City of London tall office buildings including the 600-foot (183 m), 47-storey Natwest Tower, the first skyscraper in the UK. Office space development has intensified especially in the central, northern and eastern parts, with skyscrapers including 30 St. Mary Axe ("the Gherkin"'), Leadenhall Building ("the Cheesegrater"), 20 Fenchurch Street ("the Walkie-Talkie"), the Broadgate Tower and the Heron Tower, the tallest in the City. Another skyscraper, 22 Bishopsgate, is under construction. The main residential section of the City today is the Barbican Estate, constructed between 1965 and 1976. The Museum of London is based there, as are a number of other services provided by
30 St Mary Axe not recoverable, forcing them to relax their building constraints; they hinted that an "architecturally significant" building might obtain a favourable reception from City authorities. This gave the architect a free hand in the design; it eliminated the restrictive demands for a large, capital-efficient, money-making building, whose design was per the client's desire. The new building's low-level plan satisfied the planning authority's desire to maintain London's traditional streetscape, with its narrow streets. The mass of the tower was not too imposing. Like Barclays Bank's former City headquarters in Lombard Street, the idea was that the passer-by in neighbouring streets would be