Many historical townhouses have been preserved in the old town, some of which are connected to the Kraków Salt Mines, i.e. the salt mines and salt works in Wieliczka and Bochnia. In various periods, at least twelve of the mansions standing by the Main Market Square of Kraków were homes to dignitaries managing the salt business (żupnik) and officers in the mine (karbariusz, one of them was Iustus Ludovicius Decius).

Bonerowska Mansion (Main Market Square, Rynek Główny 9)

The house belonged to Seweryn Boner, Supervisor of the Kraków Mines, married to Zofia née Betman. In the 16th century it was remodelled in Renaissance style and crowned with a huge nine-metre-high parapet wall (the current one is a reconstruction).

Mansion 'Under the Golden Carp' (Main Market Square, Rynek Główny 10)

This well-heeled house, which had a special position among those owned by the mine establishment, was purchased by the Wieliczka Salt Mine in 1699.

Decius Mansion (ul. św. Jana 3)

The former townhouse of Iustus Ludovicius Decius, where the dignitary used to stay while performing his daily duties as secretary to the king.

Kmitów Mansion (ul. Floriańska 13)

Renaissance ceilings, a column from 1508, and a Gothic-Renaissance fireplace from the 16th century are preserved inside the house.

The Pod Różą Hotel (ul. Floriańska 14)

The house is entered through a 16th-century Renaissance portal, the work of Santi Gucci, flanked with two columns supporting the entablature in an allusion to a triumphal arch and to the gate building of Wawel Castle, designed by Berrecci. The frieze of the portal has retained a Latin motto.