In December 1996 the building of the Museum was announced as the key Centenary of Federation project, and Acton Peninsula was chosen as the site, with funding confirmed in 1997. The National Museum of Australia opened on 11 March 2001. It is home to the National Historical Collection and is one of the nation’s major cultural institutions. The National Museum of Australia is on the Acton Peninsular, about two kilometres (1.5 miles) southwest from Canberra’s central business district and documents and interprets the country’s history. It occupies an enormous multi-coloured building designed to reflect the different stories of Australia’s past and present. The museum holds thousands of items across dozens of exhibits. They cover everything from Aboriginal history to gold mining, immigration and industrial growth.

The original 1960s building interior underwent a major refurbishment between 1999 and 2000. Good quality and finely polished marble floors and terrazzo wall panels were retained during the refurbishment, and line several areas in the building complex. The office layout dates from 1999 and is typical of conventional office space. Each floor within the building is equipped with conference rooms, tearoom and toilet facilities. Internal fixtures which date from 1999 such as doors, lights, light switches, taps, vanity units, sinks, and floor wastes vary in materials and finishes depending on the building area. However, all fixtures are of high quality materials, designed to last, and remain in good, sound condition.

Building A is occupied by Treasury, Finance and the Café, and features high quality modern office fit out throughout each office level. The Café contains modern fit out including kitchen facilities. Building A includes an extensive basement that is used for storage, secure bicycle use and large bathrooms that include change rooms for use by staff. The main foyer access from Newlands Street and King Edward Terrace include original marble flooring. All other fit out including ceilings and light fixtures date from 1999.

The Department of Finance and the Abacus Child Care Centre occupy building B. Both tenancies feature high quality modern fit outs, purpose built for each specific use. The Child Care Centre includes an extensive custom designed kitchen, kitchenettes in each main playroom and customised bathroom facilities, suitable for each age group ranging from nursery to pre-school age. 

Treasury occupies these buildings. The interior finishes are the same quality and appearance as Building A. These finishes include original stairwells with modern handrails and ceiling and light fixtures dating to 1999. Modern lighting and conventional switching and tagging conventions. 

The CASA building underwent an upgrade of existing workspaces and office suites, replacing the existing communications and structured intranet cabling, in addition to reticulated power suplys to accommodate the authority’s requirements for dependable high speed intranet operations and storage which complimented CASA's strategic direction. 

The Edmund Barton Building undertook upgrade works for the  Department of Agriculture, Fisheries and Forestry, inclusive of refurbishment by way of, Emergency Lighting upgrades, integrated lighting control incorporating office light zoning and switching to minimise unnecessary lighting, perimeter sensing to permit dimming of lighting adjacent to windows in times of strong sun light. Upgrade of mains , tenant switchboards, substation upgrades, generator installation and switchboards, UPS and battery rooms, inclusive of office area lighting utilising energy efficient “T5” fluorescent lighting, integrated to the Building management System which 

New Parliament House underwent an upgrade of maintanence facilities and office suites, replacing the existing communications and structured cabling, in addition to reticulated power supplys to accommodate the increased VOIP and DTO requirements for support and maintenance staff.