Begun in 1909 and completed in 1911, the Spanish Baroque style building is exceptional in its construction and design. The plan is that of a Greek cross, with a high dome at the crossing, and barrel vaults above the transepts and sanctuary. Saint Mary Church is one of only a few buildings for which the Guastavinos were actually the architects. They also designed the altars, the terra cotta frieze of the apostles and other interior furnishings.