The plans for the new building were completed by the Queensland Government Architect's office, under the direction of Alfred Barton Brady, in October 1900.

The work involved the over-painting of stucco, removal of original chimneys to north and south sides of the building, illuminated signage, over-painting of upper portion of central fanlight window to façade; automatic sliding aluminium entrance door, concrete steps and retiled floor to entry porch, ramp to north porch, postal box enclosure to façade annexed from the original postal hall.

[1] The Maryland Street front is a basically symmetrical composition, but is confounded by the placement of a tall clock tower on the corner.

This is treated as a breakfront and quasi-pediment, moulded at the top in a red brick cornice, and broken at its base line by a royal coat of arms and the keystone and upper arch of the central window.

On the Railway Street side the stuccoed frieze is punctuated by a series of diagonally angled struts supporting a broad eave, and a stretch of metal-clad roof in a catslide descending from a hipped gable between two stub-parapets.

This theme is repeated on the north-east end of the Maryland Street elevation, where an exposed hipped gable flanks one side of the main breakfront.

It comprises mail delivery work areas, sorting spaces and additional post office box accommodation to Maryland Street.

The west elevation of the original building comprises a timber-framed and weatherboard-clad addition, infilling what is thought to have been a previously open verandah flanked by brick lavatories.

The brick enclosure to the south west has been extended by several courses of brickwork at an unknown date, and a small window removed and patched.

Originally the service counter was located beneath a large brick archway to the west facing into what is now the post office box lobby.

The postal hall roof was restored in the late 1990s and the introduced air conditioning ducting and services are suspended below the ceiling.

[1] Within this space there is also an interview room enclosed by three-quarter height aluminium framed glazed partitions to the northwest corner.

The 1963 and later extension exhibits typical finishes and plan form of the era – the floors are of vinyl tile over concrete, walls of plasterboard and the ceilings are lined in plaster sheeting.

Internally, the spaces have been refurbished, but the interiors retain original fabric in terms of floors, walls, ceilings and joinery, etc., albeit overpainted.

The northern wing, added in 1963 and extended in the late 1980s, weatherboard infill to the west elevation and the loading dock are not significant for the purpose of the heritage listing.

[1] This Wikipedia article was originally based on Stanthorpe Post Office, entry number 105524 in the Australian Heritage Database published by the Commonwealth of Australia 2018 under CC-BY 4.0 licence, accessed on 1 October 2018.