The Carre d'Art, an ultramodern building opposite the Maison Carre, exhibits modern art.
The Carre d'Art is an old, decrepit structure which can be found next door to the Maison Carre. 
mnli hypothesis: The Carre d'Art is an old, decrepit structure which can be found next door to the Maison Carre.  premise: The Carre d'Art, an ultramodern building opposite the Maison Carre, exhibits modern art.