Substantial changes to the cityscape only occurred after a large fire in 1719 when 430 houses burnt down in the north east Altstadt. In order to prevent such disasters in the future the council intensified construction specifications in 1720. Between 1740 and 1800 around 3,000 houses were either adapted or built anew. The number and width of overhangs were drastically limited. As well as that houses had to be built in future with the eaves side facing the road. Only small attics were certified as opposed to gabled dormers.