City Hall is located in Southwark, stands on the south bank of the River Thames near Tower Bridge. It is the headquarters of the Greater London Authority (GLA) which comprises the Mayor of London and London Assembly . It was designed by Norman Foster and opened in July 2002 .Two years after the Greater London Authority . Just like any other City Hall , That’s where the Mayor Of London stays and work . The interior of City Hall is 42m high , 10 storey building . Its all made of glass panels .