Vespucci University School of Law is a fancy institute at the fictional neighborhood of Vespucci Circus, Algonquin, Liberty City. Niko Bellic, the protagonist of GTA IV, attended the School of Law in his younger days.
Niko Bellic couldn't have attended any school in Liberty City as he mentions frequently to his cousin that he is "fresh off the boat" and "new in the country". That could mean Vespucci University School of Law is actually not in Liberty City, contrary to popular belief; it could alternatively mean that Niko lied to Roman about being new in the country. How else would Niko know where everything is in the city straight away?