NAB House is co-owned by AMP Capital Investors and Multiplex Property Funds Management. In September 2008 Buildcorp was appointed as the preferred builder for the refurbishment of 14 of the 29 levels of the building plus an extensive ground floor lobby upgrade, basement amenities and base building services upgrade targeting a 4.5 Star ABGR rating and a 4 Star Green Star “as-built” rating. The building consists of 40,200m2 of NLA over 29 commercial floors, with a GFA of 63,000m2. The refurbishment is being undertaken with existing tenants remaining on site and therefore requires meticulous programming of the works and extensive tenant liaison to establish the extent of temporary works, out of hours working and staging so as not to disrupt the normal operations of the building.