The building site is situated in the Gangnam district, a commercial southern area of Seoul. The area was previously occupied by an existing anonymous construction which was completely demolished, leaving the space to a new volume. A concrete basement, shaped by the structure, generates a filter space between inside and outside, public and private. It identifies the main entrance and the ground floor cafè and it also structurally support a clear block of bricks on top. Here, there are other four floors, where offices and apartments are. Selected materials remark the strong contrast with the context and recreate a new order in this high density area of the city.