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Carbon neutral must be defined in a strange way. To try to neutralise the CO2 emitted by the CHP system perhaps they could grow a tangle of vines down the side of the building, irrigated by 'wastewater'. Will we still have natural gas by the time the building is ready for demolition? I suspect the treated water is only grey not brown. Everything seems to be backed up eg perhaps mains electricity helps with the AC in hot weather.
To me a 6 star green building would be completely disconnected from water, sewage, gas and mains electricity, with only phone connections. Better still let the employees work from home in between sessions of backyard farming.
I must admit I don't see how its carbon neutral, even if it is very energy efficient.
I think they'd need solar panels on all the rrofs, plus a wastewater / biogas plant feeding the cogeneration system.
Maybe a few wind turbines too.
Still - as far as Syndey property development goes its a big step forward.