(1)
A building used as a storage garage with all storeys constructed as open-air storeys and having no other occupancy above it is permitted to have its floor, wall, ceiling and roof assemblies constructed without a fire-resistance rating provided it is
(a)
of noncombustible construction,
(b)
not more than 22 m high, measured between grade and the ceiling level of the top storey,
(c)
not more than 10 000 m
(d)
designed so that every portion of each floor area is within 60 m of an exterior wall opening.