The Sisters of St. Francis complex is listed on the National Register of Historic Places. The complex is situated within the north central portion of the property. The portion of the complex that lies between Mill Street and Ellicott Creek includes the large Mother House (St. Mary of the Angels Convent), the focal point of the religious campus. Constructed in 1928, the Mother House is a Late Gothic Revival style building with two courtyards, exterior walls of buff-colored brick, stone trim entrances, windows, water table, and a slate-shingled roof. Ancillary buildings include a boiler house, three garages, and a gatehouse. While the Mother House is the focus of the complex, the campus as a whole with its various buildings set within the landscape is significant. Other contributing site features include the circular drive surrounding the Mother House and a set of radial walkways leading to various contemplative and work spaces, including the arbor, the gazebo, the stone grotto, and the stone steps leading to the orchard. While some components of the original 100-acre complex such as the chapel, the barns, and the cemetery have been compromised by new construction and are not included within the boundaries of the nomination (nor the park), the roughly 30-acre nominated area retains the principal structures and the feeling and character of the complex as it developed during the period of significance, 1928-1956.