In the 15th century, a wooden town hall was built in the center of the square and residential buildings were also constructed.
In 1688 the Baroque Saint Kazimierz Church was built by Dutch architect Tylman van Gameren.
In the second half of the 18th century, wooden residential buildings were replaced by bricked tenement houses.
Then, the buildings on the square were expanded and reconstructed to house growing number of craftsmen and workers.
The image of a girl with a unicorn, old symbol of the New Town, can be found on the top of its eclectic cast-iron pump.