(This article is about the town square in London. For other uses, see Berkeley Square (disambiguation).) Berkeley Square /ˈbɑːrkliː/ is a town square in Mayfair in the West End of London, in the City of Westminster. It was originally laid out in the mid 18th century by architect William Kent. The gardens in the centre are open to the public, and their very large London Plane trees are among the oldest in central London, planted in 1789.