 The heart of the Georgian city were Wood's Assembly Rooms, and the Pump Room, which, together with its associated Lower Assembly Rooms, was designed by Thomas Baldwin, a local builder responsible for many other buildings in the city, including the terraces in Argyle Street, the Guildhall, The Cross Bath, Widcombe Crescent and Royal Baths Treatment Centre in Bath Street.The Grand Pump Room itself includes a North Colonnade of 9 bays, with unfluted Ionic columns.The South Colonnade is similar but had an upper floor added in the late 19th century.