A sign at the entrance to the square provides a brief history:
Construction of the square was held up by a restrictive covenant imposed on Lord Berkeley which said any development must not "annoy" Devonshire House, which was at the square's south side. The first house in Berkeley Square was occupied by Sir Cecil Bishop in 1741.
According to Reginald Corby's book, "Mayfair: A Town Within London", the building in the centre of the square - seen below right - which resembles a summer house was actually originally used as a pumping station, providing water for a nearby resident.
The old pumping station building in the centre of the square is now used for general storage by Westminster Council.
Related: Serviced offices in Berkeley Square