Australian Ethical launched an Australian Ethical Property Trust in October 2009. This will invest in 5 Star Green Star and above rated buildings. A good example is Australian Ethical's 6 star rated HQ in Canberra. This was refitted at relatively low cost from an old brick building. Most of the examples of green office buildings are hi-tech ones, full of expensive and complex equipment.
Of the hitech buildings around, the ones, one of the better seems to be the Majuira Park complex at Canberra Airport, with facilities like like Trigeneration. The buildings have their own natural gas powered electricity generating plant. Waste heat from the plant is used to heat the buildings in winter and, using absorption chillers, cool them in summer.
Another hitech green building in Canberra is Canberra Data Centres. This is a low cost retrofit of an old warehouse, at least as low cost as a data centre with backup power supply can be.