How Buildings Meet The Ground: A study of HL23

HOW

BUILDINGS GROUND MEET THE

HL23 ANALYSIS

NIEL M DENARI ARCHITECTS 515 West 23rd Street Building Function: Residential Structural Material: Steel Proposed in 2005 Construction: 2008-2011 Owner: 23 Highline LLC Developer: Alf Naman Developers Structural Engineer: DeSimone Consulting Engineers, PLLC MEP Engineers: ADS Main Contractor: TG Nickel and Associates

Shereese Trumpet Francesca Messina

HL23 is a concrete and steel frame structure with diagonal perimeter bracing. The use of structural steel was governed by two factors - minimizing the overall weight of the structure for the capacity of the type of foundation and minimizing the amount of interior columns. Due to the unique geometry of the building, the architectural layouts, the quality of soil, and the gravity and lateral load system on the perimeter of the building, steel was the more economical and the efficient material of choice.

SOUTH ELEVATION

EAST FACADE EAST FACADE

EAST ELEVATION

NORTH ELEVATION

SOUTH FACADE SOUTH FACADE

NORTHFACADE FACADE NORTH

Components of Facades: -Steel dual lateral support system -Cast Concrete slab structure -Curtain wall glass mega panel system -Brush finish stainles steel system

HL23

190’

160’

176’

NEIL M DENARI ARCHITECTS

SOUTH ELEVATION W. 23RD STREET HIGHLINE 25’

EAST ELEVATION

50’

STREET ELEVATION: BOUNDARIES AND CONDITIONS HL23

Site conditions include: -Highline continuation -Wide variety of heights -Mixed use buildings (residential, gallery, restaurant)

COMMERCIAL SPACES

RESIDENTIAL ENTRY

GALLERY ENTRY & SERVICES

POINTS OF ENTRY & BUILDING DATUMS

3’-0”

HL23 is divided into a residential portion with an entrance on the west side and a small gallery space on the east.

Both entries comply to the same datum line system to retain a cohesive and aethically pleasing facade design while accomodating a slight slope at grade.

8’-0” DATUMLINE LINE DATUM SLIGHT SLIGHTGRADE SLOPESLOPE IN

1’-6”

GROUNDFLOOR FLOORELEVATION ELEVATION GROUND

2

1

-2” 0

-14”

-10” 0

0

4

3

-5” +4” 0

-4”

-2”

-1”

-1”

2

PROPERTY LINE

6”

-1”

-2” -1”

ϭ Z ^/ Ed/ > EdZ E Ϯ ^ Zs/ EdZ E ϯ ' >> Zz EdZ E ϰ ' >> Zz EdZ E

1 RESIDENTIAL ENTRANCE 2 SERVICE ENTRANCE 3 GALLERY ENTRANCE 4 GALLERY ENTRANCE

POINTS OF ENTRY & FACADE TOPOGRAPHY

RESIDENTIAL ENTRY ELEVATION

-11 1/2”

1

The facade at ground level consists of a variety of layers and depths to differentiate and create more functional elements.

2

4

3

-1/16” -1/16”

-1/16” -11 3/4”

-13”

-12 1/16”

2 -1/4”

-1/4”

0.0”

-12 3/4”

-12”

0.0”

ϭ Z ^/ Ed/ > EdZ E Ϯ ^ Zs/ EdZ E ϯ ' >> Zz EdZ E ϰ ' >> Zz EdZ E

CURTAIN WALL MODULES

A

1b B

C

1a

NON MODULE PANELS

1c

ENCLOSURE SYSTEMS GLASS VS. METAL PANEL A curtain wall system and a metal panel system are both used on HL23 depending on the facade orientation and privacy factor. North and south contain the most glass while the east facade (adjacent to highline users/viewers) is mainly the metal panels.

on the East faรงade

A B 1

2

BUILDING MEETS HIGHLINE GROUND FLOOR ELEVATION

2

1

-2” 0

0

-14”

-10” 0

-5” +4” 0

1

-4”

-2”

-1”

-1”

2

-1”

-2” -1”

BUILDING MEETS HIGHLINE

2

From certain angles the highline appears to dissapear into HL23 but in fact is sits on top of the gallery space with a roller connection to allow for movement.

