The DARS office building is a model example of a sustainably designed structure owned by a national public company. It serves the national motorway company responsible for the maintenance, development, and safety of the Slovenian motorway system.

The building's exterior is characterized by the distinctive geometry of a steel structure, set 60 cm away from the facade surface and outside the thermal envelope. This structure acts as a passive sunshade, with the depth of the columns adapted to the sun's angle of incidence. Additionally, the dense 2.5-meter-wide grid provides vertical stability to the building. By moving the structural frame to the building's perimeter and deep into the interior—into the area of communication and installation cores that ensure seismic safety—the design allows for a long-term flexible floor plan adaptable to the company's constantly evolving structure.

The floor plans on all levels follow a unified principle: individual cellular offices are placed along the perimeter, with the relocated structural elements allowing for the free placement and rearrangement of partition walls according to a modular system. Larger shared spaces, meeting rooms, and consultation rooms are located in the central area between four communication and structural cores. These spaces are lit by a covered multi-story atrium, which not only provides natural light but also ensures good ventilation—acting as a thermal chimney that encourages natural stack ventilation.
The exterior of the building incorporates numerous measures for sustainable rainwater management, including rainwater harvesting, retention surfaces and tanks, an outdoor pond, and an in-house wastewater treatment system.

The interior fosters a rich interplay between all departments within the company, promoting informal conversations and communication through several areas dedicated to rest, casual dialogue, and work breaks.
Key sustainability measures include the precise classification of materials used according to their level of exposure, long-term usability, and expected lifespan. Materials are categorized as durable (steel and concrete), adaptable within their lifespan (biogenic materials, wood), and frequently replaced (cladding, flooring, 100% recycled materials). The floor plan ensures complete flexibility of use, both in terms of architectural solutions and technical installations. Emphasis is placed on natural stack ventilation, natural lighting, and the use of locally sourced materials with controlled origins and verified Environmental Product Declarations (EPDs).

To assess the building's thermodynamics, CFD (Computational Fluid Dynamics) simulations were conducted. The building meets the A1 energy efficiency class. It is primarily heated and cooled through a network of radiant heating and cooling systems embedded in exposed concrete slabs at a depth of approximately 6 meters throughout the facade perimeter. This ensures stable and consistent maintenance of the building's intended interior temperature. The radiant systems provide a pleasant indoor microclimate without the need for forced air movement.
Significant attention was also paid to enabling a circular economy. Most of the construction components and materials originate from the region, with local products also selected for lighting and interior furnishings.