ZEB was awarded a Platinum rating, the highest possible, from Green Mark, Singapore’s third-party green building rating scheme. Administered by BCA, Green Mark “is abenchmarking scheme which aims to achieve a sustainablebuilt environment by incorporating best practices in environmental design and construction, and the adoption of greenbuilding technologies.”16The BCA Green Mark Scheme rates buildings accordingto five key criteria. They are:• Energy efficiency• Water efficiency• Environmental protection• Indoor environmental quality, and• Other green and innovative features that contribute tobetter building performance. 17Because an important goal of ZEB is to serve as a testbed for green building technologies, the building’s performance is carefully monitored, and it is performing betterthan predicted! Initial modeling estimated energy usage tobe 206.6 MWh, whereas the building’s annual actual usageis 183 MWh. In terms of emissions, estimates say that ZEB’sCO2 emissions reductions are close to 200 tons