This building so easily recognizable, represents 60% of Parisian architecture. In this architecture, nothing is left to chance: the height of the Haussmann buildings is proportional to the width of the street and these buildings cannot initially exceed six floors. Spinning balconies on the second and 5th floors are the norm. The apartments, with parquet floor/moulding/fireplace and maids rooms, welcome during their creation, various social categories, from the grand bourgeois to the house staff.