The Tower 2 building at Barangaroo South has received the Green Building Council of Australia's 6 Star Green Star rating. To celebrate the achievement, Level 23 of the building has been painted green.

The largest building in Australia to receive the 6 Star Green Star – Office Design v3 certified rating, which represents world leadership in environmentally sustainable building practices, Tower 2 at Barangaroo South is one of three towers, featuring high performance solar shading facades and energy saving cooling systems that will utilise water from Sydney Harbour.

The precinct aims to generate more renewable energy than used at Barangaroo, recycle and export more water than consumed and reuse, and reduce and recycle more waste than generated.