La Fundació Stämpfli is located in the Plaça de l'ajuntament, or the Town Hall Square, and occupies the former areas of the old Fish Market, built in the fifties of the twentieth century as a complement to the Old Market. When the market was closed in the early nineties, this space was allocated to municipal offices.

In 2010, the City of Sitges yields the space to La Fundació to locate two of the three halls of their facilities. The other occupies a floor at Can Mec, the building acquired by Stämpflis for cultural use and allocated to the Grup d'Estudis Sitgetans or Sitges Historical Studies Group.

Reform and adaptation of the old Fish Market was led by the architect Josep Maria Coll, who made a careful work of conservation and restoration of heritage, as well as adaptation of hall for exhibits.

La Fundació Stämpfli acquired another property in carrer d'en Bosch in 2006 -next to Can MEC- which is conceived to extend facilities in the future. This property will allow expanding La Fundació by 1,000 square meters, plus the current surface of 300 of La Fundació.