The principle of planning the market square and the street system of Koscierzyna was based on a layout with a square enclosed by eight streets leading perpendicularly from its corners.
The shape of the market square is similar to that of a square with diagonals running in the directions of the cardinal directions. Currently, the square is surrounded mainly by three-story tenement houses built at the turn of the XIXth and XXth centuries. Among them, the corner tenement house no. 12, built at the beginning of the XXth century, standing at the end of the Gdansk street, deserves special attention.
At the corner of the building there is a polygonal bay window supported by consoles decorated with two characteristic mascarons and palm leaf ornamentation. The whole thing was topped with a helmet ending with a pinnacle. The undoubted peculiarity of the Koscierzyna market square is Remus, the hero of the Kashubian epic, sitting on his wheelbarrow near the gushing fountain. “Żëcé i przigòdë Remùsa” written by Aleksander Majkowski, a native of Kościerzyna, the initiator of the Young Kashubian movement.