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? 
Sentence (from "Yaddo"): On March 11, 2013 it was designated a National Historic Landmark.
Relevant evidence: Yes