Its architects were Alexander Parris, best known for Quincy Market, and Solomon Willard, best known for the Bunker Hill Monument.

The new chancel's architect was Ralph Adams Cram, known for such landmark Gothic churches as All Saints', in the Ashmont neighborhood of Boston, and the Cathedral of St. John the Divine in New York City.

From the 1880s to 1980, St. Paul's had a choir of men and boys, who sang introits, hymns and anthems at Sunday morning worship services.

The stones that make up the outside of the building were from St Paul's Cathedral's in London and St. Botolph's in Boston, England.

During this time the skylights on the ceiling were added for natural light, the curving ramp surrounding the altar was made accessible, and stained glass windows and other features were remodeled inside the chapel.