Before it was used as a church, the building served as a Revolutionary War hospital; it also was the site of the last Indian Treaty Council in 1777. The original structure was a two-story rubble stone Georgian building, its gable roof parallel to the street. Walter added the tower in brick and stuccoed the entire ensemble to conceal the joint. Walter's spire was completed by the high square belfry topped by an octagonal drum inset with clocks on four sides, all surmounted by a slender steeple. Later “restoration” efforts removed the stucco. Around the corner at Spring Garden and Sitgreaves streets is Trinity Episcopal Church (1874), a vigorous Ruskinian Gothic by New Yorker Charles C. Haight.