The three docks were completed between 1855 and 1921 on riverside marshes in East Ham and West Ham (now the London Borough of Newham). The Victoria and Albert docks were constructed by the London & St Katharine Docks Company, to provide berths for large vessels that could not be accommodated further upriver. They were a great commercial success, becoming London's principal docks during the first half of the 20th century. They specialised particularly in the import and unloading of foodstuffs, with rows of giant granaries and refrigerated warehouses being sited alongside the quays. The docks' great size and provision of numerous finger quays gave them a collective span of over of quaysides, serving hundreds of cargo and passenger ships at a time. Following the opening of the Royal Albert Dock in 1880, giving the Royals access to Gallions Reach, below London Bridge, the rival East & West India Docks Company responded with the construction of Tilbury Docks even further down river. The ruinous competition led eventually to all the enclosed docks being taken over by the Port of London Authority (PLA) in 1909. The PLA completed the King George V Dock in 1921 and reserved land to the north for a fourth dock, never built.