Interior Space and Exhibition Design GTC Office Space Workspace Design by Cache atelier GTC Office Space is a workspace interior located in Sofia, Bulgaria, created for a construction company that develops large office and retail buildings in Europe. The 450 square metre layout places separate personal offices for each department around a shared collaboration area that extends from the entrance and reception zone. Linear wooden claddings define the different areas and give a corporate character. The exposed ceiling structure and ducts add an industrial touch. The result is a warm and welcoming working environment.