Question: The cathedral that was the home of the organs Dirk Andries Flentrop restored in 1977 was built in sections between what years? 
Sentence (from "Mexico City Metropolitan Cathedral"): The Metropolitan Cathedral of the Assumption of the Most Blessed Virgin Mary into Heaven (Spanish: "Catedral Metropolitana de la Asunción de la Santísima Virgen María a los cielos" ) is the largest cathedral in the Americas, and seat of the Roman Catholic Archdiocese of Mexico.
Relevant evidence: No