Registered Architects Rule 6.
A complex building is a building that -
(a) involves elements of high rise or large span, or both, requiring specialised or innovative structural solutions or of low rise requiring highly specialised knowledge; and
(b) exhibits 1 or more of the following characteristics:
(i) is demanding in its ordering and organisation of multiple occupancy or special purpose user requirements, or both, in terms of people and vehicular circulation:
(ii) is complicated in its spatial articulation:
(iii) is complex in the planning and co-ordination of complex construction systems, materials, building services, and fittings:
(iv) is challenging in site configuration and existing features; and
(c) has a significant impact on the natural and built environment and requires an informed response with respect to the urban or rural context and the physical, topographical, and climatic context.
This definition should be read in the context of Registered Architects Rule 7,
Minimum standard for registration as registered architect (b), (c), (d), (e), and (f).