48 Berkeley Square Mayfair W1J Timeline News and progress updates from 48 Berkeley Square new development in Mayfair W1J Post a new milestone Planning proposal: Use of part basement, ground and mezzanine floor levels as an estate agent (Class A2). Received by Westminster Council 06.02.12. Ref. no.... 01/03/2012 by Buildington New in Buildington! 13/09/2011 by Buildington