Variation of Condition 1 of planning permission dated 04 September 2020 (RN: 20/03854/FULL) for, 'Demolition and replacement of existing fourth floor, demolition of existing plant room, and erection of a single storey roof extension at fifth floor and rear extension at second to fifth floor levels in connection with existing office (Class B1) use, provision of new main office entrance, flexible use of part ground and basement floor for either retail or office use (Class A1/B1), creation of roof terrace at fifth floor level, provision of cycle parking spaces and facilities, roof plant and associated external alterations, including replacement windows'; NAMELY, to amend the approved drawings to replace a single ground floor level window on the north elevation with a door and to erect of a bridge over the existing lightwell to provide a secondary fire-protected egress point.

Variation of Condition 1 of planning permission dated 19th April 2023 (RN: 20/04541/FULL) for, '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 install additional plant at rear first floor level and amend the approved enclosure, decorative cladding and green wall. (Application under Section 73 of the Act).

Amendments to planning permission dated 23 February 2022 (RN: 21/07541/FULL) which was in itself an amendment to a previous permission for the 'Erection of infill extension at basement level in order to enlarge existing office (Class B1), use of part ground floor on Mount Street elevation as a shop (Class A1) accessed from existing bay, erection of roof extension to enlarge existing flat (Class C3), insertion of new windows and doors on the north and east elevations, creation of a residential terraces at third floor level and provision of plant within existing vaults'; NAMELY, to change the appearance of the external entrance door into the retail unit at ground floor level, retain a window at basement level and to modify the internal layout from basement to fourth floor level

Amendments to planning permission dated 23 February 2022 (RN: 21/07541/FULL) which was in itself an amendment to a previous permission for the 'Erection of infill extension at basement level in order to enlarge existing office (Class B1), use of part ground floor on Mount Street elevation as a shop (Class A1) accessed from existing bay, erection of roof extension to enlarge existing flat (Class C3), insertion of new windows and doors on the north and east elevations, creation of a residential terraces at third floor level and provision of plant within existing vaults'; NAMELY, to wall mount air condenser units in an enclosure within the front lightwell underneath the external stair along the Balfour Place frontage instead of within the basement vaults.

Variation of Condition 2 of planning permission dated 29 June 2021 (RN: 21/02601/FULL) for amalgamation of 2-4 Old Queen Street and 6 Old Queen Street; erection of infill extension at rear first and second floor level, roof extension with front dormer and lift overrun at fourth level to 6 Old Queen Street; alterations to rear fenestration; new rooflight; new shopfronts; and rationalisation and installation of new plant and air condenser units; all in connection with the use of the ground floor as a café and office entrance, first, second and part third floors as office and third and fourth floor as one residential unit; namely to amend the proposed rear elevation and proposed first floor plan to include revised provision of external mechanical plant at the rear of 2-4 & 6 Old Queen Street.

Variation of condition 1 of planning permission dated 22 May 2020 (RN 19/09542/FULL) for the excavation to extend basement, erection of extensions at ground, first and second floor levels. Alterations to roof including installation of plant equipment and alterations to rooflights, from RN 19/09542/FULL, NAMELY, to vary the approved drawing numbers to allow an enlargement to the basement extension, amend the fenestration on elevations 2 and 4, new smaller extension to the office on the right side of rear elevation and amend the rear terrace.

Variation of Conditions 1 and 10 of planning permission dated 23 December 2020 (RN: 20/06388/FULL) for amalgamation of 2-4 Old Queen Street and 6 Old Queen Street; erection of infill extension at rear first and second floor level, roof extension with front dormer and lift overrun at fourth level to 6 Old Queen Street; alterations to rear fenestration; new rooflight; new shopfronts; and rationalisation and installation of new plant and air condenser units; all in connection with the use of the ground floor as a café and office entrance, first, second and part third floors as office and third and fourth floor as one residential unit; NAMELY, amend the opening hours of the cafe; replace rear rooflight with lantern light; enlargement of lift core; lowering of basement level in No.6; widening door at No.6; revised internal layout; and replacement of front windows.

Variation of Condition 1 of planning permission dated 8 October 2019 (RN: 19/06149/FULL), as amended by non-material amendment dated 28 July 2020 (RN: 20/02998/NMA), for external alterations to the St James's Square and Pall Mall facades, including alterations to windows and entrances, new entrance from Pall Mall and cleaning of brickwork; erection of roof extension to incorporate lift overrun, roof access, concealed open plant area and new plant; and dual/ alternative use of part of the ground and basement levels as either office (Class B1) or retail (Class A1); and associated works. NAMELY to allow amendments including the inclusion of the planter and louvre located adjacent to the building along St James's Square and reconfiguration of the ventilation strategy/ vent above the St James's Square facade central bay window at level 6.

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.