 Complete the following phrase:  By the 1960s Dublins housing stock was not only under pressure from a rising population but was also poorly maintained. House collapses in Bolton Street and Fenian Street in 1963 led to the death of four people, forcing Dublin Corporation to adopt emergency measures to deal with the crisis. In 1964, in a response to this housing crisis in inner city areas of the capital, plans were made to build high-rise flat complexes; construction started in 1966 and were completed by the following year. The seven 15-storey towers were named after Irish Republican revolutionaries, to commemorate the 50th anniversary of the 