The Commonwealth Government's Commerical Building Disclosure program comes into full operation on 1/11/2011. Energyfocus has a CBD assessor who can arrange a BEEC (Building Energy Effciency Certificate) for any office building owner contemplating selling or leasing their property. Note that a BEEC is only required if the Net Lettable area is greater than 2,000 m2
http://www.cbd.gov.au/