City Hall was constructed at a cost of £65 million on a site formerly occupied by wharves serving the Pool of London. The building does not belong to the GLA but is leased under a 25-year rent. Despite the name, City Hall is neither located in nor does it serve a city (as recognised by English constitutional law), often adding to the confusion of Greater London with the City of London, whose headquarters is in the Guildhall, north of the Thames. The predecessors of the Greater London Authority, namely the Greater London Council and the London County Council, had their headquarters at County Hall, upstream on the South Bank. Although County Hall's old council chamber is still intact, the building is unavailable for use by the GLA due to its conversion into, among other things, a luxury hotel, amusement arcade and aquarium.