Once the Hotel de Sens. The building dates from the end of the 15th century was was intended to be the home of wealthy archbishops - starting with Salazar the archbishop of Sens. It took so long to build he never actually lived there and many noblemen used the property over the centuries.
At one stage it was held by the Royal family until it was confiscated during the French Revolution (there’s even a canonball still lodged in the facade - we love these little details).
After that it was neglected and was even used by the Saint James Marmelade Factory of all things. Eventually it was purchased by the City of Paris in 1911 and the last of it’s ad hoc tenants left in 1928. It has had some very famous guests over the centuries including, most famously, Nostradamus. He was invited to Paris by Queen Catherine of the Medicis in 1555 and lodged at the Townhouse of Sens as it was known. The living was fine at the townhouse, so fine he was struck down with an attack of gout and confined to bed, surrounded by people keen to hear his predictions.
The Forney library moved here in 1929 when it outgrew it’s old premises. In its current incarnation of library focussing on decorative arts, it was hosting a fascinating exhibition about feeding Paris - including great photos of our neck of the woods, Les Halles. There was also a lot of memorabilia from restaurants and bistros and great vintage advertising items.