Why is this street called « la rue des Lions » anyway? The street was originally just a walking path on the grounds of the royal palace built by the king Charles V in the 1360s and occupied by him and then by his son, the king Charles VI until 1422. Either there were lions painted on the door or gate leading into the property, or the king had a small menagerie/zoo there that included a lion or two.
I thought the house above, on the corner of the Rue des Lions and the Rue Beautreillis, was unusual, and I thought it was older than it turns out to be. According to a real estate web site, it was built in 1800. It contains eight apartments, and the price per square meter for an apartment in the building is about 11,000 euros! A fairly small unit would cost about half a million euros, at that rate.
The Rue des Lions changes names (at least that's how Americans would describe it) and becomes the Rue Jules-Cousin for one block before you arrive at the Boulevard Henri IV and the building occupied by the Garde Républicaine — its headquarters, in fact. It's a unit of the French gendarmerie nationale. Turn left and you arrive at the Place de la Bastille after a short walk up the boulevard, and turn right to get to the Seine and the Ile Saint-Louis.