Variation of condition 1 of planning permission dated 19th March 2019 (RN: 18/07737/FULL) for 'Alterations to all elevations of the property to include the installation of balconies and extended windows to create doors; installation of plant at main roof level and lower ground floor level; use of lower ground floor as 6 residential flats (Class C3) and reconfiguration of the existing residential units on the upper floors of the property; extension at lower ground floor level within the existing lightwell and at all floor levels on the Hay's Mews elevation; alterations at main roof level including the creation of an internal residential amenity space' (SITE INCLUDES 27A HAY'S MEWS), NAMELY, to amend the drawings to remove of a number of balconies at all floor levels; relocation of the residential cycle parking; alterations to the layouts of residential units at ground and lower ground floor levels; new windows at ground and lower ground floor levels and use of render instead of the approved Portland Stone. (Application under Section 73)

Variation of condition 1 of planning permission dated 4th October 2022 (RN 22/00448/FULL) for the demolition of the existing hipped roof and construction of a roof extension, a rear extension involving the infill of an existing undercroft area at ground floor, the replacement of an existing link building (between the building fronting Chapel Side and Esca House to the rear) and an additional second floor storey, and the excavation of a basement under the main building, in association with the change of use of the ground and first to residential flats (Class C3). Replacement windows to the front and rear elevations, and the creation of a terrace and green roof on the rear extension roof at third floor level and a terrace at rear fourth floor level. NAMELY, to increase size of basement level and creation of associated lightwell; Alterations to fenestration; relocation and alteration of rear dormers; Internal changes to layout of residential accommodation; and associated external alterations.

Variation of condition 1 of planning permission dated 19 April 2021 (RN: 20/04541/FULL) for the: Erection of an extension at the rear of 18-22 Wigmore Street at first to fourth floor levels and alterations to the rear roof form to allow conversion of the attic space to provide additional residential floorspace for the existing flats (Class C3), including the infilling of an internal lightwell adjacent to 16 Wigmore Street and the installation of a new lift. Alterations at basement and ground floor level including the infilling of a rear lightwell at basement and ground floor levels. Installation of plant within an associated enclosure at rear first floor level with a green roof over and screened plant on a flat roof at fourth floor level to the rear of 22 Wigmore Street. Alterations to the front of the building including new windows, shopfronts and metal railings at ground floor level. All in connection with the dual / alternative use of the basement, ground and first floors as either office (B1) / retail (A1) or a sui generis use comprising piano showroom, office space, new recital room, piano practice rooms and workshop space and use of the second to new fifth floors as 8 residential units comprising 3 x 1 bed; 4 x 2 bed and 1 x 3 bed. (SITE INCLUDES 18, 20 AND 22 WIGMORE STREET). NAMELY, to allow removal of central core and floors and associated replacement to improve sustainability, acoustic and fire safety performance; modifications to ancillary uses within basement, including provision of ancillary kitchen and restaurant area serving guests of Bechstein Hall; kitchen extract and ductwork to be localised; introduction of entrance gates to main front entrance; minor amendments to plant at the rear; and provision of open pergola walkway on the roof at the rear.

Variation of condition 1 of planning permission dated 14th February 2019 (RN:18/10787/FULL) for the Erection of single storey roof extension to create new eighth floor and extensions at sixth and seventh floors to allow the enlargement of two residential flats (Class C3), alterations to shopfronts facing Park Lane and associated external alterations. Namely, to infill part of the terrace at eighth floor level to provide additional residential floorspace, additional glazing at eighth floor level, to amend the window configuration at the 6th and 7th floor level, and the new extension at 8th floor level, glazing to be reduced on the west elevation, extensions and associated guardings on the north and south elevations, raise the rear central projection by 300mm, central space to be moved back to align with the seventh floor at roof level.

Variation of Condition 1 of planning permission dated 14 September 2021 (RN: 20/08346/FULL) for, 'Partial demolition including rear facades and fourth floor mansard roof; a new brick elevation at fourth floor and mansard roof at fifth floor; rear extension; installation of new shopfront and windows; re-configuration of entrances; repair of retained elevations; extension of the chimney stack; basement excavation; connection of the basement, ground and fifth floors to 50-57 Newman Street in connection with hotel use (Class C1), continued use of the first, second, third and fourth floors as self-contained residential flats (Class C3); private terrace at rear fifth floor level in connection with the hotel use and associated external works'; NAMELY, to create an additional basement level in connection with hotel use (Application under Section 73 of the Act).

