Buildings, and districts in particular, offer great potential for climate and environmental protection - whether through the use of sustainable building materials or a resource-saving energy and heat supply. Compared to individual buildings, district solutions also promise greater synergy effects. Climate-friendly and energy-efficient measures can be implemented particularly effectively in districts - not only in new builds but also in existing buildings. Modern technologies such as smart sensors help to noticeably optimize the resource-efficient operation of buildings. Mutual coordination with various infrastructures enables efficient and innovative system solutions.