IGH Ingenieurgesellschaft Höpfner building physics adviser:
BWF Ingenieurbüro Arndt
In early 2001 a dimensional analysis was carried out, commissioned by the Siemens Kapital-anlagegesellschaft (SKAG), for the company's plot in the City Nord business park in Hamburg. The result was the addition of more than 30,000 m² surface area of offices, divided over two new buildings: the Patio building and the Riegel building.
The Patio building has a square six-storey volume of 50 x 50 m, with the same measurements and height as the adjacent existing Siemens Nixdorf building. The entrance is located on the street side and gives access to a double-height entrance hall. This hall is situated on the patio, which provides daylight to the offices on the inside. By keeping the two lowermost levels on the south side open, there is visual contact with the green park-like surroundings and the landscape permeates right into the building. The building has a concrete column structure with level floor slabs. The offices are on a grid of 1.35 m and can be freely arranged. An unusual aspect is that no lowered ceilings have been used in the offices. The lighting here consists of hanging fittings. For the most part, the building also enjoys natural ventilation with windows that can be opened. 'Betonkerntemporierung' (concrete core temperature control) provides some cooling in the summer and heating in the winter, supplemented with radiators on the façade. The façade is composed of ceramic façade panels 1.35m wide.