External alterations to the existing building (Class E), including the part demolition of the existing roof and rear facade, and erection of a new 2 storey roof extension and extensions to the rear at floors 1-7; creation of a new accessible roof terrace and a plant enclosure at roof level; refurbishment works to the front facade including stone repair, replacement tiling, and lowering of principal entrances and other associated works; works to the north facade including introduction of new door and window at ground floor level; flexible use of part ground and part lower ground floors for either Office (Class E) or Restaurant and Cafe (Class E)/ Drinking Establishment (Sui Generis); and other associated works.