The immediate successor to the “e_3” project was “c_13”, which is also a hitherto unprecedented instance of a seven-story metropolitan wooden structure. This multifunctional building accommodates a café with adjoining event rooms, a day nursery, medical practices and offices, community residential spaces, as well as private apartments.

In opposition to the convention of the classical side wing, is the courtyard development detached from the firewall, which thus reflects uniform light into the interior. The three courtyards set along the central axis of the building are linked via connecting views. The freestanding staircase highlights the building’s marked divergence from its neighbors vis à vis division into stories while guiding the gaze into the depths of a school courtyard ensemble which enjoys protected monument status.

In the interior, Timber-concrete composite ceilings span a lucid grid of steel girders on wooden supports through the site’s 45 m of depth. The shell of the courtyard building (building class 4) consists of a completely prefabricated timber frame construction. Solid laminated timber walls are responsible for the entire stiffening of the building and – as a loadbearing façade – also support the front building (building class 5), along with the weight of the reinforced concrete staircase.