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Architect: William P. Hutchins St. Mary's is the newest and smallest of the churches in Downtown Pittsburgh. The church stands out by contrast with its neighbors, in its size and its red brick exterior, with Gothic details in stone. St. Mary's has been built out at the sidewalk line, with its entrance located under a simple square tower at its corner. The principal aisle inside the church follows the diagonal axis of the entry toward the altar. The interior is relatively plain and auditorium-like: a modern church interior built before the Second Vatican Council.