By combining and re-planning three adjacent apartments for office use, a clear zoning of the premises has been achieved. The office work process takes place in a large, open space. The secretary’s work surface and the built-in cupboards are originally designed. The variable cross-section of the columns is achieved by cladding the structural elements of the metal posts at their junctions with the slab. At eye level, the column narrows to create a more unobstructed view.