1100 Architect is an architecture firm with offices in New York City and Frankfurt am Main, Germany. Founded in 1983 by David Piscuskas and Juergen Riehm, the Frankfurt division operates under the name 1100: Architekten Riehm Piscuskas PartG mbB, directed by Gunter Weyrich. The firm employs around 40 architects and staff, engaging in architecture, interior design, space planning, and master planning for both public and private clients.
The Frankfurt office is distinguished by work that balances historic preservation with new construction, often integrating sustainable methods and materials. Among its notable projects is the Main East Side Lofts, a 160,000-square-foot complex near Frankfurt’s East Harbor. This project restored a partly completed neoclassical building and added a contemporary twin, both used for residential and commercial purposes. The design received awards such as the AIANY Design Award for Multifamily Residential in 2017.
Another example is the Westend Office, where a 19th-century heritage-listed villa in Frankfurt’s Westend was transformed into the European headquarters of a real estate firm. The adaptive reuse maintained essential historic elements, while updating the interior for modern office needs.
1100 Architect is recognized for projects that involve complex adaptive reuse, integration of historical research, and technical innovation. The Frankfurt team collaborates closely with the city’s Landmarks Department and applies environmentally responsible strategies. The firm’s work has been published in major architecture journals, earning a reputation for detailed, context-sensitive architecture.