Four identical buildings followed nearby; similar buildings were built during 1949–1952 across the country. This was still an experiment, not backed by industrial capacity or fast-track project schedules. Posokhin also devised various pseudo-Stalinist configurations of the same building blocks, with decorative excesses; these were not implemented. Concrete frames became common for industrial construction, but too expensive for mass housing. January 1951: Moscow Conference It is not known for sure which Party leader personally initiated the drive to reduce costs. The need was imminent. What is known is that in January 1951, Khrushchev – then City of Moscow party boss – hosted a professional conference on construction problems. The conference decreed a transition to plant-made, large-sized concrete parts, building new plants for prefabricated concrete and other materials, and replacement of wet masonry technology with fast assembly of prefabricated elements. The industry still had to decide – should they use big, story-high panels, or smaller ones, or maybe two-story panels, as Lagutenko tried in Kuzminki? Basic technology was set, feasibility studies continued. A year later, this line of action – establishing prefabricated concrete plants – was made a law by the XIX Party Congress, Stalin attending. Major public buildings and elite housing were not affected yet. Peschanaya Square (1951–1955) A different type of experiment concerned the improvement of project management, switching from a single-building to a multi-block project scale. This was tested in the Peschanaya Square development (a territory north from the 1948 Posokhin-Lagutenko block). Using the 'flow methode' of moving crews through a sequence of buildings in different completion stages and a moderate application of prefabricated concrete on otherwise traditional masonry, builders managed to complete typical 7-storey buildings in five to six months. Instead of wet stucco (which caused at least two months of delay), these buildings are finished with open brickwork outside and a drywall inside; from a quality of life consideration, these are true – and the last – Stalinist buildings. The end of Stalinist architecture (November 1955) When Stalin was alive, luxury empire and mass construction coexisted; endorsement of Lagutenko did not mean demise for Rybitsky. It changed in November 1954, when critics openly criticized the "excesses" and the will to build 10–14 storey buildings, Stalin's own will; according to Khmelnitsky, this must have been started by Khrushchev personally. Throughout the next year the campaign grew, preparing the public for an end of Stalinism. The decree On liquidation