It is located on Akti Miaouli and it was inside the perimetric wall of the Medieval town and in contact with it. It is the only saved secular building of Knightly period at Kos that was built in 1514 from the Governor (Komentori) of Kos Francesco Sans. Composed by tow arch – covered orthogonal areas. Initially main visage was the westerner (on Mesologgiou street). On Turkish domination the building was used as café and they were two ports opened of the east side (on Akti Miaouli) symmetrical with those of the west side.

The east side’s modulation was made on Italian domination. It was restored by the 4th Inspectorate of Byzantin Antiquities and it is used as archaeological library and as exhibition space. The masonry is trimly well enough with carved stones, anaglyph cornice and premier material in second use. Up and right from the south entrance of the west side is built-in a blazon with the escutcheon of Great Magistro Fabrizio Del Carretto and the blazon of the Governor (Komentori) Francesco Sans, with the date 1514.