Around four in every five commercial buildings in Australia were built before 1990 – sometimes decades before ‘sustainability’ became part of the property vocabulary. Most of these office buildings are poor environmental performers, but this makes them prime candidates for environmental upgrades.

While the top end of town understands the benefits of a green rating – from attracting talented employees to demonstrating corporate social responsibility – the ‘big middle’ is not so convinced. There remains a hint of scepticism in this large section of the market about how much money can really…