Carlo Baumschlager and Dietmar Eberle set up their architectural partnership in 1985. 

During the early years they designed detached houses and put their first innovative ideas for high-density, low-rise buildings into practice, which soon gained them recognition beyond regional boundaries.

In this initial phase the core team consisted of three to six employees. 

In addition to these projects the partnership extended its activities to the design and construction of commercial and office buildings as well as large housing complexes. Prominent among the clients were private and public developers and local cooperatives. Key aspects of sustainability were incorporated into their planning work at a very early stage; economy, resource conservation and social acceptance evolved into fundamental principles. A good illustration of this is the Eco School in Mäder. In a related development, research into different types of buildings and facades became a major factor in the working methods adopted by Baumschlager Eberle. Once the partnership was firmly established in the regional context, the next logical step, undertaken in the 1990s, was to expand to the national level. Internationally, too, Baumschlager Eberle Architekten gained recognition and acclaim for such projects as the headquarters of the Munich Reinsurance Company and the new airport terminal building in Vienna. This resulted in the setting up of the first branch office in Vaduz in 1999 and the Vienna office in 2001. 

At this stage the partnership had 50 employees. 

Thanks to its dedication and commitment the practice achieved further successes in architectural competitions, while its specific know-how increasingly led to direct building commissions. These included the construction of the UNAIDS building in Geneva and the Moma high-rise apartment blocks in Beijing. The ground was thus laid for the setting up of further branch offices in Beijing (2003), St. Gallen (2006) and Zurich (2007). In view of the increasing degree of complexity involved in building and construction processes Baumschlager Eberle Architekten developed a set of complex management and control tools with the help of their own project log in order to meet quality assurance and sustainability requirements (Kortrijk Hospital, ETH Zurich ...). The presence of local offices enables Baumschlager Eberle Architekten to properly understand the respective cultural context while heeding the specific needs of the client. 

This ‘think global, act local’ approach has resulted in the transformation of Baumschlager Eberle Architekten into a network of autonomous office units and the establishment of further branch offices in Hong Kong (2009), Berlin (2010), Hanoi (2011), Paris (2012), Hamburg (2013), Saigon (2015) and Shanghai (2016). Carlo Baumschlager left the partnership in 2010.

Along with the ongoing internationalization, Baumschlager Eberle Architekten is organized as a holding company. The firm is currently active and present in twelve locations in Europe and Asia. Architecture in each location is the result of intensive and manifold team work. There are 170 employees from 21 countries speaking 19 languages in the offices.