"Lumber 4" is a commercial and office building spanning six floors. A recessed ground floor constitutes the commercial level, with the five floors above dedicated to office spaces.

The structure is composed of a masstimber construction with columns and beams made of glued laminated timber.

The floors are constructed using a composite structure of CLT and concrete, creating a slim and efficient floor system that spans long distances while also addressing fire and acoustic requirements.

Diagonals on the ground floor facilitate better vehicular access around the building. The existing communication core from adjacent building phases contributes to lateral stability and access to the office floors.

Between the third and fourth floors, an atrium with an internal staircase made of masstimber has been introduced. Wood elements are prominently displayed in the interior, providing warmth in winter and cooling in summer.

The facade is composed of prefabricated curved wooden elements in pine, treated with green paint. The eaves above the curved elements are straight, creating a curved shadow on the panel. Over time, the paint under the shadow will weather, leading to a changing facade with lighter and darker curved sections. The insulation used throughout is wood fiber. The cladding consists of fire-treated pine.

All load-bearing structures are exposed, and exterior walls are clad with white-pigmente