Minimal energy costs - Meeting the company's own stringent requirements with regard to resource conservation, sustainability and economy, the Drees & Sommer office building Obere Waldplätze 11 uses environmentally friendly technology and minimum energy costs to offer highest levels of comfort.

Geothermal energy concept - Earth probes and piping in ceilings are used to heat the building in winter and cool it in summer. At 100 kWh/m²a the primary energy consumption for heating, cooling, ventilation and lighting is a pioneering achievement. The cost of the concept has been amortized within four years, resulting in operating costs of less than one Euro per m²a. 

Thermal comfort - The DS-Plan Expert Team used an interdisciplinary planning approach for the building concept. The result is optimal thermal comfort for minimum energy input. In 2002, the building was regarded as a prototype. In the meantime it has been copied multiple times and further developed.