provide an enlarged public space and telephone exchange facilities, and later the removal of the telegraphic function. Notwithstanding the changed pattern of circulation and use, the external presentation of the building is able to demonstrate key aspects of the original design and planning, particularly in relation to the quarters component, and subsequent phases of development, including the hipped and gabled roof form, the raised weatherboarded frontage to the street and various timberwork details. Alterations include the addition of the disabled ramp to the northeast corner, alterations to the south verandah and installation of private letter box bays. As noted above, the building's original plan form has been altered by the removal of walls throughout the frontal office component, alterations to the south verandah and the demolition of a small lean-to the western end. In general, however, the integrity of the quarters plan form, the reverse timber-boarded construction of the walls (exposed frame with belt rail), boarded ceiling, decorative ceiling vents, and raked bulkheads remains intact, and serve to demonstrate the aesthetic quality and configuration of the original interior spaces. While altered over a substantial period of time, and despite the use and pattern of circulation being altered in part, Boonah Post Office maintains a reasonable ability to demonstrate the legibility of its original design and manner of construction. Externally and internally the building appears to be in sound condition, well maintained and with no major defects visible. Heritage listing The significant components of Boonah Post Office include the evolved postal building and former quarters comprising fabric from the late 19th century fabric through to 1952. Boonah Post Office was listed on the Australian Commonwealth Heritage List on 8 November 2011 having satisfied the following criteria. Criterion B: Rarity In the state context, Boonah Post Office remains as the state's oldest functioning timber post office with a rare relatively intact nineteenth century quarters component. It is also, possibly, the earliest known "Turn of the Century Transitional" type post office, as identified in the Historic Post Offices in Queensland A National Estate Study, 1983. Criterion D: Characteristic values Boonah Post Office is an example of: a post and telegraph office with quarters (second generation typology 1870–1929) a transitional timber form with semi-detached office and bungalow quarters with a later projecting gable. the work of the Queensland Government Architect's office under Alfred Barton Brady Typologically, Boonah Post Office, built between 1893 and 1898,