 On the western side , the first part of the County Hall was built in 1935 , and is known as " A Block " . It was designed by Vincent Harris , and is Neo @-@ Georgian . It is a three storey , built out of red and buff @-@ coloured bricks forming an English bond , with Portland stone dressings . The central section is curved , with wings at 45 degrees to the formed main entrance . The ground @-@ floor is fronted with ashlar , and has three round arches , the middle one of which forms a doorway . The doorway is topped by an engraved coat of arms in the tympanum . The central block spans nine windows , while each wing has a prominent window at the end , framed by an aedicule . The first and second floors of the wings feature eleven sash windows . An extension was made to the south of the building in the 1960s . The original " A Block " is designated as a Grade II listed building . 
