he heart of the city, which is also the center of the historic urban layout of the city center, preserved in an unchanged form since the times of the Teutonic Knights' foundation of the city, is the market square. The principle of the market square layout and the layout of Kościerzyna streets was based on a layout with a square enclosed by eight streets extending perpendicularly from its corners.
The market square is similar in shape to a square with diagonals running in accordance with the directions of the cardinal directions. Currently, the square is mainly surrounded by three-storey tenement houses built at the turn of the 19th and 20th centuries. Among them, the corner tenement house with no. 12, built at the beginning of the 20th century, deserves special attention, standing at the end of Gdańska Street.
At the corner of the building there is a polygonal bay window supported by consoles decorated with two characteristic gargoyles and palm leaf ornamentation. The whole is topped with a cupola topped with a pinnacle. An undoubted curiosity of the Kościerzyna market square is Remus, the hero of the Kashubian epic entitled "Żëcé i przigòdë Remùsa" written by Aleksander Majkowski, a native of Kościerzyna, the initiator of the Young Kashubian movement, sitting on his wheelbarrow near the gushing fountain.