The Main Building is built with Neo-Classical architectural style. The dome on top of the building is a symbol of power and public authority, representing the broad public acceptance and support enjoyed by Po Leung Kuk.

Traces of art deco can also be found at the windows of the Main Building. The architrave, or the frame of the window, follows closely to the classical design of entablature running along the roofline and emphasizes consistency and regularity

The fasces is bundle of wooden rods strapped together and originated from ancient Roman culture. It has been associated with power, authority and unity in Western culture for past millennia.

Rustication is a masonry technique found in classical architecture to create a texture contrasting with smooth and plain surface. The technique can be traced back to antiquity, but saw widespread application during the Renaissance and prevalent in the late 19th and early 20th century architecture.

Fanlight is a fan-shaped window above a front door of a building, designed for the purpose of drawing additional light into corridors. Originated from 18th century, fanlight provides a form of decoration to the architecture aside from the additional lighting . Overall, the fanlight formed as part of the art deco design of Main Building.

The Main Building’s corridors feature a spacious atmosphere, with a maximum ceiling height of above five metres. High ceiling promotes better ventilation and improves the building’s habitability, which is commonly found in colonial architecture of Hong Kong.

Terrazzo is a composite material commonly found in the construction of floor and wall in the past century. Originated from Italy, terrazzo is a mixture of chips of marble, granite and glass. Blending with cement, the material is grounded and polished to create an aesthetically pleasant and smooth surface.

Transom light is window built on top of a door separated by a bar for the purpose of drawing light into interior or for better ventilation. They are commonly found in buildings constructed prior to the popularisation of air conditioning.

Bat-shaped relief can be found on top of stone couplets in the corridors, which are part of the decoration elements of the building. The art demonstrates the adoption of Western architectural techniques combined with Chinese cultural interpretation.