Metro Bar & Restaurant, shown in 1929 on the left, stood in the old row of buildings that were replaced by the Central Library and Town Hall Extension in 1934 and 1938. In the below photo which shows the Town Hall in the background, the Metro was the premises below and just to the left of the Town Hall clock tower.
St Peter's Square. (c) Manchesterhistory.net.
A cracking photo from 1957 shows a builder enjoying a pint on top of the just finished Peter House which stands on the south side of St Peter's Square. Health and safety these days wouldn't allow such a snap shot, nor would they allow dimpled pint pots!
St Peter's Square. (c) Manchester Confidential.