By the 1930s the architecture of Princes Street had a very mixed character. The Abercrombie Plan of 1949 proposed tighter control of design to create a more coherent appearance. This theme was taken up by the Princes Street Panel, whose 1967 report proposed comprehensive redevelopment with Modernist buildings to incorporate a first-floor level walkway, theoretically doubling the shopping frontage. The plan was partially put into operation, resulting in the demolition of seven old buildings, and the erection of seven new, before the approach was dropped in the 1970s. Two of the new buildings, British Home Stores at no.64, and the New Club at nos.84–87, are now listed buildings.