101 Spring Street, the former residence and studio of artist Donald Judd, is currently being restored by Judd Foundation.  The only single-use cast iron building left in SoHo, it is slated to reopen in 2013 as a "museum" that presents the building as it was when it was new and the interior, including the furnishings and works of art it houses, as it was when Judd lived and worked there.