9.10.4.

(1) Mezzanines shall not be considered as storeys for the purpose of determining building height where the aggregate area of mezzanine floors does not exceed 10% of,

(a) the suite in which it is located, where there is more than one suite in the storey, or

(b) the storey in which it is located, in all other cases.

(2) Mezzanines shall not be considered as storeys for the purpose of determining building height where they occupy an aggregate area not exceeding 40% of the area of the room or the storey in which they are located provided the space above the mezzanine floor has no visual obstructions more than 1 070 mm above such floors.

(1) Where more than 1 level of mezzanine is provided in a storey, each level additional to the first shall be considered as a storey.

(1) Where a basement is used primarily as a storage garage, the basement is permitted to be considered as a separate building for the purposes of this Section provided the floor above the basement and the exterior walls of the basement above the adjoining ground level are constructed as fire separations of masonry or concrete having a fire-resistance rating of not less than 2 h.

(1) Roof-top enclosures provided for elevator machinery, stairways and service rooms, used for no purpose other than for service to the building, shall not be considered as a storey in calculating the building height.