Sustainability is to become the guiding principle of social action and economic activity. At the same time, its implementation is far from clear. In no other field can this be better observed than in architecture. Each volume of "Building Better – Less – Different" explores two areas of sustainability. The third volume combines the topics labor and city. Both spheres are facing profound changes. Forced labor, toxic building materials and deskilling are a worldwide problem in the construction industry and deeply unethical. Thus, the need for globally binding, fair labor practices becomes increasingly apparent. In the urban realm, cities must develop into ecological and social drivers, for instance by the establishment of intelligent mobility systems or by providing a habitat for animals and plants.