Compared to other cities, there are few tall buildings in Zürich. The municipal building regulations (Article 9) limit the construction of high-rise buildings to areas in the west and north of the city. In the industrial district, in Altstetten and Oerlikon, buildings up to 80 meters in height are allowed (high-rise area I). In the adjacent high-rise areas II and III the height is limited to 40 meters. Around the year 2000, regulations became more flexible and high-rise buildings were again planned and built. The people's initiative "40 meters is enough," which would have reduced both the maximum height and the high-rise buildings area, was clearly rejected on 29 November 2009. At this time in Zürich about a dozen high-rises buildings were under construction or in planning, including the Prime Tower as the tallest skyscraper in Switzerland.