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Prospect Congregational church remains one of the earliest and most intact Boston-area examples of Romanesque Revival, or Rundbogenstil, characterized here by the round arches and refined use of corbeling. Sanded paint in imitation of sandstone originally covered the exterior. Beyond the distinctive style choice, popular among Congregational churches at this time, Esty provided the congregation with a traditional New England church plan consisting of a nave and symmetrical entrance tower with belfry. Inside, he designed a great ribbed barrel vault ceiling supported above the galleries by massive brackets with carved pendants. In 1879–1880 Silloway extended the nave, duplicating the original design, and added a vestry at the rear.