Forster Profile Systems proved to be the ideal partner for this task, both in terms of its portfolio of window profiles and its experience in developing special solutions. In close cooperation with MTZ-Metalltechnik [...] of Cologne, as client, insisted on careful handling of the building's fabric, with a view to retain its original structure and materials. Having performed an inventory, the architects from SSP AG found the [...] are l controlled electrically based on solar radiation. The side-hung element on the inside, with its triple-insulating glazing, can also be opened for maintenance and cleaning purposes. Sustainable prospects