Variation of Condition 1 of planning permission dated 22nd January 2020 (RN: 19/06551/FULL) for, 'Infilling of internal light wells at fourth to seventh floor levels to create additional office space (Class B1) together with extension at roof level to provide a new eighth floor level comprising four residential units with part mezzanine (Class C3), the recladding of light well walls with minor internal alterations, new residential entrance, and plant in an enclosure at roof level; NAMELY, to make the following amendments to the approved development - mansard structure constructed in steel rather than concrete; existing staircases enlarged to accommodate fire access and escape; internal reconfigurations to the 7th floor; changes to the approved lift overrun and stair core; internal re-configuration of the apartments; reconfiguration of green roofs; addition of green walls to terraces and alterations to fenestration. (Application under Section 73 of the Act).

Variation of Conditions 1 and 10 and removal of Conditions 8 and 9 of planning permission dated 26th September 2016 (RN: 15/05936/FULL) for the: demolition of existing office building and redevelopment to provide a replacement building over two basement levels, lower ground, ground and eight upper levels. Use of the building for residential purposes (Class C3) providing a maximum of 23 flats including 14 car parking spaces at basement level, accessed from Buckingham Gate. Namely, to extend the internal usable space at basement level 2 and reconfiguration of basement 1 without increasing the approved extent of foundations, internal alterations, amendments to window layouts at levels 7 and 8; and to vary the wording of Condition 10 to approve updated Sustainability and Energy Strategy and remove Conditions 8 (uninterrupted demolition and construction) and 9 (installation of PV panels on roof).

Amendments to planning permission dated 20 June 2016 (RN: 15/10444) for: Variation of Condition 1 of planning permission dated 8 December 2011 (RN10/01741/FULL) for development of 55-91 Knightsbridge (including retention of Knightsbridge and William Place facades) to provide retail (Class A1) at basement and ground floor levels, office ( Class B1) at part ground, first, and second floor levels and residential flats at part ground, part first,part 2nd and 3rd to 5th floor levels. Off street servicing and new sub basement car park. Removal and replacement of existing tree on William Street. Demolition of 1-2 William Street and its replacement with a redesigned building with internal linkages to 55-91 Knightsbridge. Restoration and repair of external facades and roofs to 3-7 William Street including reinstatement of original roof profile at 4 William Street, conversion of 1st to 3rd floor levels of 3 and 4 William Street for residential purposes ( Class C3). Namely, the substitution of new drawings to allow minor material amendments comprising a revised number and mix of residential units; the provision of a terrace for a residential unit on the western end of the building; erection of a lift shaft to the rear of 4 William Street; alterations to shopfront of Nos. 3 - 4 William Street; extension at 4th floor level to the rear of Knightsbridge; and reconfiguration of the fenestration. Namely, amendment to the external air vent at 4 William Street.

Variation of listed building consent dated 21.12.18 (RN 18/08464/LBC) for the Variation of Conditions 1 and 10 of listed building consent dated 29 May 2018 (RN: 18/01318) for, 'Use as six self-contained flats (Class C3) including demolition of existing rear extensions and erection of new extension over lower-ground and ground-floor, excavation of rear garden and vault at lower ground floor level. Installation of internal lift to serve second to fourth floors, internal alterations, replacement windows, alterations to facade, provision of rooftop plant and a condenser unit within an acoustic enclosure within the rear patio at lower ground floor level and condenser in front lightwell and landscaping, NAMELY Removal of condition 3F (requiring the submission of details of the pipe and cable routes for the second floor sprinkler system).

Variation of Condition 1 of planning permission dated 29 April 2019 (RN: 17/09802) for 'Demolition of mews building and lower ground and ground floor rear extensions. Erection of replacement mews building on lower, ground and first floors to provide a four bedroom dwellinghouse (Class C3), accessed from Wigmore Place. Erection of replacement lower ground and ground floor levels rear extension to the main building and use of lower ground, ground floor and first to fourth floors as 11 x flats (Class C3). Alterations to rear elevation including the installation of new windows (Land Use Swap with 60 Wimpole Street 17/09804/FULL); NAMELY new timber windows and alterations to plant.