Designed by architects Twentyman & Askew, the Block is one of Melbourne's most richly decorated interior spaces, replete with mosaic tiled flooring, glass canopy, wrought iron and carved stone finishings. The arcade is L-shaped with an octagonal rotunda at the corner, connecting Collins Street at the south end to Elizabeth Street on the west. On the north side, the arcade connects to Block Place, a covered pedestrian lane that leads to Little Collins Street, opposite Melbourne's oldest shopping arcade, the Royal Arcade. The Block Arcade's six-storey external façades on both Collins and Elizabeth streets are some of Australia's best surviving examples of Victorian architecture in the Mannerist style.