21 Grosvenor Place London SW1X 7HN
Partial infill of the existing lightwell to create additional Class E (Commercial, Business and Service) floorspace; demolition and replacement of existing plant room at roof level; installation of replacement plant equipment and associated enclosure at roof level and minor external alterations including replacement of windows, creation of canopy to Chester entrance and new ramps and steps to Grosvenor Place frontage; provision of new ancillary facilities, and other associated works.