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I didn't know there was more than one building.
Please see the reference for my answer to an almost identical question asked by you previously. There is only one significant building at the site, the cathedral itself. It is among the top five cathedrals in the U.S. in terms of magnificance. It took 93 years to complete. It is the 3rd most popular building for tourism in the U.S., bested only the the Empire State Building and the White House.
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