Abstract: The object of this research is the Palaces of Culture in Leningrad built in the 1920’s – 1930’s. Among all object the author highlights the separate newly built extant Palaces of Culture in the style of constructivism, which are the monuments of cultural heritage. The subject of this research is the questions of state protection of the indicated objects and their maintenance. The article examines the existing conservation zones and territories of the cultural heritage sites; current state of the Palaces of Culture; problems of maintenance; and questions of modern functional profile of the buildings. The author studied the literary sources, analyzed iconographic materials and existing regulatory documents in the area of preservation of architectural heritage, conducted visual observation. The goal of this research lies in determining the current state of the Palaces of Culture in Leningrad of the early XX century alongside the key issues pertinent to state protection of the objects. The results may be valuable for comprising preservation orders for architectural heritage of the XX century, as well as development of restoration and reconstruction projects of the monuments of constructivism. The author concludes on the flawed system of state preservation of the cultural heritage of the XX century, and makes recommendation with regards to its solution.