38 State Environmental Planning Policy No 6 - Number of Storeys in a Building (SEPP 6) provides:
(1) Where the application of a provision of an environmental planning instrument requires a determination of the number of storeys, floors or levels which a building contains, that number shall, for the purposes of applying the provision, be deemed to be the maximum number of storeys, floors or levels, as the case may be, of the building which may be intersected by the same vertical line, not being a line which passes through any wall of the building.
(2) Except as provided by subclause (3), when applying subclause (1) in relation to a provision referred to in that subclause, a reference in subclause (1) to storeys, floors or levels shall be treated as a reference to storeys, floors or levels, within the meaning of the provision.
(3) The second reference in subclause (1) to storeys, floors or levels does not include a reference to the whole or any part of a roof used as an uncovered garden, terrace or deck.
39 While the application of cl 3(2) and cl 5(3) excludes the car park from the number of storeys, it does not exclude areas such as the staff room, staff meeting room, laundry and kitchen. The inclusion of these areas results in the building in the rear 25% area of the site exceeding one storey to a greater extent than that estimated by Mr Burrell. Further, the roofed area of the rear terrace and the roof of the building would, under SEPP 6, be included as a storey.