Tourism is becoming one of the most important economic fields in historical cities. The main consequence is a change in commercial structure. Tourism industry is growing in historical city center, with the risk of the «normal urban activities» displacement. In order to analyze the impact of tourism development, the center of Florence has been chosen on the period 2004-2010. The results show that some areas are exclusively aimed at fulfilling tourists’ demands, other keep a multipurpose function.
Keywords: Commercial Structure, Historical City Center, Tourism, Sustainability, Zoning, Florence.