By 1941 the rear yard also contained at least one other weatherboard shed or store buildings constructed on a long rectangular plan and a small amenities block.

By this time a first floor window opening in the south elevation was altered to a doorway and a steel gantry is installed, cutting into the original roof alignment above.

The interior was reoriented with counters across the western end of the room, display joinery was constructed, the ceiling is relined with plasterboard and fittings are upgraded.

As part of this work the public telephone booths to the north of the building are removed and the area is converted to a ramped entrance to the post shop.

The original building is constructed to the eastern (street) boundary of the deep rectangular site and the rear yard is largely covered by freestanding and interconnected sheds and amenities blocks.

[1] As it presents to the street, the two-storeyed building is a symmetrically composed, hipped roofed Victorian palazzo form in mass, with a central recessed loggia and a four-arched entrance, flanked by two breakfront pavilions and a modern stairwell wing set back on the north side.

The tower has coffered corner piers, and the clock panels are topped by pediments to all sides surmounted by ball urn finials.

Below the clock, the lower tower face is bracketed by two diagonal consoles and includes a paired window with round arches and accentuated voussoirs to Gray Street.

Above these at the centre of the complex is the original mail room area, roofed by a hipped form with central ridge lantern and weatherboard cladding to the sides.

The central ground floor mail hall's original double-height volume with exposed trusses and ridge lantern remains intact.

[1] Externally, the building's ability to demonstrate key aspects of its original design is good when considered from the principal north, east and south vantage points and overall form.

Major alterations associated with the 1940s mail room extension, 1960s additions and 1980s loading dock and handling facilities, however have diminished the integrity of the rear of the building.

While the western side of the mail hall has been opened to later areas, its full double-height, lantern roof structure and fabric remain clear.

[1] Generally, the building appears to be in relatively sound condition throughout, though there is evidence of extensive water damage in the southern parts at both floor levels.

Like most facilities of a similar period, original fabric and detail in areas of high traffic flow have suffered from mechanical damage.

Its formal composition, grand scale and high quality are markers of Hamilton's status as one of the Colony's significant permanent settlements built on the means of pastoral wealth.

The building nevertheless demonstrates the principal functional and aesthetic characteristics of the type including an accomplished application of style and endowment of monumental civic form; incorporation of frontal components such as accessible offices, clock tower, loggia and porch; and increased size to reflect increased volume of a rapidly developing region and additional functions.

Stylistically, Hamilton Post Office is an impressive Italianate palazzo design, then popular in the government department and further afield, which fully embodies the mid-Victorian Renaissance mode and a symmetrical composition with restrained yet bold detail.

[1] This Wikipedia article was originally based on Hamilton Post Office, entry number 106135 in the Australian Heritage Database published by the Commonwealth of Australia 2019 under CC-BY 4.0 licence, accessed on 9 March 2019.