ground should include all major floors located below the ground floor level.
HL23
Building
Completed
2011
residential
steel
53.7 m / 176 ft
14
1
11
1
3,600 m² / 38,750 ft²
Proposed
Construction Start
Completed
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.
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).
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.
You must be a CTBUH Member to view this resource.
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.
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.
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.
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 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).
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.
Best Tall Building Americas 2011 Award of Excellence
2011 CTBUH Awards
HL23 Chosen as Featured Building
1 March 2012 - Featured Building
Situated on 23rd Street in New York’s Chelsea Arts District, directly adjacent to the High Line (a defunct elevated rail line that has been converted into a 20 block long linear park), HL23 was constructed on a very compact 12x30 m (40x100 ft) site. The volume of the condominium building increases as it rises up. This expanding profile was a direct response to the client demand for more sellable square footage, but it was driven by the particular conditions of the site, not least of which was the High Line itself.
With a captive audience in mind, the building is designed as a complex prism whose proportions, angles, and profiles continue to shift as one walks past on the elevated park. In this sense, although HL23 is a private program, the building participates in the public experience of the park. HL23 thus oscillates between urban infill and object building, mediating the context of near and far views, which reaffirms its optically-complex characteristics. Materially and structurally, the building strives to reflect its prismatic geometry though exposed steel pipe columns and diagonals, and an undulating east façade clad in stamped stainless steel panels.
Except for the cast concrete substructure and some interior finishes and surfaces, all components of HL23 were fabricated off site. With more work done off site, tolerances in most areas were reduced to a minimum, challenging each fabricator to work as close as possible to physical limits. Although prefabrication is a long standing ambition of the industry, here the efforts to raise the level of precision of the building’s components allowed otherwise complex conditions to be resolved more simply. In particular, the north and south curtain walls (produced in Dongguan Province, China) were shipped in mega-panel assemblies allowing for rapid erection and a uniform appearance across the folded surfaces.
Best Tall Building Americas 2011 Award of Excellence
2011 CTBUH Awards
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