The Karl-Seitz-Hof in the 21st district presents itself as a garden-type residential building with generously laid out courtyards and green areas. It was built between 1926 and 1931. On a total area of 25,320 m², 1,173 apartments and extensive green areas were built. Between 1995 and 1998 a comprehensive renovation of the Karl-Seitz-Hof took place. Small apartments were put together and equipped with new sanitary facilities.