Both the North and South Buildings are constructed of cast-in situ concrete floor slabs with exposed soffits and beams, cast-in situ concrete structural walls exposed on the inside with a steel and brick curtain wall.
The first floor of the South Building, the 'noble floor', has, like its namesake the piano nobile, the highest ceiling.
The largest room is about 8 x 9m, with three smaller rooms opening off it. The interiors feature han-ji paper, a finely textured rice paper which was used in the past to line the walls and ceilings of traditional Korean houses.
The rectangular 930 x 630mm sheets of paper are laid, with a 20mm overlap at the edges, on double-layer plasterboard panels, fixed to the walls with C-shaped steel channels. The boards are edged with 66 x 3mm steel flats to protect the edges and conceal the channels.
The panels form shapes over and around doors and windows. As the han-ji paper is so delicate, switches and socket outlets are mounted directly on to the concrete walls in gaps between the panels. The large ceiling lamps, reminiscent of upside-down buildings, are also made of han-ji paper, here fixed to delicate timber frames.
The floor is covered with glass-reinforced cement precast panels bedded on sand and laid on screed with underfloor heating pipes.