Foster & Partners’ 163m-tall Principal Tower is the final piece in the practice’s City-fringe Principal Place development and the starchitect’s first fully designed residential skyscraper in the capital.

At 50 storeys, the £200m block contains 299 luxury flats and is the tallest element of the scheme which also includes 85,000sq m of commercial space including Amazon’s UK headquarters.

The retail giant occupies Principal Place’s 15-storey Building 1. Principal Tower is Building 2, and Buildings 3 to 5 house shared-ownership and social-housing units in a series of low-rise blocks.

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