130 metres long and four stories high, the building was erected between 1753 and 1756 by the architect Laurent Lindet on the site of a farm called "de la Guyarde." There was a central pavilion surmounted by a pediment with a clock from the old royal glass-makers on the fourth level, with two long wings terminating in corner pavilions at each end. In front of the pavilion was a "public" courtyard, enclosed by a wrought iron fence. This front area was decorated twice a month in order to hold parties for visitors.