The main goal of the conducted research was to get to know and assess the impact of socioeconomic changes after 1989 on city space development in 26 monofunctional cities of the Eastern Region in market economy conditions. In this research the definition of monofunctional cities refers to industrial cities. In to account has been taken changes of functional o rganization in the cities, i.e. changes of structure of built-up areas and urban areas for th e years 2002-2010.