Green Building rating systems have to sell the benefits of certification before they can be physically realized because the developer needs to plan, construct, and sell the property.
Then, after the dust has settled, developers can judge if the promised added value was delivered. The WGBC has reported that a Hong Kong developer sold their BEAM Platiumn rated green building for 40% more than neighbouring properties of the same type, and 21% more than other buildings in the same district. A 40% premium, that is impressive. And the developer attributed the reason for the premium was the developments green building features incorporated to gain BEAM Platinum certification.
The message seems very clear, not only does Green Building reduce the environmental impact of the buildings, having a certified Green Building adds value, and its a financially positive decision.