In the courtyard of Palazzo Pretorio, which once housed the gardens, today there is the Tea House, made by the Japanese artist Hidetoshi Nagasawa. The building is an authentic reproduction of a small japanese house, inside which there are all the objects used for the tea ceremony.

To complete the installation there is an ornamental cherry tree surrounded by seven dark walls, a small stone road that leads to the house and a bamboo plantation; all of this designed to transform the ancient vegetable garden into a japanese tea garden.

The work was donated in 1993 by the sister city of Kanramachi as a symbol of friendship between the two cities as well as japanese philosophy.