259 George has undergone a $15million upgrade to the mechanical system, double glazing & lobby works. These include:

2 additional low load Carrier chillers
2 new cooling towers
KSB pumps with VSDs
New Cooling & heating coils for all perimeter AHUs
All fans installed with VSDs
LED downlights in common area
T5 light fittings for all empty suites

In 2013, 259 George Street have been elevated to 4.5 stars for NABERS Energy. Energy efficiency assessment for empty tenancy suites have achieved a NLPD of 6W/m2, achieving an Excellent rating. Ongoing upgrades will lead to higher NABERS rating in the future.