The National Trust for Historic Preservation designated the building an endangered historic site in 2003, the only synagogue on the list. It still retained a number of significant architectural features, including "the ornate ark and pulpit, central "bimah" (reader's platform) with etched glass lamps, cantilevered balconies, Gothic vaulted ceiling, and colorful wall paintings"; the lighting included "converted gas fixtures". Features retained from the original construction included Gothic Revival style woodwork and cast-iron railing that follows the lot line, and the original wooden pews. That same year Oshry died. His successor—designated by Oshry himself—was his son-in-law, Rabbi Mendl Greenbaum.