Conversion of the existing four storey residential property to comprise 1 x 2 bedroom and 1 x 1 bedroom self-contained residential units (use class C3) at lower and upper ground floor level and 1 x 5 bedroom, 7 person House in Multiple Occupation (sui generis) at first and second floor level; demolition of existing rear external structure and erection of a single storey extension to the rear and side of the existing back addition at lower ground floor level.