Study on the first residential cluster for students that meets an energy-plus standard. Documents various developmental stages of production. CUBITY was presented at Solar Decathlon Europe 2014, Versailles. CUBITY is the first modular residential cluster for students worldwide that meets an energy-plus standard. This innovative spatial concept is based on a house-within-a-house principle, with very minimised individual rooms and maximised communal areas with different temperature zones under one roof. It therefore enables transitions from the individual to the communal, from the small to the large, from the whole to the divided as a synthesis of the key motifs cube, city and community. The publication documents various stages of the development of the spatial concept at the architecture faculty of TU Darmstadt, as well as the presentation at Solar Decathlon Europe 2014 in Versailles. CUBITY provides exemplary solutions for sociological and energy issues and combines contemporary forms of communal living with sustainability aspects. Text in English and German.