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In page French Quarter:

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On the opposite side of the square from the River are three 18th‑century historic buildings, which were the city's heart in the colonial era. The center of the three is St. Louis Cathedral. The cathedral was designated a minor basilica by Pope Paul VI. To its left is the Cabildo, the old city hall, now a museum, where the final transfer papers for the Louisiana Purchase were signed. To the cathedral's right is the Presbytère, built to match the Cabildo. The Presbytère, originally planned to house the city's Roman Catholic priests and authorities, was adapted as a courthouse at the start of the 19th century after the Louisiana Purchase, when civilian government was elevated over church authority. In the 20th century it was adapted as a museum.[citation needed]