Vattenfall Haus is located in the City Nord, a 289 acre ensemble of office buildings planned and erected in the 1960s north of the Stadtpark in the city of Hamburg. The City Nord as well as Vattenfall Haus are distinctive gemstones within the architectural landscape of the city. Vattenfall Haus was designed and built by the Danish architect and designer Arne Jacobsen in 1969. It has become a classic of modern architecture. Guided tours through the building are highly popular, especially with architecture students, but also with Hamburg residents and visitors to the Hanseatic city. The commercial office building consists of four blocks of different lengths placed side by side. A fine mesh of 6,500 glazed panels reflects the sky over the whole 153 meter wide surface. The building is a composite steel and concrete frame oriented north-south. Supported on prefabricated columns, its comprised of a basement, a below-ground floor holding a foyer, the office restaurant, cafeteria, lecture hall and kitchen, an entry floor at street level, twelve above-ground stories (office rooms) and several roof structures. The longitudinal composite steel and concrete beams were made using in-situ concrete, while those in the transverse direction are precast pre-stressed concrete units. Wind forces are transferred by the reinforced-concrete walls to the gable ends and the building cores. Arne Jacobsen systematically continues the north-south alignment of the building in the pergola, service road, terraced gardens and the parking floors. Parking spaces for visitors are located in front of the reception area on the western side, whereas the 814 parking spaces provided for the 1,366 building users are located on three parking decks on the eastern side of the building. Delivery vehicles access the eastern side of the building down a low-level service road. The building maintenance and janitorial staff have rooms along the service road, which is also flanked by the transformer rooms. The building core houses the lifts, air-conditioning equipment, sanitary cells and heating equipment, ITC rooms and electrical distribution boards. Thanks to comprehensive refurbishment measures related to the technical building services in the most recent years, the Vattenfall Haus boasts numerous innovative technological and energetic features such as the dual-use of cooling water for ventilation/cooling, the reverse flow heat exchange for the heating system, the use of drainage water for sanitary installations and a highly modern Building automation system (BAS). The Vattenfall Europe Business Services GmbH has a commitment to sustainable practices. Besides the above mentioned features, a number of programs on resource efficiency were in place at Vattenfall Haus (Green cleaning products, green office supplies, etc). Getting recognition for this effort was one of the big motivations for pursuing LEED certification. Other motivations were to increase the competitiveness and profitability of the asset through creating operational efficiencies (such as reduced energy and water costs) and a healthier working environment. Besides getting the LEED certification level Platinum, which was quite a challenge for a building designed and built in 1969, the value of applying LEED to this project was the development of energy efficiency measures and capital improvement. These measures and improvements could be developed thanks to the EPA's ENERGY STAR Portfolio Manager used to benchmark the building (ENERGY STAR Score of 97), the Walk-Through Analysis, the Energy Survey and the ASHRAE Energy Audit Level II. Moreover, the building operation manual (required by EA prerequisite 1), the list of all the system-level meters (required by EA credit 3.2) and the waste stream audit (required by MR credit 6) have proven to be valuable tools for training and day to day operations for the Vattenfall Europe Business Services GmbH.