The apartment building House S in Ludwigsburg places itself as an independent and selfconfident building within the urban context. Its monolithic appearance lends it an aura of irritating exclusivity. Towards the street the house seems closed and introverted, while it opens up totally towards the garden and the city center. In so doing, the house responds to the site conditions and encloses itself against the noise of the nearby passing trains and the highly frequented street.The building regulations demanded a 50° sloped roof; a flat roof was dismissed aftera struggle with the local building department of nearly two years; this became the maintheme of the building design. Roof and facades are treated in the same material quality,are covered in a special type of plaster, olive - grey in colour, giving the house its homogeneous skin and monolithic effect. Dark aluminum windows flush with the facade highten this perception. A deep incision into the building mass creates two carports and marks the three individual entrances to the apartments. Crash barriers lead the cars into the building, interlocking public and private space. In this way, the four-storey building, located on the sloping site unfolds three different apartment - types. A three - bedroom apartment with 140 sqm at garden level, a studio with 55 sqm at street level and, on the top two levels, the client`s 170 sqm duplex. Upon approaching the building, it loses its sense of introversion and opens up views through the entrance`s glass boxes into the garden and the sky. Concrete stairs lead into the apartments, running along the walls of exposed concrete, which form the main support of the reinforced concrete structure. Upon entering the light - flooded interior spaces, the view outside is focused through ceiling-high glazing which runs the whole width of the house while the outside is reflected in the shiny, light - grey epoxy floor. The continuity of the floor and exposed concrete ceiling surfaces support the homogeneous flow of interior space. The duplex works with the theme of the roof`s slope, as the uppermost level, the actualroofspace, is articulated as an orthogonal space, while the sloping roof is visible only at the lower level. An actual inversion of the theme of the roof takes place. Like a table placed within the building volume, the uppermost level does not connect to the outer facades at all and merely communicates with the level below through the cantilevered volumes that project beyond the interior walls. A sculptural space results, caught between inside and outside, above and below, evoking irritation and curiosity. All the selfdesigned interior furniture is made of oakwood that has been stained grey. A folded concrete - stairs lead to the upper floor, ending in a glass - volume. Master bedroom and master bathroom are located here. Closets, shower, toilet and bathtub are added to the walls as serving elements, finally explaining the origin of the cantilevered volumes. Through huge sliding doors one steps on to the roofterrace, which, analogous to the carports, results from a deep incision into the building mass.An extensive view across the city is possible from here, while triangular windows allow views into the lower living area, interlocking the two levels again.House S conceals and reveals, contrasts and surprises and gives an answer to the client`s demand for modern and urban living.