Architect Foster + Partners has completed its first residential skyscraper in London, which contains 299 luxury apartments. Named Principal Tower, the 50-storey building marks the completion of Principal Place, which is a mixed-use development positioned between Shoreditch and the capital’s financial district. As part of the development Foster + Partners also designed a 15-storey office for Amazon UK. The tower was commissioned by Concord London and Brookfield Properties to help boost the scheme’s “residential appeal” alongside the development’s commercial offerings, bars and eateries.