Demolition of the single storey back addition and rear outbuildings attached to the rear of the main building; erection of side and rear extensions at lower ground, upper ground and first floor level, erection of a rear roof extension to replace the existing dormer window, excavation beneath the main building in connection with the creation of a new basement and the formation of a roof terrace at upper ground floor level to the main building; change of use of the main building from office (Class E) into 2 x two bedroom self-contained flats; erection of a part one storey plus-basement single family dwellinghouse in the rear garden; erection of a new boundary wall with three new entrances to the side elevation; associated landscaping and external alterations.

Demolition of first floor of two storey rear part of building and erection of a replacement first floor and an additional two floors above to create new second and third floors at the rear, erection of a rear extension at main roof level to house an internal staircase, change of use of the replacement rear first floor, second floor and third floor level building from office (Class B1a) to residential (Class C3) in connection with the creation of 1 x 2 bedroom, 2 x 1-bed flats and 1 x studio self-contained flats; associated external alterations consisting of the removal of a window and the addition of 4 windows to the first and second floors and the addition of a rooflight to the third floor of the western elevation of the front part of the building; the removal of an external security grill to an existing first-floor rear window.

Change of use of part of the first floor from office (Class E) into 2 x 1 bedroom self-contained flats (Class C3); partial demolition of the first floor in connection with the creation of new roof terraces and formation of new window and doors openings.