We will visit two of the largest, most sustainable and most energy-efficient Czech building complexes. Located in an overgrown valley, where once a settlement of a few homesteads used to be, a bank building for 2,400 employees was built in 2007. Designed by the Czech architectural studio AP Atelier, it introduced a building designed as an urban landscape, where the borders between interior and exterior, workspace and garden, office and community disappear. The building was recently (2019) followed by another complex of nearly the same capacity designed by Chalupa Architekti. Akin to the first one, it is considered the state-of-the-art office complex in Europe.