Question: when was the palazzo hotel in las vegas built
[{'answer': '1959', 'provenance': [{'wikipedia_id': '2547979', 'title': 'The Palazzo', 'start_paragraph_id': 7, 'start_character': 48, 'end_paragraph_id': 7, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::History.:Early history.\n'}]}, {'provenance': [{'wikipedia_id': '2547979', 'title': 'The Palazzo', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 450, 'bleu_score': 0.911983636112331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6377328807705940500}, 'section': 'Section::::History.:Early history.\n'}]}]