On per-capita basis, BEAM is one of the most widely-used voluntary green building labelling schemes of its kind in the world ([5] BEC, 2011). The HK-BEAM was really inspired by the UK's Building Research Establishment's Environmental Assessment Method (BREEAM), and it covers environmental issues at each stage of a building's life cycle ([24] Jones Lang LaSalle, 2009). On the other hand, the HK-GBC, which is collectively formed by the Construction Industry Council (CIC), the Business Environment Council (BEC), HK-BEAM and the Professional Green Building Council (PGBC), aims to promote the adoption of green building standards, and sustainable buildings.