Engel Mansion 6, Walderarchitects, Walder Architects, Walder, Martin Walder, Architects, Architects, Architekten, Arquitectes, Arquitectos, Architekt, Architect, Arquitecte, Arquitecto, Basel, Barcelona, Sabadell, Architektur, Architecture, Architectura, Concepts, Konzepte, Design, Architecture office, Architekturbüro