Tuscan order, full entablature, and pediment. A cast iron stair, designed with heavy columnnar newels and risers pierced in a floral pattern, rises on the center axis to the main floor. The composition is topped by a cupola designed with fluted Doric columnns set between corner piers. A full entablature, with triglyphs, metopes, and mutules, extends uninterrupted around the cupola. The iron steps leading to the portico were formerly the front steps of “Windsor.” While the designer of the building is not known, “skilled black craftsman,” probably slaves, apparently built the chapel.