Your question is weird because you are talking about a building
and a university.
Sorbonne is the name of a building in the Latin Quarter of
Paris, it was also the nickname of the old University of Paris.
After may 68, the University of Paris was divided in 13
institutions. There are 3 of them that kept "Sorbonne" in their
name, Paris I Pantheon-Sorbonne, Paris 3 Sorbonne Nouvelle and
Paris 4 Paris-Sorbonne. None of them is more "sorbonne" than the
other, although many students like to claim that their university
of paris is more "sorbonne" them all. Funny, huh?