The headquarter of the main association of the Austrian Social Insurance Fund is located in the third district, at Erdbergstrasse. The Wittgensteinhaus, the Rochusmarkt and the Grete Jostpark are important cultural buildings and urban areas arranged during site construction in 70s. In this high-quality context, we carefully place a spatial composition of the landscape park and building cubature. The vertical slice is proportionally supplemented by a horizontal slab and integrated the existing landscape park spatially and functionally. The inviting ground floor zone reaches the users and visitors over the extensive open space with shade-spreading trees or over the entrance along the Kundmanngasse. The naturally exposed hall provides a clear orientation and access to the areas.