Located on the Cheonggyecheon in Seoul, the retrofit of the office tower incorporates the remodelling of the facade, the interior of the common spaces, lobbies, meeting levels, auditorium and executive areas, along with the redesign of the landscaping. The retrofit of the facade and the interiors was carried out while the building remained fully occupied and functional, thus enabling the company to remain working in the building throughout the construction period. In order to enable this, three floors were refurbished at a time, in both the interior and on the facade.
为了满足以环境为主的设计要求，事务所采用综合响应式的外墙设计，很好地改善了现有建筑的室内环境，并与其功能的布置相呼应。Ben van Berkel说道：“该项目以简约、集成的外立面设计，创造了一个包容的系统。它对当地的环境作出回应，确保了建筑的可持续性和经济性，并极大地影响了建筑的内部环境，提高了使用的舒适度。”
Addressing the request that the design be guided by the surroundings, influenced by nature and driven by the environment, UNStudio developed an integrated responsive facade concept which improves the indoor climate of the existing building and reacts to both the programme distribution and the location. Ben van Berkel: "By means of a reductive, integrated gesture, the facade design for the Hanwha HQ implements fully inclusive systems which significantly impact the interior climate of the building, improve user comfort and ensure high levels of sustainability and affordability. "
The basis for the facade expression is to achieve an effect of variety, irregularity and intricacy throughout. In the design for the Hanwha headquarter building the north facade opens to enable day lighting within the building, but becomes more opaque on the south facade, where the sun would otherwise have too much impact on the heat load of the building. This expression is informed by the sun and orientation factors, as well as the programme: by varying the placement of the facade panels a variety of programme-related openings are created. Opening up where views are possible, but becoming more compact on the side adjacent to the nearby buildings.
Direct solar impact on the building is reduced by shading which is provided by angling the glazing away from direct sunlight, while the upper portion of the south facade is angled to receive direct sunlight. PV cells are placed on the opaque panels on the south / southeast facade at the open zones where there is an optimal amount of direct sunlight. Furthermore, PV panels are angled in the areas of the facade where energy from the sun can best be harvested.
The fluid design of the plaza landscape encourages people to enter from all sides, while the multifunctional planters not only serve as a wayfinding element, but also provide customized seating areas. The different zones within the landscape can be used for a range of activities, from more private relaxation to larger scale gatherings.
In UNStudio's concept for the lobby of the Hanwha headquarter building the landscape continues into the interior and acts as a guiding aid, while natural materials and planting provide a relaxing environment for visitors. The increased floor to ceiling height of the lobbies is emphasised through the new facade design by increasing the daylight entering the lobby areas and creating visual connections between the outside plazas and both lobbies. At the lift lobbies, intuitive guidance through interior design elements and integrated lighting seamlessly connects the common areas and hallways at all office levels.
This linkage between lift lobbies and the common reception areas and hallways creates a common identity at the different levels, yet enables flexibility in the workspaces and the allocation of different type/sizes of offices, both now and for the future.
The interior concept combines the guiding principles of wayfinding through lighting and creates within a large corporate office floor, several private and custom designed zones that offer various possibilities for working and meeting in different constellations, from small meetings to focused work, to large boardroom gatherings. The wayfinding strategy continues through to the meeting rooms, creating spaces enclosed by glass, with different degrees of transparency to create enough privacy but also create enough translucency to guarantee well-lit meeting spaces. The different boardrooms at the executive level (level 27) have also undergone a full renovation. The interior design mixes zones for meeting activities that are more formal, with more social and informal meeting areas.
The wall cladding in the auditorium is designed to ensure good acoustics, while animated lighting and different settings enable the atmosphere to be adjusted as required for different events.
The 28th floor restaurant is a space of rest, relaxation and nourishment. Warm wood tones, natural materials and green planting create spaces where the employees of the headquarter building can come to recharge and rejuvenate. Colour accents found in the textiles and furniture differentiate the multiple zones and give it an individual character. The restaurant is divided into multiple zones each catering to different types of cuisines and dining.
Client: Hanwha Group
Location: Seoul, Korea
Building surface: 57,696m² above ground
Building volume: 250,174m³
Building site: 15,333m² Shared Plot
Program: Renovation of facade, interior of common spaces and lobbies, meeting levels including auditorium and executive areas, redesigning of the landscape.
Status: Completed December 2019
UNStudio team: Ben van Berkel, Astrid Piber with Ger Gijzen, Marc Salemink, Sontaya Bluangtook and Martin Zangerl, Hyoseon Park, Gabriele Decandia, Andrea Wong, Daniele de Benedictis, Luke Tan, Jooyoun Yoon, Nina Soltani, Albert Gnodde, Shuang Zhang, Yi-Ju Tseng, Alberto Martinez, Philip Knauf
Local consultant and executive architect: Gansam Partners
Landscape consultant and designer: Loos van Vliet, Haarlem
Facade and sustainability consultant: ARUP Hong Kong
Lighting consultant interior and facade: AG Licht, Cologne