Alterations and extensions to 49-50 Berkeley Square and 49-50 Hays Mews, including basement excavation to provide one additional level, erection of a courtyard extension, provision of terraces at 2nd and 4th floor levels, partial roof replacement and replacement of roof plant including installation of photovoltaic panels, in connection with the use of the premises as a private Members Club including health/wellness facilities and restaurant/bar facilities (Sui Generis).