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).

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.

Non-material amendment to planning permission ref: 2020/01249/FUL granted 16th October 2020 for the 'Erection of a hip to gable end roof extension; lowering the ridge height of the main roof and erection of an additional floor at roof level; raising of the front and rear parapet walls; alterations to the first floor roof of back addition to include the installation of new rooflights; alterations to the front fenestration to include the installation of new windows at first floor level, new windows and doors at ground floor level to replace the existing doors and windows; alterations to the rear fenestration to include installation of new windows to replace the existing windows at ground floor level; removal of existing windows at first floor level to the rear elevation; lowering of internal floor level and change of use from office (Class B1) into residential (Class C3) in connection with the conversion into 2 x 2 bedroom self-contained flats.' Amendments to the description of development to read as follows: Erection of a hip to gable end roof extension; lowering the ridge height of the main roof and erection of an additional floor at roof level; raising of the front and rear parapet walls; alterations to the first floor roof of back addition to include the installation of new rooflights; alterations to the front fenestration to include the installation of new windows at first floor level, new windows and doors at ground floor level to replace the existing doors and windows; alterations to the rear fenestration to include installation of new windows to replace the existing windows at ground floor level; removal of existing windows at first floor level to the rear elevation; lowering of internal floor level and change of use from office (Class B1) into residential (Class C3) in connection with the conversion into 2 x 2 bedroom self-contained dwellinghouses.