The set of "Building 2000" brochures illustrates how architects and other building designers can successfully apply passive solar principles to produce energy-effient buildings. "Building 2000" is a pilot project of the European Commission's R&D programme "Solar Energy Applications to Buildings", encouraging the adoption to solar architectures in large buildings. There was an enthusiastic response from project teams responsible for the design of 32 large buildings with a total construction budget of more than 140 million ECU. During the design phase of these buildings the Commission offered free design support to architects and design team members to improve the building designs. The willingness to collaborate with R&D experts encouraged the Commission's action in this field. A summary of the results from the various design support activities is presented in the second part of each volume.