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Post-war Soviet era (1945–1991)

In October 1946 some territories along the northern coast of the Gulf of Finland, which had been annexed into the USSR from Finland in 1940 under the peace treaty following the Winter War, were transferred from Leningrad Oblast to Leningrad and divided into Sestroretsky District and Kurortny District. These included the town of Terijoki (renamed Zelenogorsk in 1948). Leningrad and many of its suburbs were rebuilt over the post-war decades, partially according to pre-war plans. The 1948 general plan for Leningrad featured radial urban development in the north as well as in the south. In 1953, Pavlovsky District in Leningrad Oblast was abolished, and parts of its territory, including Pavlovsk, merged with Leningrad. In 1954, the settlements Levashovo, Pargolovo and Pesochny merged with Leningrad.

Leningrad gave its name to the Leningrad Affair (1949–1952), a notable event in the postwar political struggle in the USSR. It was a product of rivalry between Stalin's potential successors where one side was represented by the leaders of the city Communist Party organization – the second most significant one in the country after Moscow. The entire elite leadership of Leningrad was destroyed, including the former mayor Kuznetsov, the acting mayor Pyotr Sergeevich Popkov, and all their deputies; overall 23 leaders were sentenced to the death penalty, 181 to prison or exile (rehabilitated in 1954). About 2,000 ranking officials across the USSR were expelled from the party and the Komsomol and removed from leadership positions.

The Leningrad Metro underground rapid transit system, designed before the war, opened in 1955 with its first eight stations decorated with marble and bronze. However, after Stalin's death in 1953, the perceived ornamental excesses of the Stalinist architecture were abandoned. From the 1960s to the 1980s many new residential boroughs were built on the outskirts; while the functionalist apartment blocks were nearly identical to each other, many families moved there from kommunalkas in the city centre to live in separate apartments.