Question: Which building that became a National Historic Landmark in 1994 is in a district added to the National Register of Historic Places in 1975?
Sentence (from "Ochre Point–Cliffs Historic District"): The district includes a significant subset of the Bellevue Avenue Historic District, a National Historic Landmark District, including all of the major Gilded Age mansions on the waterfront facing Easton Bay between Memorial Boulevard and Marine Avenue.
Relevant evidence: No