73 Brook Street Mayfair W1K Timeline News and progress updates from 73 Brook Street new development in Mayfair W1K Post a new milestone Westminster City Council has granted permission for: Display for a temporary period of six months of a non-illuminated 'to let' board attached to the railings in front... 22/10/2013 by Buildington Planning permission granted for: Display for a temporary period of six months of a non-illuminated 'to let'/ 'for sale' board attached to the railings in front of the... 25/04/2012 by Buildington