12 Golden Square Soho W1F Timeline News and progress updates from 12 Golden Square new development in Soho W1F Post a new milestone New tenant The last remaining floor (1st) at 12 Golden Square has been let to Summit Media, reports Bluebook. The UBS-owned building is now fully let. bluebooklondon.com 08/04/2017 by Buildington Bluebook has launched 12 Golden Square office building in Soho, London W1. 06/02/2015 by Buildington