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Type: Office

Size: 183,000 sq ft / 17,000 sq m

Height: 18 floors

Status: Completed 2009

Recognition: AIA Chicago Chapter Award; CTBUH Finalist

In the small town of Singen, Germany, a shift from industrial production to a service-based economy called for the design of a building to serve as a statement for change. Responding to this shift, Jahn proposed a simple, refined form: a long rectangle, which changes in height to form the tower. Hegau Tower’s design is a direct result of close collaboration between architect and client — a clear modernist expression in the first decade of a new century. 

Linearity is reinforced through projecting glass screens and stairs and balconies at the building’s short ends. These straight lines are more than aesthetic — they facilitate an optimized energy/comfort system, limiting the need for technical equipment by reducing solar loads. The building is oriented to minimize direct sun exposure, while motorized shades filter sunlight in high-exposure areas. Inside, basic conditioning is achieved using integrated heating and cooling in the concrete slabs, leveraging the thermal mass of the structure to enable a more comfortable office environment. Meanwhile, a continuous convector prevents unwanted draft resulting from falling cold air in the winter while heating fresh air for natural ventilation year-round.

Related Projects / Hegau Tower