In recent years, the main vector of scientific research in the field of regional economics has been the development of large localized economic systems. It was proposed to use the term “urbanized territory” as one of the generalizing terms for describing socio-economic systems. The analysis of various interpretations of the concept of “urbanized territory” allowed us to identify and form a limited list of their inherent characteristics and propose an author’s approach to their definition. A general formalized cost model for the development of urbanized territories is proposed, which includes basic infrastructure elements, as well as improvement coefficients for each block. Taking into account the projected investments, the structure of financing measures for the formation of the cost part within the framework of cost modeling, as well as cost distribution options among the main subjects of the formation of an urbanized territory are proposed. Due to the fact that urbanized territories have different levels of urban planning value, the authors in the article propose a marginality coefficient of the territory, which characterizes the change in the market value of real estate in a specific location of the urbanized territory, depending on the formed parameters of the living environment.