The document provides design requirements for Europe's most energy efficient commercial building to be constructed in Oslo, Norway. It must have a total energy need of less than 80 kWh/m2. The building will contain 8,500 m2 of office space and 8,500 m2 of hotel space for a total gross area of 17,000 m2. It will be constructed on a 100m x 24m site located near the Oslo S railway station with a maximum height of 67 meters and up to 20 stories. The building must have indoor temperatures of 21 degrees Celsius during occupation hours and address parking and neighboring building requirements.