The Place Beauvau is best known for the hôtel de Beauvau, built by the architect Nicolas Le Camus de Mézières around 1770 for the prince, Charles Juste de Beauvau-Craon.
The hôtel de Beauvau has housed the Ministry of the Interior since 1861, and "Place Beauvau" is often used by French news-gathering organizations as shorthand for that Ministry (as, say, one might use "Downing Street" in referring to the British prime minister.)