The new CfP II laboratory and office building at Johannes Gutenberg University Mainz showcases a commitment to sustainability and technological innovation. Spanning four storeys, the facility includes specialized research environments such as a clean room, a neutron irradiation unit, and a heavy-duty assembly hall designed for detector units. It features advanced installations of heating, ventilation, electrical engineering systems, and energy-efficient solutions tailored for modern research requirements. With high cleanroom standards, the building incorporates filter fan units to maintain low particle concentrations, walkable cleanroom ceilings for ease of maintenance, and integrated LED lighting for optimal working conditions. The versatile space accommodates both labs and flexible office areas, supporting scientists from diverse disciplines. Complex installations like high-purity gas supply systems highlight the project’s technical prowess, making CfP II a benchmark in architecture and functionality aligned with scientific advancement and international collaboration.