1

1

2

VEGETATION/PLANTERS AS BUFFERS

BUILDING MEETS HIGHLINE - ODDITIES Between HL23 and the highline there is a 5 foot gap with skylights to the gallery space and planters. Accessibility to this space is limited and the space itself is under-untilized.

5’-0” HL23 1’-6” HIGHLINE

5’-0” HL23

1’-6”

HL23 HIGHLINE

THE HIGHLINE

-1/16” -1/16”

-1/16” -11 3/4”

-13”

-12 1/16”

-1/4”

-1/4”

0.0”

-12 3/4”

-12”

0.0”

ANALYSIS:

ORDER & INTERSTITAL Our analysis of HL23 concludes with an overall look into the order of the building in terms of its regularity in datum lines and dierent kinds of enclosure systems. This is juxtaposed against our findings of its interstitial and irregular spaces due to its facets and connection to the Highline.

HIGHLINE

DESIGN PROBLEM: RESIDUAL SPACE Our design problem and proposal takes into account the issue of residual and interstitial spaces we found through our analysis. We propose to reduse these spaces and physically interact with the Highline, essentially helping HL23 engage the ground on two dierent levels.

INITIAL PROPOSAL

SOUTH ELEVATION - 23RD STREET GROUND

CONCEPT SKECTEHES

IDENTIFYING THE PROBLEM & POSSIBLE CONNECTIONS Because of the 5 foot, almost unusable gap between HL23 and the Highline, we propose a strategy to utilize this space and somehow connect the highline to the existing gallery district in the area, while adding more public space and taking advantage of the glass facades of HL23.

INITIAL PROPOSAL HL23 MEETS HIGHLINE

176’

EXISTING CONDITIONS CONDITIONS EXISTING

EXTEND HIGHLINE TO

EXTEND HIGHLINE TO BUILDING BUILDING

INSERT PUBLIC GALLERY SPACE INSERT PUBLIC

GALLERY SPACE

GROUND FL.

2ND

3RD

55’ 44’ 33’ 27’ 22’

0’

ENSURE ENSURE ACCESSIBILITY ACCESSIBILITY

INITIAL THOUGHTS In an attempt to extend the highline into HL23, the initial proposal included a widening of the highline to reach the east facade of the building. This extension would then lead into the third floor of the building to create a gallery space solely at this level that would then wrap around to the south facade and become present though a currently hidden

Highline

New Gallery

EXISTING

PROPOSED

FINAL DESIGN PROPOSAL BUILDING CORE/CIRCULATION

HIGHLINE PROPOSED GALLERY SPACE

DESIGN PROPOSAL In addition to the stair connection o the highline, the new gallery space is to take up the first three levels of HL23 creating an experiential gallery allowing pedestrians to view art from the upper and lower levels.

Circulation within the building ties into this system with the use of the existing elevator core.

Circulation down through the gallery is meant to mimic the exterior stair from street level to the highline.

Highline

New Gallery

- FLOOR

HIGHLINE

FINAL DESIGN PROPOSAL

LOUNGE

RESIDENTIAL LOBBY

GALLERY LOBBY

GROUND FLOOR

2ND FLOOR

DESIGN PROPOSAL

HIGHLINE

From left to right are the Ground Floor, second floor and third floor plans. The circulation paths/ accesibilty is highlighted by red lines. The blue portions of the plans denotes the areas of proposed change. The public access from the highling is a wide ramp that will physically look like an extention of the highline level.

We proposed to open up 3 Floors of the existing program to include a gallery/commercial space that connects to the Highline. This proposal connects the sidewalk level, Highline level and the

Highline GALLERY

New Gallery

3RD FLOOR

FINAL DESIGN PROPOSAL - ELEVATIONS

EAST ELEVATION

HIGHLINE

EXISTING

PROPOSED

SOUTH ELEVATION

DESIGN PROPOSAL Along with the interior modifications comes the adaptation of the east and south facades. On the south the new stairs become visible and the gallery shows itself on the third floor through a previously hidden portion.

On the east, the ribbon-like windows will continue to wrap across the east facade to make visible the new public portion of HL23.

Highline

New Gallery Space/

EXISTING

PROPOSED