The façade is architecturally simple, the shape of the building informing the new structure so that its low-pitched central roof and sloping side aisles mark the roofline, which is enlivened with an open parapet of simple Gothic tracery, uniting the building with the sky. The façade is divided into three sections by shallow buttresses or pilasters. That part above the springing of the door arch is faced with marble in bold contrasting stripes, while the lower part is pale-coloured but much stained in some areas, possibly from the absorption of pollutants.