The new IDOM Group headquarters are located in a former bonded warehouse (a port bonded warehouse) in the Deusto channel of the Bilbao’s port. They include an area of over 40,000 square feet dedicated to offices, R&D areas like a laboratory, prototyping workshops and social areas. One of the most important goals of the project was to achieve a wide and an open-plan working space, with a great intra and inter departmental visual communication and without barriers between the different levels of duties and appointments within the IDOM company. In the centre of each floor there is a hall which may be used to create an area for secretaries in some instances or also may be used as an area to make phone calls without disturbing the other colleagues. In the widest working spaces, very few offices were planned to be built though it was planned to have many meeting rooms or team working areas. In order to avoid psychological barriers between the offices, the rooms and the open space, IDOM did not want to have a traditional front office glass door including a fixed glass and a swing door, but wanted instead a sliding door to remove those psychological barriers. The Klein telescopic and synchronized system, EXTENDO, was the best one to integrate the different spaces and to reach the set goal. Compared to other existing sliding doors systems available on the market, the EXTENDO system allows a wider opening by having a clear passageway without any mechanism left on the floor. In order to keep the integrated concept and depending on the building needs, in some offices, either recessed tracks or exposed tracks were used with a special black anodized aluminum finish matching the dark ceiling. The 2-doors system allows to open all the panels with only the first one sliding along a fixed glass panel already inserted in the same track as the moving panels.