As originally designed by Burnet, the building was single storey and conceived as a kind of theme and variation on the idea of subdivision by twos and threes. Thus the main facade onto Arlington Street was modulated by means of two pavilions, located at either end of the building with the centre marked by arched windows arranged in groups of threes. The effect is that of a restrained and modest Classicism, more rural than urban in its nature, well proportioned and pleasing in an unpretentious way.