Hamburg’s city centre is characterized by dense, high-buildings. The award-winning design for the office building ABC-Bogen adapts itself to the requirements of the neighbouring buildings, whilst setting accents of it’s own. A particular characteristic of the eight-storey street front is it’s curved facade (which is generated from the form of the neighbouring Hypo-Bank building) and continued in the second, to sixth floors. The curved facade reaches noticeably into the street. However, the element which actually characterises the building, is at the rear of the building – although it projects itself over the streetfront of the building: the ‘lemon’. The arched construction, that resembles the form of a lemon, is eleven storeys high. However, due to it’s semi-circular form, it casts minimal shadows onto the neighbouring buildings. The aluminium curtain walling from both parts of the building allows for storey-high glazing throughout the building. Thus, attractive spaces are generated which require a minimum of additional artificial lighting.