Pyrmont Post Office, dating from 1901, has historical importance for its association with the development of Pyrmont/Ultimo which, by the turn of the century, was a key industrial and warehouse suburb of inner Sydney. The construction of a permanent postal building, at the time, illustrates the consolidation of the peninsula's infrastructure during the period. Sited prominently on a major intersection fronting onto Pyrmont Square and complementing other buildings nearby, the post office is an important element in the streetscape. As at 4 August 2000, Pyrmont Post Office is significant at a State level for its historical associations, strong aesthetic qualities and social value. Pyrmont Post Office is linked with the original post office established in 1852, and as such is associated with the early development of the Pyrmont/Ultimo area. Pyrmont Post Office is historically significant because it is associated with the population growth in the area during the late nineteenth century, which was the result of its development as a key industrial and warehouse suburb in Sydney. The Post Office was also an important part of the consolidation of communications services to the Pyrmont/Ultimo community. The building has a history of continuous original use that spans almost a century. The unusual architectural footprint of the building reflects the difficulty with designing and constructing new buildings in already well-established suburbs in Sydney. Pyrmont Post Office also provides evidence of the development of workers' conditions in NSW, particularly with regard to the level of self-containment of the residence. Pyrmont Post Office is aesthetically significant because it is a distinctive example of the Federation Free Style of architecture, and makes an important contribution to Pyrmont's historic civic precinct. The architectural style and prominent location of the post office also make it a local landmark. Pyrmont Post Office is also associated with the NSW Government Architect's Office under Walter Liberty Vernon, a key practitioner of the Federation Free Style of architecture. Pyrmont Post Office is also considered to be significant to the community of Pyrmont's sense of place. Australian Commonwealth Heritage List Pyrmont Post Office was listed on the Australian Commonwealth Heritage List on 22 June 2004 having satisfied the following criteria. Criterion D: Characteristic values The building, with its Diocletian and other windows, its contrasting finishes to stonework, its parapeted gable with scroll and other features reflects well the characteristics of Federation Free style architecture. Criterion H: Significant people Additional significance is attributable