Grace Universalist Church is a historic church building at 44 Princeton Boulevard in Lowell, Massachusetts. Built in 1896, the building housed a Universalist congregation until 1973, when it was sold to a Greek Orthodox congregation. It is now known as the St. George Hellenic Orthodox Church. The building is a -story brick structure, with an eclectic mix of Romanesque, Beaux Arts, and Classical Revival details. Its single most notable feature is a masonry dome designed by Rafael Guastavino Sr. and supervised by Rafael Guastavino Jr. in 1895. The church is significant as a very early tile vaulted dome built by the immigrant architects Rafael Guastavino Sr. and Jr. in the United States. The church building was listed on the National Register of Historic Places in 2011. See also National Register of Historic Places listings in Lowell, Massachusetts National Register of Historic Places listings in Middlesex County, Massachusetts References Eastern Orthodox churches in Massachusetts Churches in Lowell, Massachusetts Churches on the National Register of Historic Places in Massachusetts Churches in Middlesex County, Massachusetts National Register of Historic Places in Lowell, Massachusetts