Question: On March 11, 2013 what did an artists' community located on a 400 acre estate in Saratoga Springs become designated as, who had a guest that is a playwright born in Roanoke, Virginia who began writing in elementary school, and graduated from New York University Tisch School of the Arts Undergraduate Film Program and Graduate Dramatic Writing Program?
{'answer': 'National Historic Landmark', 'supporting_facts': [['Jeffrey Stanley', 1], ['Yaddo', 0], ['Yaddo', 2]]}