Charles McLay, who like John Smith Murdoch was another Scot initially mentored by Clark, submitted designs for Bundaberg's new post office in 1886 to the new Colonial Architect, George St Paul Connolly.

[1] In 1907, the first floor Lands Office was converted into post master's quarters, possibly involving construction of timber stud-framed partition in north pavilion.

[1] About 1998, the building underwent major refurbishment of public spaces with replacement of original lath and plaster ceiling with plasterboard ceilings, installation of polished timber joinery and services; repartitioning of area behind public space for administrative offices; creation of continuous bays of private letter boxes within the northern end wing including a projection and new verandah facing Post Office Lane; construction of disabled access ramp to private letter box entrance from Barolin Street; construction of new stair and glazed partition in north pavilion, provision of business mail centre to north of public office, doors removed from corner clock tower entrance and replaced with automatic sliding glass doors, general upgrade of services and finishes throughout building.

[1] The building has two storeys with a 6-storey clock tower and includes the following elements: Externally, Bundaberg Post Office exhibits its original design exceptionally well with regard to the architectural conception, principal materials and detail, although cumulative works have resulted in the loss of some architectural detail and overall form, such as alterations to the flanking single-storey wings, painted wall surfaces and removal of the main entrance doors.

Similarly, works in relation to use and technology such as installation of floor linings, partition walls, suspended ceilings, mechanical ducting, joinery and the like have resulted in the loss of some original fabric and fittings.

The substantial dual frontage and landmark tower in scale and architectural achievement embody a prosperity and future confidence in the city of Bundaberg which stemmed in large from the region's importance to Australia's sugarcane, mining and horticultural industries, exploited from the 1870s.

The scale of the colony and its resources, linked by rail and, in the case of coastal cities, sea, combined to produce prosperous large centres with less dependence on the capital than in other states.

[1] The significant components of Bundaberg Post Office include the main postal building and clock tower dating from 1891 and the single storey additions to both street frontages.

[1] Criterion E: Aesthetic characteristics Bundaberg is a large-scaled building with impressive dual street frontages on a busy principal intersection and a very high degree of landmark quality.

[1] Criterion G: Social value Bundaberg Post Office, built in 1891, to replace the former 1879 building on the same site is important for its association with the development of the city.

It provides a visual and symbolic landmark for the local community and is of social significance for the continuity of postal services which have operated from the building for almost 120 years.

[1] This Wikipedia article was originally based on Bundaberg Post Office, entry number 106125 in the Australian Heritage Database published by the Commonwealth of Australia 2018 under CC-BY 4.0 licence, accessed on 30 September 2018.