Question: A. Hall and Sons Terra Cotta produce in its kilns the terra cotta for a bulding that has been a National Historic Landmark since what year?
Sentence (from "Woolworth Building"): The original site for the building was purchased by F. W. Woolworth and his real estate agent Edward J. Hogan by April 15, 1910, from the Trenor Luther Park Estate and other owners for $1.65 million.
Relevant evidence: No