Located on William Square, it was built between 1830 and 1838 in neo-classical style. The stones of the old Franciscan monastery, dismantled in 1829, mainly went into its construction. In 1931 two bronze lions were added to flank both sides of the outdoor stairs.
The edifice is the seat of the city administration and houses the plenary hall of the municipal council. A little bit further you will find the Luxembourg City Tourist Office.