Abstract: In modern metropolises, there is an entire spectrum of open spaces, which includes city squares, parks, river walks, naturally formed landscapes, curtilage in residential developments, and others. Often their appearance contributes not only to sociocultural, but economic development of the territory as well. Social space is an incubator of urban development, assigned with an important role in establishment of the holistic sociocultural structure of the city that ensures relevance of the selected topic, which subject is the public territories. The author examines the link between the sociocultural development of the territory and social space as a new vector of its development, using the methods of theoretical analysis of the scientific-methodological literature and open Internet sources for the extensive coverage of the question at hand, as well as the methods of comparison, analogy, and generalization. The scientific novelty consists in introducing characteristics to the concepts of social and cultural spaces, as well as analyzing the project practices of formation of the social spaces, implemented within the framework of national project of the Strategic Initiatives Agency “Far from the Capitals”. The presented in the article analysis of formation of the experimental open platforms allows concluding that the social spaces are capable of making changes in life of the city, which requires the search for the new ways and methods for their creation, preservation, and modernization.