In Zurich, a house over 25m is considered a high-rise building for fire safety reasons. The zoning plan distinguishes between 80m-high buildings in non-sensitive areas and 40m-high buildings in more sensitive areas. Heights over 80m are possible within the framework of special building regulations.The current guidelines were last revised in 2001. Stadt Zürich, Hochbaudepartement, Amt für Städtebau (AfS), ed., Hochhäuser in Zürich (2001).