The Plus-Energy Office High-Rise Building of TU Wien (University of Technology Vienna), completed in 2014, is a pioneering example of sustainable construction and renovation in office buildings. The high-rise building, originally built in the 1970s, had formerly been used as laboratory building. Its renovation was accopanied by a research project. In an integrated planning process an interdisciplinary team of experts developed innovative strategies and technologies for extreme energy efficiency in office buildings. Today the pioneering solutions that resulted are being demonstrated in real life at TU Wien.