Change of use at basement, ground, first, second and third floor levels from hotel (Class C1 use) to a flexible use for either Class C1 or Class C3 purposes to provide seven units of accommodation; Erection of a set-back roof extension for a flexible use for either Class C1 or Class C3 purposes to provide two additional units of accommodation (9 in total); External alterations comprising retention and repair of Newbury Street facade, demolition of the rear facade and its remodelling in brick; the addition of two new (fourth and fifth) floors with amenity spaces enclosed by metal balustrades; and the installation of a sedum roof.