Ancienne Douane, Renaissance administrative building in Colmar, France.

The Ancienne Douane, or Koïfhus, occupies three adjoining buildings on Grand-Rue. The southern block, the customs house proper, has two main portals crowned with the Empire's double-headed eagle and the city arms; its upper hall has mullioned windows bearing the arms of the Décapole towns. A stone balustrade runs along the glazed-tile roof, and a stone column of 1543 stands before the right-angled staircase.

Built in 1480, the structure originally functioned as a customs house where all imported goods were inspected and controlled. It later became the administrative seat of the Décapole, a federation of ten medieval cities that governed the region.

The building displays characteristic Renaissance motifs such as human masks and fluted pilasters across its facades. These decorative elements give the structure the typical refinement of that artistic period and make it stand out as an example of skilled craftsmanship.

The building is centrally located on Grand'Rue and is easily accessible on foot. Today it houses rotating exhibitions and a restaurant where visitors can take a break.

A column in front of the building's right-angled staircase dates from 1543 and commemorates Charles V's victory over Duke William of Cleves; it originally stood on the Boucherie bridge. The north building, called Ankenhaus, was acquired by the city in 1594 for the tallow and candle trade, and General Jean Rapp was born there in 1771.