The equilateral triangular footprint creates a building with no ends, only three faces perceived as free standing two-dimensional surfaces. The conference center and lobby is sunken into the landscape, leaving the hotel building in a small oasis of Swedish forest in an airport city of parking lots and infrastructure. In the center of the building a series of executive meeting rooms hang inside a hexagonal atrium, creating a kaleidoscopic view from the lobby to the sky.

A series of public programs simultaneously wrap the library on the outside and inside, above and below. Twisting the public program into a continuous spiraling path tracing the library on all sides, creates an architectural organization that combines the virtues of all complimenting models. Like a Möbius strip, the public programs move seamlessly from the inside to the outside and from ground to the sky providing spectacular views of the surrounding landscape and growing city skyline.

The panoramic gallery is a large open space suitable for sculptures and large installations, with the ability to be subdivided for special occasions and events. On the north end, a full-height glass wall offering panoramic views to the pulp mill and river tapers while curving upwards to form a cm-wide strip of skylight. A café is situated at this end of the gallery, where guests can enjoy snacks while taking in the view of the historic pulp mill and surrounding landscape. During the summer months, the café service area spills onto the plateau just outside.

The m site is positioned next to the existing urban fabric in the future development zones of the Yongsan masterplan. BIG’s design includes two elegant towers with a height of and m. To meet the height requirements of the site, the exceeding building mass is transformed into an upper and lower horizontal bar, which bridge the two towers at m and m height. The two towers are additionally connected through the arrival bar at the ground level &#; and a courtyard below ground.

The HQ&#;s south-facing façade is pushed back and oriented towards the main orbital motorway, attracting passersby and gaining visibility from passengers arriving from Amsterdam RAI trains or driving from Europaboulevard. The stepped-back façade also creates an entrance for the building itself, while serving as both passage for pedestrians and traffic barrier for residents in the Kop Zuidas community.