The district to the north of Ile de la Cite and Ile Saint-Louis has bravely withstood the onslaught of modern construction.
Modern construction is very ugly in all the other districts. 
mnli hypothesis: Modern construction is very ugly in all the other districts.  premise: The district to the north of Ile de la Cite and Ile Saint-Louis has bravely withstood the onslaught of modern construction.