Malley's patent 18" ventilator shafts to vents in the mailroom [refer to NAA architectural documentation]. Timber slats to enclose the sub-floor area. Heritage listing Ayr Post Office was listed on the Australian Commonwealth Heritage List on 22 August 2012 having satisfied the following criteria. Criterion A: Processes Ayr Post Office, built in 1936, is one of many smaller post offices designed and built throughout Queensland in the interwar period to service towns and regional centres. While the building is not the original post and telegraph office (constructed in 1884), and is not associated with the earliest development of the Burdekin area, it is significant for its association with the local civic precinct which includes the community centre, courts and police station, council offices, and Country Women's Association building. The war memorial and clock lantern on the adjacent traffic roundabout complement the historic context and setting for the building. The relative degree of external intactness and overall heritage character of the building also enhance this value. Criterion D: Characteristic values Ayr Post Office is an example of: Retail post office typology (third generation 1930–1974) Interwar c.1915-1942 Georgian Revival work of the Commonwealth Department of the Interior (H Mackennal) Typologically, Ayr Post Office, built in 1936, is an example of a third generation retail post office. This generation of typologies demonstrate an emergent retail function in postal operations, separation of the telephone exchange area and increased requirements for larger post office box lobby areas with independent access and serviced by a frontally positioned mail sorting room and/or a rear-loading yard. These aspects are evident in the original design to the extent it comprised a symmetrically composed twin porch arrangement, with a central breakfront postal hall to Queen Street. Telegraph and postal services operated independently either side: the south and side porches were fitted with private boxes and the north porch had telephone booths and windows and pay hatch to the exchange. Subsequently, the exchange areas along the north of the building have been replaced by a post office box lobby, the central retail function has been enlarged and the mailroom subdivided. These works have had limited impact on the external presentation of the building, but have impacted on the internal planning and related typological aspects. Stylistically, the building's Neo-Georgian Revival front is conservative and limited to threedimensional massing, symmetry and low-relief decoration. It is considered to be a late application of the