Le Bon Marché (Aristide Boucicaut), Paris, France
Le Bon Marché ("the good market", or "the good deal" in French) is the name of one of the most famous department stores in Paris, France. It is sometimes regarded as the first department store in the world. Although this depends on what is meant by 'department store', it may have had the first specially-designed building for a store in Paris. The founder was Aristide Boucicaut.
The store was founded as a small shop in Paris during 1838, and was a fixed-price department store from about 1850. It was a successful business, and a new building was constructed for the store by Louis Auguste Boileau in 1867. Louis Charles Boileau, his son, continued the store in the 1870s, consulting the firm of Gustave Eiffel for parts of its structure. Louis Hippolyte Boileau, the grandson of Louis Auguste, worked on an extension to the store in the 1920s.
See Le Bon Marché official website (only in French).