After the Communist Party seized power in Czechoslovakia in February 1948, the city became part of the Eastern Bloc. The city annexed new land, and the population rose significantly, becoming 90% Slovak. Large residential areas consisting of high-rise prefabricated panel buildings, such as those in the Petržalka borough, were built. The Communist government also built several new grandiose buildings, such as the ''Most Slovenského národného povstania'' bridge and the Slovak Radio headquarters.